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JSON Formatter

Paste ugly JSON, get it beautifully indented — with validation errors pinpointed and one-click minify.

🔒 Your JSON never leaves the browser — safe for API keys and private data

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Format, validate and minify — one tool

API responses arrive as one endless line, config files get mangled by copy-paste, and a single missing comma breaks everything. Paste your JSON here and it's validated as you type — errors show the exact position so you can fix them fast. Format mode pretty-prints with your chosen indentation, Minify strips every unnecessary byte for production payloads, and Sort keys alphabetizes objects recursively — handy for diffing two configs.

FAQ

Is it safe to paste sensitive JSON here?
Yes — parsing and formatting happen entirely in your browser with JavaScript's native JSON engine. Nothing is uploaded, logged or stored.
What do the error messages mean?
They come straight from the JavaScript JSON parser and include the character position of the first problem — usually a missing comma, an unquoted key, or a trailing comma (JSON doesn't allow those).
How large a file can it handle?
Multi-megabyte JSON formats in well under a second — the native parser is extremely fast.

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