JSON Formatter & Validator – Free Online
Paste raw JSON to format it with proper indentation, validate it, or minify it for production. Runs entirely in your browser.
How to Use
- 1
Paste your raw JSON into the input field
- 2
Click "Format" to pretty-print or "Minify" to compress
- 3
Copy the result with the copy button
Frequently Asked Questions
What does JSON formatting do?
Formatting adds proper indentation and line breaks to JSON, making it easier to read. Minifying removes all whitespace to reduce file size.
Can I validate my JSON with this tool?
Yes — if your JSON has a syntax error, the tool shows an error message and highlights the problem.
Is there a size limit for JSON input?
The tool handles JSON files of several MB without issues. Very large files may be slower to format.
Is my JSON data safe?
Yes — all processing happens locally in your browser. Your data is never sent to any server.
Format and validate JSON
A JSON formatter takes messy or minified JSON and lays it out with clean indentation so it is easy to read, while also flagging syntax errors. Paste your JSON and it is beautified and checked in one step.
It turns an unreadable single-line blob into a clear, properly nested structure.
When JSON has to be readable
- Reading API responses and config files.
- Spotting a missing comma or bracket that breaks parsing.
- Cleaning up JSON before pasting it into code.
- Comparing two versions? Use the text diff. Decoding payloads? The Base64 encoder.
Your JSON never leaves the browser
Your JSON is formatted in your browser and never uploaded, so it is safe for production data.