JSON Formatter

Pretty-print or minify JSON.

Your data is processed in your browser, never sent to a server

Turn messy or single-line JSON into a readable, indented format for free. It helps you spot errors in invalid JSON and is ideal for tidying API responses and config files. Everything runs in your browser; your data never leaves your device.

How it works

Paste your JSON into the area above.
Press "Format".
Copy the tidy, indented JSON.

Frequently asked questions

Is formatting JSON free?

Yes, the JSON formatter is completely free and requires no sign-up.

Is my data sent to a server?

No, JSON is processed entirely in your browser; the data you paste is never sent anywhere.

Does it detect invalid JSON?

Yes, if the JSON is malformed it helps you see where the problem is.

Do large JSON files work?

Reasonably sized JSON is formatted quickly in the browser.

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