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String to JSON Converter (Free AI Tool)
Convert strings to JSON with automatic character escaping and validation. Parse URL query strings, serialized data, and text into valid JSON objects. Client-side processing keeps your data secure.
Paste code in both editors to see differences
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Hint: Select conversion type, paste your data, and get instant conversion. Supports JSON, YAML, XML, Excel, PDF, and more.
How It Works
- 1
Paste String with Special Characters
Paste your text string including quotes, newlines, backslashes, or URL query strings like ?key=value&key2=value2 that need proper JSON encoding.
- 2
AI Escapes Characters and Validates
The tool escapes special characters (quotes become \", newlines become \n), wraps strings in double quotes, and validates syntax against JSON specification.
- 3
Copy Valid JSON Output
Receive validated JSON ready for JavaScript JSON.parse(), Python json.loads(), or API POST request bodies.
String vs JSON: Format Comparison
| Feature | String | JSON |
|---|---|---|
| Format | Plain text | Structured JSON |
| Quotes | Optional or mixed | Double quotes required |
| Escaping | Raw characters | Escaped special chars |
| Structure | Unstructured | Key-value pairs |
| Use Case | Human readable | Machine parseable |
| Validation | None | Syntax validation |
Code Examples
Example 1: Simple String with Quotes
Hello "World" with 'quotes' and
newline{
"text": "Hello \"World\" with 'quotes' and\nnewline"
}Key Changes:
Double quotes within the string are escaped to prevent JSON syntax errors. The newline character becomes an escape sequence. Single quotes do not need escaping in JSON strings. The entire string is wrapped in double quotes as JSON spec requires. This output can be parsed by JavaScript JSON.parse() or any JSON parser without errors.
Example 2: URL Query String to JSON Object
?name=John%20Doe&age=30&city=New%20York&active=true{
"name": "John Doe",
"age": "30",
"city": "New York",
"active": "true"
}Key Changes:
URL query string parameters (key=value pairs separated by &) convert to JSON object properties. URL encoding (%20 for space) is decoded to normal characters. Each parameter becomes a key-value pair with proper JSON string formatting. While values are strings, you can parse them later (parseInt for numbers, JSON.parse for booleans). This format is useful for converting GET request parameters to POST request JSON bodies in API development.
Frequently Asked Questions
Special characters in strings are escaped for JSON compatibility. Quotes become \", backslashes become \\, newlines become \n, tabs become \t. For example, the string 'Hello "World"' converts to JSON as {"text": "Hello \"World\""} with properly escaped quotes.
Yes. Query strings like ?name=John&age=30&active=true convert to JSON objects {"name": "John", "age": "30", "active": "true"}. The converter detects key=value&key=value patterns and transforms them to JSON key-value pairs. Useful for API parameter formatting.
Yes. The converter validates that output is valid JSON according to RFC 8259 spec. It checks for proper quotes, commas, brackets, and escaping. Invalid input triggers error messages. This ensures the generated JSON parses correctly in JavaScript JSON.parse() or Python json.loads().