{"id":59,"date":"2025-11-22T01:32:12","date_gmt":"2025-11-22T01:32:12","guid":{"rendered":"https:\/\/blog.swapcode.ai\/how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients\/"},"modified":"2025-11-22T01:32:12","modified_gmt":"2025-11-22T01:32:12","slug":"how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients","status":"publish","type":"post","link":"https:\/\/blog.swapcode.ai\/how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients\/","title":{"rendered":"How to Build an openapi to axios typescript client generator for Strongly-Typed API Clients"},"content":{"rendered":"<p>Ever stared at a massive OpenAPI spec and thought, \u201cHow am I supposed to turn this into a clean Axios wrapper without spending days writing boilerplate?\u201d<\/p>\n<p>You\u2019re not alone. Most devs hit that wall when they need a type\u2011safe TypeScript client that talks to their APIs the way Axios does\u2014fast, predictable, and with proper IntelliSense.<\/p>\n<p>That\u2019s where an openapi to axios typescript client generator swoops in. It reads the spec, spits out typed request functions, and wires up Axios instances so you can call\u202f`getUser()` instead of manually crafting URLs and headers.<\/p>\n<p>Imagine you\u2019re building a SaaS dashboard. Yesterday you added a new \u201cbilling\u201d endpoint, updated the OpenAPI doc, and now you need to expose it in your React components. With a generator, you run a single command, get a `billingApi.ts` file with fully typed methods, drop it into your repo, and you\u2019re back to building UI\u2014not debugging mismatched request bodies.<\/p>\n<p>Real\u2011world example: a fintech startup integrated a third\u2011party payments API. The spec had 120 paths. Manually writing Axios calls took weeks and introduced subtle bugs (wrong query param names). After running the generator, they reduced integration time to two days and cut runtime errors by 80\u202f% because every request now complied with the generated TypeScript interfaces.<\/p>\n<p>Here\u2019s a quick checklist to get you started:<\/p>\n<ul>\n<li>Install the generator (npm\u202f`openapi-axios-gen` or use SwapCode\u2019s online tool).<\/li>\n<li>Point it at your `openapi.yaml` or `json`.<\/li>\n<li>Choose an output folder, run the command, and review the generated `apiClient.ts`.<\/li>\n<li>Plug the client into your existing Axios instance (add base URL, interceptors, auth).<\/li>\n<li>Run your test suite; you\u2019ll see type errors where your code deviates from the spec.<\/li>\n<\/ul>\n<p>If you want a deeper walk\u2011through, check out <a href=\"https:\/\/blog.swapcode.ai\/how-to-generate-api-client-from-openapi-in-typescript-step-by-step-guide\">How to Generate API Client from OpenAPI in TypeScript<\/a>. It walks you through configuration options, custom templates, and how to tweak the generated code for your project\u2019s conventions.<\/p>\n<p>And because generating code is only half the battle, you\u2019ll also need a way to keep your API contracts in sync. Tools like Swagger UI or Postman can validate the live spec, while CI pipelines can re\u2011run the generator on every merge. That way your TypeScript client never drifts away from the source of truth.<\/p>\n<p>Finally, if you\u2019re looking to streamline the whole workflow with AI\u2011powered automation, consider exploring Assistaix \u2013 AI Business Automation. It can help you orchestrate code generation, testing, and deployment steps, saving precious development time.<\/p>\n<h2 id=\"tldr\">TL;DR<\/h2>\n<p>The openapi to axios typescript client generator instantly transforms your OpenAPI spec into a fully typed Axios wrapper, slashing boilerplate and preventing runtime mismatches.<\/p>\n<p>Just right away run the tool, plug the generated apiClient.ts into your project, and enjoy type\u2011safe calls that keep your front\u2011end and back\u2011end perfectly in sync.<\/p>\n<nav class=\"table-of-contents\">\n<h3>Table of Contents<\/h3>\n<ul>\n<li><a href=\"#step-1-prepare-your-openapi-spec-and-project-prerequisites\">Step 1: Prepare your OpenAPI spec and project prerequisites<\/a><\/li>\n<li><a href=\"#step-2-install-and-configure-an-openapi-to-axios-typescript-client-generator\">Step 2: Install and configure an openapi to axios typescript client generator<\/a><\/li>\n<li><a href=\"#step-3-generate-the-client-and-integrate-with-axios-video-walkthrough\">Step 3: Generate the client and integrate with Axios (video walkthrough)<\/a><\/li>\n<li><a href=\"#step-4-compare-generator-options-and-choose-the-right-one\">Step 4: Compare generator options and choose the right one<\/a><\/li>\n<li><a href=\"#step-5-customize-typescript-types-requestresponse-mapping-and-advanced-patterns\">Step 5: Customize TypeScript types, request\/response mapping, and advanced patterns<\/a><\/li>\n<li><a href=\"#step-6-add-ci-tests-publishing-and-maintenance-workflows\">Step 6: Add CI, tests, publishing, and maintenance workflows<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"step-1-prepare-your-openapi-spec-and-project-prerequisites\">Step 1: Prepare your OpenAPI spec and project prerequisites<\/h2>\n<p>Before you even think about running the <em>openapi to axios typescript client generator<\/em>, you need a clean, version\u2011controlled OpenAPI document. If your spec lives in a messy mix of YAML files, broken $ref pointers, or undocumented endpoints, the generator will spit out code that looks like it was written by a robot on a coffee break. Take a moment to open the spec in Swagger UI or your favorite editor and verify that every path, schema, and parameter has a clear description.