JSON Formatter & Validator
Beautify, minify and validate JSON — with the exact line and column of any error. Nothing is uploaded.
All parsing happens in your browser — your JSON is never sent anywhere, so it's safe for private data.
What it does
- Format (beautify) — clean indentation and line breaks, with your choice of 2 spaces, 4 spaces or tabs.
- Minify — strip every unnecessary character down to the smallest valid payload.
- Validate — pinpoint syntax errors with the parser's message and the exact line and column.
- Insights — size in bytes, total keys, array/object counts and how deeply the structure nests.
About this tool
A misplaced comma or a missing quote can break a whole config file or API response. Paste the JSON here and Format reveals the structure instantly; if it can't parse, you get the precise spot to fix rather than a vague "invalid JSON". Minify does the reverse for shipping compact payloads.
It runs completely in your browser using the native JSON engine, so it's fast and private — nothing you paste is uploaded, logged or stored.
FAQ
Is my JSON uploaded to a server?
No. All formatting, minifying and validation runs in your browser with JavaScript. Your data never leaves the page, which makes it safe for private or work data.
How do I find a JSON syntax error?
Paste your JSON and press Format or Validate. If it is invalid, the tool shows the parser's error message along with the exact line and column where parsing failed.
What is the difference between beautify and minify?
Beautify (Format) adds indentation and line breaks so JSON is easy to read. Minify strips all whitespace to make the smallest possible payload for sending over a network.