Free Online JSON Formatter & Validator
Format and validate JSON data
About This Free JSON Formatter & Validator
Read messy JSON in seconds with our JSON Formatter & Validator. Whether you pasted a minified JSON response from an API, debugged config files, or generated data programmatically, our tool formats, indents, syntax-highlights, and validates your JSON with crystal-clear error messages. If the JSON is malformed, we tell you exactly where the syntax error is and how to fix it. Developer favorite tool for debugging APIs and writing JSON configs painlessly.
Key Features
- Instant pretty-print formatting
- Syntax validation with error reporting
- Human-friendly indentation
- Minify and beautify options
- Works with large JSON payloads
Why Use This Tool
- Debug API responses fast
- Eliminate JSON syntax errors
- Read nested objects at a glance
- Write clean config files
- Save time on JSON troubleshooting
How It Works in 3 Simple Steps
Paste Your JSON
Copy any JSON text—minified, messy, invalid, or partial—and paste it into the input.
Format & Validate
Click generate to receive beautifully formatted JSON and any validation errors explained.
Copy & Use
Copy the clean, valid JSON and use it in your codebase, config files, or API tests.
Common Use Cases
API Debugging
Paste raw API responses and instantly understand the structure in human-readable format.
Config Files
Format package.json, tsconfig.json, i18n translation files, and all JSON configs.
Data Migration
Validate exported JSON before running large database or CMS migrations to avoid import errors.