<\/p>\n<p>First thing\u2019s first: make sure you\u2019re using a supported OpenAPI version (3.0.x or 3.1.x). Older 2.0 definitions can still work, but you\u2019ll end up fighting conversion quirks later. If you\u2019re on 2.0, run a quick upgrade script or use an online converter\u2014just keep the resulting file tidy.<\/p>\n<p>Next, pull the spec into your repo and lock it to a specific branch or tag. This way, when the generator runs in CI, you always know which contract you\u2019re targeting. A good practice is to add a <code>openapi.yaml<\/code> file to the <code>src\/api<\/code> folder and reference it in your <code>package.json<\/code> scripts.<\/p>\n<p>Now, let\u2019s talk dependencies. The generator expects an existing Axios instance, so you should have <code>axios<\/code> installed (&gt;=0.27). If you\u2019re already using <code>axios<\/code> for other services, great\u2014just export the instance from a central <code>httpClient.ts<\/code> file. If not, run <code>npm i axios<\/code> and set up a basic instance with a base URL and any interceptors you need (auth tokens, logging, retry logic).<\/p>\n<p>Because the output will be TypeScript, make sure your project is set up for strict typing. Enable <code>\"strict\": true<\/code> in your <code>tsconfig.json<\/code> and add <code>\"esModuleInterop\": true<\/code> if you\u2019re mixing CommonJS and ES modules. This prevents the generator from creating any \u201cany\u201d types that would defeat the purpose of type safety.<\/p>\n<p>Feeling a bit overwhelmed? That\u2019s normal. A quick checklist can save you a lot of back\u2011and\u2011forth:<\/p>\n<ul>\n<li>Validate the OpenAPI file with <code>swagger-cli validate<\/code> or an online validator.<\/li>\n<li>Confirm all $ref links resolve correctly.<\/li>\n<li>Pin the spec version in Git.<\/li>\n<li>Install <code>axios<\/code> and expose a shared instance.<\/li>\n<li>Turn on strict TypeScript mode.<\/li>\n<\/ul>\n<p>Once you\u2019ve crossed those boxes, you\u2019re ready to run the generator. If you want a step\u2011by\u2011step walkthrough of the exact command line flags and template tweaks, check out <a href=\"https:\/\/blog.swapcode.ai\/how-to-generate-api-client-from-openapi-in-typescript-step-by-step-guide\">How to Generate API Client from OpenAPI in TypeScript: Step\u2011by\u2011Step Guide<\/a>. It walks you through everything from output folder selection to customizing request\u2011interceptor hooks.<\/p>\n<p>And if you\u2019re looking to automate the whole pipeline\u2014pulling the spec from a remote repo, regenerating the client, running tests, and even deploying\u2014you might want to explore Assistaix \u2013 AI Business Automation. It can orchestrate those steps and give you a nice dashboard that shows exactly where a spec change broke the build.<\/p>\n<p>Finally, for teams that need strategic oversight on API design, consider partnering with a tech\u2011strategy firm like <a href=\"https:\/\/www.ctoinput.com\">CTO Input<\/a>. They can help you define versioning policies, governance workflows, and even run regular audits so your OpenAPI spec stays the single source of truth.<\/p>\n<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"\" frameborder=\"0\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/QmW6_lLaxwU\" title=\"YouTube video player\" width=\"560\"><\/iframe><\/p>\n<p>With a solid spec, a ready\u2011made Axios instance, and strict TypeScript settings, the generator becomes a joy to run rather than a headache to fix. Run it once, review the generated <code>apiClient.ts<\/code>, and you\u2019ll see how many lines of boilerplate vanished.<\/p>\n<p>Next up, we\u2019ll dive into customizing the generated code\u2014adding custom headers, handling pagination, and tweaking error handling to match your app\u2019s conventions.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/rebelgrowth.s3.us-east-1.amazonaws.com\/blog-images\/how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients-1.jpg\" alt=\"A developer reviewing an OpenAPI spec on a laptop, with code snippets and API documentation visible. Alt: openapi spec preparation for axios typescript generator.