JSON Formatter
Free JSON formatter and validator. Beautify JSON with clean indentation, validate it with the exact line and column of any error, or minify it to the smallest size — all in your browser, nothing uploaded.
🔒 Runs entirely in your browser — your JSON is never uploaded.
Format, validate, and minify JSON online
Paste any JSON to instantly beautify it with clean indentation, validate it (with the exact line and column of any error), or minify it to the smallest size. Everything runs in your browser, so your data is never uploaded.
What does formatting JSON do?
It re-indents your JSON with consistent spacing and line breaks so it’s easy to read and debug. Minifying does the opposite — it strips all whitespace to make the file as small as possible for APIs and storage.
How do I fix a JSON error?
If your JSON is invalid, the tool shows the parser’s message plus the line and column where it failed — usually a missing comma, an extra trailing comma, or unquoted keys. Fix that spot and format again.
Frequently asked questions
What does formatting JSON do?⌄
It re-indents your JSON with consistent spacing and line breaks so it's easy to read and debug. You can pick 2 spaces, 4 spaces, or tabs.
How do I find what's wrong with my JSON?⌄
Paste it and click Format. If it's invalid, the tool shows the parser's message plus the exact line and column where it failed - usually a missing comma, a trailing comma, or unquoted keys.
What is minifying?⌄
Minifying strips all whitespace and line breaks to make the JSON as small as possible, which is useful for APIs, config, and storage. Formatting does the opposite for readability.
Is my data private?⌄
Yes. Everything runs in your browser, so the JSON you paste is never uploaded or stored.
Have another question? Get in touch.
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