JSON Formatter
Format, validate and minify JSON documents.
What is the JSON Formatter?
A JSON formatter takes minified or malformed JSON and re-indents it into readable, properly nested text. This one also validates as you type, reporting the exact line and character of a syntax error, and can minify back down to remove every non-essential byte.
Frequently asked questions
Is it safe to paste production JSON here?
Yes. Formatting and validation run in JavaScript inside your own browser tab. The JSON is never sent to a server, never logged, and never leaves your device, so API responses containing tokens or customer data stay private.
Why does my JSON say invalid when it looks correct?
The usual causes are trailing commas after the last item, single quotes instead of double quotes around keys and strings, unescaped newlines inside a string, or a stray comment. JSON allows none of those. The error message points at the exact offset.
What is the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks so humans can read the structure. Minifying strips all optional whitespace to make the payload as small as possible for transport. Both produce identical data — only the presentation differs.
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JSON Formatter is one of 10 tools in Text & Code on Toolkit Hub, a free collection of browser-based utilities. It requires no account and no installation. Browse all tools.