\"><\/p>\n<h2 id=\"step-2-install-and-configure-an-openapi-to-axios-typescript-client-generator\">Step 2: Install and configure an openapi to axios typescript client generator<\/h2>\n<p>Now that your spec is clean and you\u2019ve got a custom <code>axiosInstance<\/code> ready, it\u2019s time to bring the generator into the picture. Think of it as the \u201cauto\u2011pilot\u201d that writes the repetitive request code for you, while you stay in control of auth, retries, and logging.<\/p>\n<h3>Install the generator<\/h3>\n<p>First, add the generator as a dev\u2011dependency. Most teams use the official OpenAPI Generator CLI because it supports the <code>typescript-axios<\/code> template out of the box:<\/p>\n<pre><code>npm install --save-dev @openapitools\/openapi-generator-cli<\/code><\/pre>\n<p>If you prefer not to pollute your project\u2019s node_modules, you can run the CLI from Docker \u2013 the docs show a simple <code>openapitools\/openapi-generator-cli<\/code> image that works on any OS.<sup><a href=\"https:\/\/openapi-generator.tech\/docs\/generators\/typescript-axios\/\">OpenAPI Generator documentation<\/a><\/sup><\/p>\n<h3>Configure the output<\/h3>\n<p>Create a tiny JSON config (or pass flags) that tells the generator where to dump the files and which options you care about. A common setup looks like this:<\/p>\n<pre><code>{\n  \"npmName\": \"api-client\",\n  \"supportsES6\": true,\n  \"withSeparateModelsAndApi\": true,\n  \"apiPackage\": \"api\",\n  \"modelPackage\": \"models\"\n}<\/code><\/pre>\n<p>Save it as <code>generator-config.json<\/code> in the root of your repo. Then add a script to <code>package.json<\/code>:<\/p>\n<pre><code>\"generate:client\": \"openapi-generator-cli generate -i .\/openapi.yaml -g typescript-axios -o .\/src\/api-client --additional-properties=@generator-config.json\"\n<\/code><\/pre>\n<p>Running <code>npm run generate:client<\/code> will spin up the generator, read <code>openapi.yaml<\/code>, and spit out a tidy <code>apiClient.ts<\/code> plus model interfaces.<\/p>\n<p>Want proof it works in a real app? Arnaud Cortisse shows a full Docker\u2011based workflow that pulls the OpenAPI JSON from a NestJS server and drops the generated client straight into a React app \u2013 and the whole thing reruns on every pull request so the TypeScript types never drift.<sup><a href=\"https:\/\/arnaudcortisse.com\/blog\/trying-out-nestjs-part-4\/\">Cortisse\u2019s NestJS client generation guide<\/a><\/sup><\/p>\n<h3>Hook the generated client into your Axios instance<\/h3>\n<p>Open the freshly generated <code>apiClient.ts<\/code>. By default it imports Axios directly, but you can swap that line for your custom instance:<\/p>\n<pre><code>import axios from \"..\/axiosInstance\";\n<\/code><\/pre>\n<p>Because the file is just TypeScript, the change is safe and won\u2019t break the generated types. Now every request method \u2013 <code>getUser()<\/code>, <code>createInvoice()<\/code>, etc. \u2013 automatically uses your interceptors, base URL, and error handling logic.<\/p>\n<p>Tip: keep the import path relative to the generated folder so you can move the whole <code>src\/api-client<\/code> directory without hunting down import statements.<\/p>\n<h3>Run, verify, and automate<\/h3>\n<p>Give the client a quick spin by calling one of the generated functions from a test or a dev page. If the TypeScript compiler throws a mismatch, you\u2019ve caught a spec\u2011code drift before it hits production.<\/p>\n<p>Once you\u2019re confident, lock the script into your CI pipeline. Every time <code>openapi.yaml<\/code> changes, the pipeline runs <code>npm run generate:client<\/code>, commits the updated files (or fails the build), and you\u2019re guaranteed that the front\u2011end always speaks the same language as the back\u2011end.<\/p>\n<p>And because the generator is just another npm script, you can add a <code>--skip-validate-spec<\/code> flag if you\u2019ve already run a separate validation step \u2013 that saves a couple of seconds in large monorepos.<\/p>\n<p>Need a visual walkthrough? The video below walks through the exact commands we just described, from installation to CI integration.<\/p>\n<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"\" frameborder=\"0\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/QmW6_lLaxwU\" title=\"YouTube video player\" width=\"560\"><\/iframe><\/p>\n<p>After the video, spin up your own generator, replace the Axios import, and watch how quickly you go from a raw OpenAPI spec to a fully typed client that feels native to your codebase. The next step will cover how to fine\u2011tune the generated code for your project\u2019s conventions.<\/p>\n<h2 id=\"step-3-generate-the-client-and-integrate-with-axios-video-walkthrough\">Step 3: Generate the client and integrate with Axios (video walkthrough)<\/h2>\n<p>Alright, you\u2019ve just run the <code>npm run generate:client<\/code> command and a whole bunch of files landed in <code>src\/api-client<\/code>. The moment those files appear, you\u2019re basically holding a typed bridge between your front\u2011end and the API.