Is my JSON data uploaded anywhere?

No. This formatter runs entirely in your browser using JavaScript's built-in JSON parser — your data is never sent to a server.

Does this tool validate JSON as well as format it?

Yes. Formatting requires parsing the JSON first, so any syntax error is caught and reported with its line and column before formatting happens.

Is there a size limit?

There's no artificial limit — very large files are only bounded by your browser's own memory and performance.

Can I minify JSON instead of formatting it?

Yes, use the Minify button to collapse the same JSON into a single compact line with no extra whitespace.

What does Tree view show that the text view doesn't?

Tree view lets you collapse and expand individual objects and arrays, which makes it much easier to navigate a deeply nested response without losing your place — especially useful for large API payloads.

JSON Formatter & Validator

Format, beautify and validate JSON instantly with clear error locations.

INPUT

Formatted JSON appears here...

Processed 100% in your browser — nothing you enter here is ever uploaded.

Common use cases

Debugging an API response

Paste a minified response straight from your network tab to see nested fields clearly instead of scanning one long line.

Reviewing a config file before committing

Catch a stray comma or missing bracket in a package.json or tsconfig.json before it breaks someone else's build.

Fixing JSON mangled by copy-paste

Text copied from a chat app, PDF, or email often loses its formatting — reformat it back into something readable.

How to use the JSON Formatter

Paste or type your JSON into the input panel on the left — nothing you enter leaves your browser.

Click "Format" to pretty-print it with 2-space indentation, or "Minify" to strip all whitespace for production use.

If the JSON is invalid, the exact line and column of the problem is shown so you can fix it fast.

Use the Copy button on the output panel to grab the result, ready to paste wherever you need it.

Switch the output to "Tree" view to explore deeply nested objects and arrays as a collapsible tree instead of raw text.