JSON Formatter Online
Pretty print & validate JSON in one click, free and fast
Format and beautify JSON with proper indentation, validation and error highlighting.
Format and validate JSON in your browser
This free JSON formatter helps you pretty print and validate JSON strings directly in your browser. It improves readability, surfaces syntax errors and makes it easier to debug API responses or configuration files.
Key features
- Pretty print JSON with consistent indentation.
- Validate JSON syntax and highlight common errors.
- Copy and share formatted JSON with a single click.
- Client-side processing for better privacy (most tools).
Use cases
- Inspecting and debugging API responses.
- Reviewing and editing configuration files.
- Teaching or learning JSON structure.
- Cleaning up minified JSON before sharing with teammates.
Frequently Asked Questions
How do I format JSON online?
Paste your JSON into the input box, click format, and the tool will pretty print it with indentation and line breaks so it is easy to read.
Will this JSON formatter validate my JSON?
Yes. If your JSON is invalid, the formatter will usually highlight the position of the error so you can fix brackets, commas or quotes.
Is my JSON data stored on your server?
The formatter runs in your browser for most use cases and does not store your JSON on our servers. For tools that require network access, this will be clearly indicated in the UI.