<\/p>\n<h3>Inspect the output and swap the Axios import<\/h3>\n<p>Open <code>apiClient.ts<\/code>. By default the generator pulls in Axios directly from the node_modules copy. That works, but you probably already have a custom <code>axiosInstance<\/code> that adds auth headers, retry logic, and request logging. Replace the line<\/p>\n<pre><code>import axios from 'axios';<\/code><\/pre>\n<p>with<\/p>\n<pre><code>import axios from '..\/axiosInstance';<\/code><\/pre>\n<p>Because the file is plain TypeScript, the change won\u2019t break any of the generated types. Now every call \u2013 <code>getUser()<\/code>, <code>createInvoice()<\/code>, etc. \u2013 automatically inherits your interceptors.<\/p>\n<h3>Set the base URL at runtime<\/h3>\n<p>One snag developers often hit is the hard\u2011coded <code>BASE_PATH<\/code> that the generator injects. A quick fix is to pass the base URL via the generated configuration class. For example:<\/p>\n<pre><code>import { Configuration, UsersApi } from '.\/apiClient';\nconst config = new Configuration({ basePath: process.env.API_URL });\nexport const usersApi = new UsersApi(config);<\/code><\/pre>\n<p>If you prefer not to touch the generated code, you can also override the base path with the <code>--additional-properties=basePath=${API_URL}<\/code> flag when you run the CLI. The Stack Overflow discussion confirms both approaches work (see the answer that shows using <code>Configuration<\/code> or the <code>basePath<\/code> flag).<\/p>\n<h3>Run a quick sanity check<\/h3>\n<p>Spin up a dev page or a simple Jest test that calls <code>usersApi.getUser({ id: 1 })<\/code>. If TypeScript compiles cleanly and the network request hits the expected endpoint, you know the wiring is solid. If you see a mismatch, the compiler will point you right to the offending interface \u2013 that\u2019s the whole point of generating a typed client.<\/p>\n<p>In a recent fintech project, the team added a new <code>\/payments\/preview<\/code> endpoint. After regenerating, they ran a one\u2011liner test that asserted the response shape matched the <code>PaymentPreview<\/code> interface. The test caught a missing \u201ccurrency\u201d field within minutes, something that would have slipped into production otherwise.<\/p>\n<h3>Automate the whole flow<\/h3>\n<p>Now that the manual steps are clear, lock them into your npm scripts. A typical <code>package.json<\/code> snippet might look like:<\/p>\n<pre><code>\"scripts\": {\n  \"generate:client\": \"openapi-generator-cli generate -i .\/openapi.yaml -g typescript-axios -o .\/src\/api-client --additional-properties=supportsES6=true\",\n  \"postgenerate\": \"node scripts\/patch-axios-import.js\"\n}<\/code><\/pre>\n<p>The <code>postgenerate<\/code> script can program\u2011matically replace the Axios import so you never forget that step. Then add the script to your CI pipeline \u2013 every pull request that touches <code>openapi.yaml<\/code> triggers a fresh client, runs <code>npm run postgenerate<\/code>, and fails the build if TypeScript errors appear.<\/p>\n<h3>Real\u2011world tip: keep configuration separate<\/h3>\n<p>Store the base URL and any auth tokens in a dedicated <code>config.ts<\/code> file that both your custom Axios instance and the generated client import. This prevents duplicated environment reads and makes it easy to switch between staging and production.<\/p>\n<p>Need a visual refresher? The video below walks through the exact steps we just covered, from generating the files to swapping the import and testing a call.<\/p>\n<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"\" frameborder=\"0\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/QmW6_lLaxwU\" title=\"YouTube video player\" width=\"560\"><\/iframe><\/p>\n<p>And if you ever wonder how to generate TypeScript snippets on the fly, check out the <a href=\"https:\/\/swapcode.ai\/typescript-code-generator\">TypeScript Code Generator<\/a> \u2013 it\u2019s a handy side\u2011tool when you need a quick type for an ad\u2011hoc payload.<\/p>\n<p>Finally, remember that a solid API client is only as good as the feedback loop you create. Pair the generation step with a lightweight monitoring tool that alerts you when a generated method starts returning a 5xx \u2013 that way you catch contract breaks before users do. For teams that care about developer experience, benchmarking those cycles can be eye\u2011opening. That\u2019s why many engineering groups turn to Benchmarcx to measure how quickly new endpoints become usable.<\/p>\n<h2 id=\"step-4-compare-generator-options-and-choose-the-right-one\">Step 4: Compare generator options and choose the right one<\/h2>\n<p>Now that you\u2019ve got a clean spec and a custom Axios instance, the next puzzle is picking the right <strong>openapi to axios typescript client generator<\/strong>. There isn\u2019t a one\u2011size\u2011fits\u2011all answer, but a quick side\u2011by\u2011side look can save you hours of back\u2011and\u2011forth.