JSON Formatter & Validator
Professional JSON toolkit with instant validation, formatting, and minification. Catch syntax errors with precise line numbers and transform messy API responses into readable code.
Input
Output
Why Use a JSON Formatter?
JSON is the backbone of modern web APIs, configuration files, and data storage. When you receive a minified JSON response from an API or a compact log entry, reading it without proper formatting is a frustrating experience. A JSON formatter transforms that dense string into a well-structured, indented document that reveals the hierarchy of objects, arrays, and values at a glance.
Key benefits of using a JSON formatter include:
- Instantly spot nested structures and data relationships.
- Catch syntax errors before they break your application.
- Minify JSON for optimized network transfer and storage.
- Copy formatted output directly into your codebase or documentation.
How It Works
Paste & Format
Paste any JSON string into the input area and click Format. The tool parses it using the native JSON.parse engine and re-serializes it with your chosen indentation (2 or 4 spaces).
Validate Instantly
If your JSON contains syntax errors, the tool reports the exact error message including the position of the problem, so you can fix it quickly without guesswork.
Minify for Production
Use the Minify button to strip all whitespace and produce the most compact representation. Perfect for embedding in URLs, config files, or reducing payload sizes.