JSON Formatter
Beautify, validate, and minify JSON with the exact line and column of any syntax error — all in your browser, nothing uploaded.
Valid, formatted JSON appears here.Add an AI chat agent to your site
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How does the JSON Formatter work?
Paste your JSON into the input panel — an API response, a config file, a webhook payload.
Choose Beautify with 2-space, 4-space, or tab indentation, or switch to Minify to strip every byte of whitespace.
Invalid JSON reports the parser message plus the line and column, instead of a character offset you'd have to count to yourself.
Optionally sort keys alphabetically to make two payloads diffable, then copy the result.
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Webhooks and integrations
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FAQ
Beautifying adds indentation and line breaks so a human can read the structure. Minifying strips every unnecessary byte, which is what you want when sending JSON over the wire or embedding it in a page. Both produce identical data — only the whitespace differs.
The usual culprits are a trailing comma after the last item, single quotes instead of double quotes, unquoted keys, or a stray comment. JSON allows none of these, even though JavaScript object literals do. The error panel gives you the line and column so you can go straight to it.
No. JSON objects are unordered by specification, so reordering keys produces an equivalent document. It's useful for diffing two API responses that contain the same data in a different order. Arrays are never reordered, because array order is meaningful.
No. Parsing and formatting happen entirely in your browser using the native JSON parser. Nothing is uploaded, logged, or stored — which matters when the payload you're debugging contains customer data or API keys.
It handles typical API responses and config files comfortably. Very large documents — tens of megabytes — may make the browser sluggish, since everything is processed in memory on the page. For files that size, a streaming command-line tool is a better fit.
Not currently. This validates strict JSON as defined by the specification, which is what APIs and most parsers expect. Comments and trailing commas will be reported as errors rather than silently accepted.