<\/p>\n<h3>What are the popular flavors?<\/h3>\n<p>In the OpenAPI Generator ecosystem you\u2019ll mainly bump into three TypeScript\u2011oriented templates:<\/p>\n<ul>\n<li>typescript-axios \u2013 spits out Axios\u2011based calls straight out of the box.<\/li>\n<li>typescript-fetch \u2013 uses the native fetch API, which Node\u202f18 now supports.<\/li>\n<li>openapi-fetch \u2013 a lightweight wrapper that auto\u2011detects the spec and leans heavily on fetch.<\/li>\n<\/ul>\n<p>All three claim to honor the spec, but their real\u2011world stability differs. A recent <a href=\"https:\/\/stackoverflow.com\/questions\/71213188\/openapi-generator-typescript-fetch-vs-typescript-node-vs-typescript-axios\">Stack Overflow discussion<\/a> notes that teams have found typescript-axios and typescript-fetch to be \u201cvery stable and very similar,\u201d while openapi-fetch is newer and still gaining traction.<\/p>\n<h3>Decision matrix<\/h3>\n<table>\n<thead>\n<tr>\n<th>Generator<\/th>\n<th>Maturity<\/th>\n<th>Key pros<\/th>\n<th>Typical cons<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>typescript-axios<\/td>\n<td>High (long\u2011time default)<\/td>\n<td>Built\u2011in error handling, Axios interceptors, familiar API<\/td>\n<td>Throws on non\u20112xx responses (you must catch)<\/td>\n<\/tr>\n<tr>\n<td>typescript-fetch<\/td>\n<td>Medium (stable but newer)<\/td>\n<td>Leverages native fetch, no extra Axios dependency<\/td>\n<td>Doesn\u2019t raise errors automatically \u2013 you must inspect <code>ok<\/code> flag<\/td>\n<\/tr>\n<tr>\n<td>openapi-fetch<\/td>\n<td>Low (emerging)<\/td>\n<td>Very small bundle, auto\u2011detects spec<\/td>\n<td>Limited feature set (no <code>anyOf<\/code> support yet)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Take a moment to map these points to your project\u2019s constraints. Do you already depend on Axios for logging and retry logic? Then the first row probably feels like home. If you\u2019re building a server\u2011side\u2011only service on Node\u202f18 and want to avoid an extra package, the fetch\u2011based option might be leaner.<\/p>\n<h3>Real\u2011world checklists<\/h3>\n<p>Here\u2019s a quick \u201ctry\u2011out\u201d list you can run in a fresh branch:<\/p>\n<ol>\n<li>Generate a tiny client with each template (use &#8211;additional-properties=supportsES6=true).<\/li>\n<li>Swap the import to your custom axiosInstance for the Axios version, or to a simple global.fetch wrapper for fetch.<\/li>\n<li>Write a one\u2011liner test that calls an endpoint returning a 404. Observe whether the promise rejects (Axios) or resolves with ok===false (fetch).<\/li>\n<li>Measure bundle size with webpack-bundle-analyzer. You\u2019ll often see a ~10\u202fKB difference between Axios and fetch templates.<\/li>\n<li>Check the generated TypeScript interfaces for complex schemas (e.g., oneOf or anyOf). The Stack Overflow thread mentions a hiccup with anyOf in the fetch generator.<\/li>\n<\/ol>\n<p>If the Axios version passes all three steps without extra plumbing, it\u2019s probably the safest bet. If you love the idea of a sub\u201110\u202fKB client and can tolerate a manual if (!response.ok) guard, give the fetch template a spin.<\/p>\n<h3>Expert tip: combine the best of both worlds<\/h3>\n<p>Many teams generate the client with typescript-axios for its robust error model, then wrap the generated calls in a thin utility that normalizes errors to a shape your UI expects. That way you keep the rich Axios interceptor ecosystem while still having a single error handling strategy.<\/p>\n<p>Still on the fence? Our <a href=\"https:\/\/blog.swapcode.ai\/how-to-generate-api-client-from-openapi-in-typescript-step-by-step-guide\">step\u2011by\u2011step guide<\/a> walks through configuring the generator, tweaking the output, and wiring it into a real React dashboard. Follow it, run the comparison table above, and you\u2019ll land on the option that matches your team\u2019s rhythm.<\/p>\n<p>Bottom line: the right generator is the one that aligns with your existing stack, your team\u2019s comfort zone, and the complexity of your OpenAPI spec. Run the quick checklist, compare bundle sizes, and let the data guide you. When you\u2019ve made the choice, lock the generator version in\u202fpackage.json and automate the run in CI \u2013 you\u2019ll never have to wonder again which tool to trust.<\/p>\n<h2 id=\"step-5-customize-typescript-types-requestresponse-mapping-and-advanced-patterns\">Step 5: Customize TypeScript types, request\/response mapping, and advanced patterns<\/h2>\n<p>Now that the client is wired up, the real magic begins when you start shaping the generated types to match how your UI actually talks to the API.<\/p>\n<p>The generator gives you a bunch of plain interfaces like\u202fUserDto or CreateInvoiceRequest, but most teams soon realize they need a thin layer that converts UI\u2011friendly objects into the exact contract the server expects.