Free JSON Formatter & Validator
Format, validate, and minify JSON online. Beautify JSON with custom indentation, check for errors, and download results. 100% free, no signup required.
Input JSON
Paste your JSON here
Formatted Output
Click Format to see output
Format JSON
Beautify minified JSON with proper indentation and line breaks. Choose 2 or 4 spaces for readability.
Minify JSON
Compress JSON by removing whitespace. Reduces file size for faster API responses and storage.
Validate JSON
Check if your JSON is valid. Get detailed error messages showing exactly where syntax errors occur.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's based on a subset of JavaScript and is the most popular format for transmitting data in web applications.
JSON is used extensively in REST APIs, configuration files, and data storage. This free online JSON formatter helps developers quickly format, validate, and minify JSON data without installing any software.
Common JSON Use Cases:
- API request and response payloads
- Configuration files (package.json, tsconfig.json)
- Data exchange between client and server
- NoSQL database storage (MongoDB, CouchDB)
- Log files and structured data
