JSON Formatter & Validator
Paste JSON to instantly beautify, minify or validate it. Errors are reported with the exact line and column so you can fix malformed data fast.
About this tool
A JSON formatter and validator turns messy, minified or hand-written JSON into clean, readable, properly indented text — and tells you immediately if the syntax is invalid. JSON (JavaScript Object Notation) is the standard format for APIs, config files and scraped data, but a single missing comma or trailing brace breaks the whole document. This tool catches that in real time.
What you can do
- Beautify — re-indent compact JSON with 2 or 4 spaces so it is human-readable.
- Minify — strip all whitespace to the smallest valid payload for transport.
- Validate — confirm the document is syntactically correct, with the error's line and column when it is not.
Common uses
Developers use it to inspect API responses, debug webhook payloads, tidy configuration files, and clean up data extracted while web scraping. Because everything runs locally in your browser, you can safely format sensitive payloads — nothing is uploaded.
Frequently asked questions
It re-indents JSON so it is easy to read (beautify), removes whitespace to shrink it (minify), and checks that the syntax is valid — reporting the precise location of any error.
These usually mean a missing or extra comma, an unquoted key, single quotes instead of double quotes, or a trailing comma before a closing brace or bracket. This validator points to the line and column so you can spot it quickly.
No. Formatting and validation happen entirely in your browser using the native JSON parser, so your data never leaves your device.
Beautify adds indentation and line breaks for readability while editing or debugging. Minify removes all unnecessary whitespace to produce the smallest valid output, which is best for sending over the network.