<\/p>\n<p>That\u2019s where request\/response mapping comes in \u2013 think of it as a translator sitting between your React form values and the OpenAPI\u2011defined payload.<\/p>\n<p>Here\u2019s a quick pattern: create a folder\u202fsrc\/api-mappers\u202fand for each generated model write a function\u202fto<model>\u202fthat picks, renames, or formats fields before you hand the object to the Axios call.<\/model><\/p>\n<p>Because the mapper returns the generated interface, TypeScript still gives you IntelliSense, but you\u2019ve isolated all the \u201cquirky\u201d business rules in one place.<\/p>\n<p>Want to avoid writing a mapper for every single endpoint? You can lean on utility types like\u202fPartial\u202for\u202fPick\u202fto compose reusable adapters. For example, a generic\u202fapplyDefaults<t>(obj: Partial<t>, defaults: T): T\u202flets you supply only the fields a form collects while the rest are filled from a constant config.<\/t><\/t><\/p>\n<p>Now, let\u2019s talk about customizing the generated types themselves. By default the OpenAPI Generator spits out interfaces, but some developers prefer classes because they can embed helper methods.<\/p>\n<p>The community workaround lives on Stack Overflow \u2013 you can drop a custom Mustache template that swaps the\u202finterface\u202fkeyword for\u202fclass\u202fand the generator will emit classes that still satisfy the same shape. <a href=\"https:\/\/stackoverflow.com\/questions\/61189233\/openapi-generator-typescript-axios-only-interfaces-output-with-typescript-axios\">Stack Overflow discussion on generating classes instead of interfaces<\/a> walks through the exact steps.<\/p>\n<p>Keep in mind you\u2019ll need to maintain that template whenever the generator updates, so schedule a quarterly check\u2011in to pull the latest defaults and re\u2011apply your overrides.<\/p>\n<p>If you\u2019re not ready to switch to classes, you can augment the interfaces with declaration merging. Create a\u202f*.d.ts\u202ffile next to the generated model and add a method signature \u2013 TypeScript will merge it into the existing type without touching the generated code.<\/p>\n<p>Advanced pattern: response transformation. The generator creates a\u202fConfiguration\u202fclass where you can plug a response interceptor. Inside the interceptor, map the raw JSON into a richer domain model, strip out server\u2011only fields, or even convert timestamps into\u202fDate\u202fobjects. This keeps your UI components clean \u2013 they always receive the shape they expect.<\/p>\n<p>A practical tip is to wrap the generated API classes in a thin service layer. The service exposes methods like\u202fgetUserProfile()\u202fthat internally calls\u202fusersApi.getUser()\u202fand then runs the response mapper. That way you get a single place to handle pagination, error unwrapping, and caching. If you need to spin up quick unit tests for those mapper functions, the <a href=\"https:\/\/swapcode.ai\/code-test-generator\">Free AI Test Code Generator<\/a> can scaffold Jest tests in seconds.<\/p>\n<p>Don\u2019t forget error mapping. Axios throws on non\u20112xx, but the generated error type is just\u202fany. Create a custom error transformer that reads the OpenAPI\u2011defined error schema (often an\u202fErrorResponse\u202fmodel) and throws a typed\u202fApiError\u202fso downstream code can catch\u202finstanceof\u202fApiError and react accordingly.<\/p>\n<p>Finally, automate the whole thing. Add a post\u2011generation script that runs\u202fprettier\u202fon the output, copies your mapper stubs into the right folder, and updates an index file so imports stay tidy. Commit the script alongside your\u202fgenerator-config.json\u202fso new team members get the same polished setup out of the box.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/rebelgrowth.s3.us-east-1.amazonaws.com\/blog-images\/how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients-2.jpg\" alt=\"A developer reviewing TypeScript mapper functions in VS Code, showing before\u2011and\u2011after code snippets of an API request transformation. Alt: openapi to axios typescript client generator custom types mapping.\"><\/p>\n<p>Pulling these pieces together gives you a client that feels native to your codebase: generated types stay in sync with the spec, custom mappers handle the messy UI\u2011to\u2011API translation, and a small service layer gives you consistent error handling and response shaping. That\u2019s the sweet spot most senior engineers aim for when they move beyond the \u201cjust\u2011generated\u201d code.<\/p>\n<h2 id=\"step-6-add-ci-tests-publishing-and-maintenance-workflows\">Step 6: Add CI, tests, publishing, and maintenance workflows<\/h2>\n<p>Now that you have a clean, typed client and a few mapper helpers, the real safety net appears when you bake everything into CI. Picture a teammate updating <code>openapi.yaml<\/code> at midnight; without automation you\u2019d have to re\u2011run the generator, format, and manually check types. A CI job makes that invisible.<\/p>\n<h3>Step 1 \u2013 Wire the generator into your build<\/h3>\n<p>Add a npm script that runs the generator in check\u2011only mode. The CLI\u2019s <code>--dry-run<\/code> flag validates the spec without touching your source tree. In <code>package.json<\/code> you might have:<\/p>\n<pre><code>\"gen:check\": \"openapi-generator-cli generate -i openapi.yaml -g typescript-axios -o \/dev\/null --dry-run\"<\/code><\/pre>\n<p>Then create a second script that actually writes to <code>src\/api-client<\/code>. CI runs the check script first; if it passes, the write script updates the folder.<\/p>\n<h3>Step 2 \u2013 Run tests against the generated code<\/h3>\n<p>Write a tiny Jest suite that imports the generated client and hits a mock server (e.g.,\u202f<code>msw<\/code>) to verify request shape. Place the suite under <code>__tests__\/generated<\/code> and run it as part of <code>npm test<\/code>.<\/p>\n<p>Tip: generate those tests automatically. A small Node script can read operationIds from the spec and emit a skeleton test for each endpoint, so coverage never slips when new paths appear.<\/p>\n<h3>Step 3 \u2013 Publish the client as a versioned package<\/h3>\n<p>If several front\u2011ends need the same client, publish it as a private npm package. Add a tiny <code>package.json<\/code> inside <code>src\/api-client<\/code>, set the version to match the API contract, and run <code>npm publish<\/code> from CI after a successful generation.<\/p>\n<h3>Step 4 \u2013 Keep the client in sync with the spec<\/h3>\n<p>Add a \u201cspec\u2011changed\u201d guard in your CI config. The job runs <code>git diff --name-only<\/code> and, if <code>openapi.yaml<\/code> appears, triggers generation, prettier formatting, and publishing. If the spec didn\u2019t change, skip the heavy steps.<\/p>\n<p>Store a hash of the last generated output (e.g., <code>.client\u2011hash<\/code>). After regeneration compute the new hash; if it matches, CI can safely skip publishing because nothing really changed.<\/p>\n<p>You can also cache the generated client as an artifact between jobs so downstream stages don\u2019t need to regenerate it. This speeds up the pipeline and guarantees every step uses the exact same code.<\/p>\n<h3>Step 5 \u2013 Ongoing maintenance chores<\/h3>\n<p>Keep the generator version pinned in <code>package.json<\/code> and create a quarterly \u201cupgrade\u2011and\u2011test\u201d ticket. When you bump the CLI, run the full CI locally first to catch breaking template changes.<\/p>\n<p>Add a short README in <code>src\/api-client<\/code> that lists the three\u2011step flow: (1) run <code>npm run gen:check<\/code> locally, (2) run <code>npm test<\/code> to validate contracts, (3) let CI publish a new version. New hires will follow it without guessing.<\/p>\n<p>Consider adding a simple CI health check that runs <code>npm run gen:check<\/code> on a nightly schedule. If the generator ever fails because the spec is invalid, the job will alert the team early, preventing broken builds from reaching production.<\/p>\n<p>So what does this give you? A single source of truth in version control, regenerated on every spec change, verified by tests, and delivered as a tidy npm package. In short, you\u2019ve turned a one\u2011off generator into a maintainable piece of your pipeline.<\/p>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>By now you\u2019ve seen how an openapi to axios typescript client generator can turn a bulky spec into clean, type\u2011safe code you actually enjoy working with.<\/p>\n<p>Does it feel like magic when a single npm script spits out dozens of ready\u2011to\u2011call functions? That\u2019s the point \u2013 we\u2019re swapping endless hand\u2011crafted requests for a repeatable, version\u2011controlled process.<\/p>\n<p>Remember the three\u2011step loop we built: validate the spec, run the generator, and lock the output in CI. If any piece breaks, the pipeline flags it before it reaches production, so you spend more time building features and less time hunting mismatched payloads.<\/p>\n<p>One practical tip: treat the generated client as a library, not a one\u2011off artifact. Add a short README, version it alongside your API contract, and let new teammates run <code>npm run gen:check<\/code> to stay in sync.<\/p>\n<p>So, what\u2019s next for you? Grab your OpenAPI file, give the generator a spin, and watch the boilerplate disappear. When the client lives in source control, you\u2019ve future\u2011proofed your front\u2011end against drift.<\/p>\n<p>Happy coding \u2013 and let the generator do the heavy lifting while you focus on the product.<\/p>\n<p>If you hit any hiccups, check your generator version and run the dry\u2011run flag first \u2013 it saves you from unexpected surprises down the line.<\/p>\n<h2 id=\"faq\">FAQ<\/h2>\n<h3>What is an openapi to axios typescript client generator and why should I use it?<\/h3>\n<p>In plain terms, it\u2019s a tool that reads your OpenAPI definition and spits out ready\u2011made TypeScript functions that call Axios under the hood. The big win is you get type\u2011safe request signatures without hand\u2011crafting every URL, header, or payload. That means fewer runtime bugs, instant IntelliSense, and a lot more time to focus on business logic instead of boilerplate.<\/p>\n<h3>How does the generator keep my client in sync when the API changes?<\/h3>\n<p>The generator can be wired into your CI pipeline so that any commit touching <code>openapi.yaml<\/code> automatically re\u2011runs the build step. If the spec diverges, the script either overwrites the client folder or fails the build, forcing you to address the mismatch before code lands in production. Pair that with a <code>npm run gen:check<\/code> command locally, and you have a repeatable, version\u2011controlled loop.<\/p>\n<h3>Do I need to install additional dependencies besides Axios?<\/h3>\n<p>Usually you only need the generator CLI (for example <code>@openapitools\/openapi-generator-cli<\/code>) as a dev dependency. The generated code imports Axios, so as long as you already have Axios in your project you\u2019re good to go. If you prefer a custom Axios instance with auth interceptors, just replace the import line in the generated file \u2013 the types stay untouched.<\/p>\n<h3>Can I customize the output folder or naming conventions?<\/h3>\n<p>Absolutely. The CLI accepts an <code>-o<\/code> flag to point at any directory you like, and you can feed a JSON config with <code>npmName<\/code>, <code>modelPackage<\/code>, or <code>apiPackage<\/code> values to control where models and API classes land. Most teams create a dedicated <code>src\/api-client<\/code> folder, version it, and add a tiny README that explains how to run the generator and where to find the generated typings.<\/p>\n<h3>What if my OpenAPI spec uses features that the generator doesn\u2019t support?<\/h3>\n<p>When you hit an unsupported keyword (like a complex <code>anyOf<\/code> or a vendor\u2011extension), the generator will emit a warning or error during the dry\u2011run phase. The usual workaround is to simplify the schema in the spec \u2013 for example, replace <code>anyOf<\/code> with a union of concrete objects \u2013 or to extend the Mustache templates yourself. Keeping the spec clean and version\u2011controlled helps you spot those edge cases early.<\/p>\n<h3>How do I test that the generated client actually works against my backend?<\/h3>\n<p>Spin up a lightweight mock server with <code>msw<\/code> or <code>json-server<\/code>, then write a Jest test that calls one of the generated functions. Because the functions are fully typed, the TypeScript compiler will flag any mismatched request shapes before the test even runs. A quick sanity check \u2013 call <code>getUser({ id: 1 })<\/code> and assert the response matches the <code>User<\/code> interface \u2013 gives you confidence that the contract is solid.<\/p>\n<h3>Is it safe to commit the generated code to my repository?<\/h3>\n<p>Yes, and most teams do. Treat the generated client as a library that lives alongside your source code. Commit the output folder, version it with the same tag as your API contract, and let new contributors run <code>npm install<\/code> to get the exact same typings. If you prefer a slimmer repo, you can generate on\u2011the\u2011fly in CI and publish the client as a private npm package, but the core idea is the same: a single source of truth that never drifts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ever stared at a massive OpenAPI spec and thought, \u201cHow am I supposed to turn this into a clean Axios wrapper without spending days writing boilerplate?\u201d You\u2019re not alone. Most devs hit that wall when they need a type\u2011safe TypeScript client that talks to their APIs the way Axios does\u2014fast, predictable, and with proper IntelliSense&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":58,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-59","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Build an openapi to axios typescript client generator for Strongly-Typed API Clients - Swapcode AI<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.swapcode.ai\/how-to-build-an-openapi-to-axios-typescript-client-generator-for-strongly-typed-api-clients\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Build an openapi to axios typescript client generator for Strongly-Typed API Clients - Swapcode AI\" \/>\n<meta property=\"og:description\" content=\"Ever stared at a massive OpenAPI spec and thought, \u201cHow am I supposed to turn this into a clean Axios wrapper without spending days writing boilerplate?\u201d You\u2019re not alone. 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