Is my JSON uploaded anywhere?

No. Formatting happens locally in your browser and is never sent to a server.

Can it fix invalid JSON?

It cannot repair broken JSON automatically, but it will point you to roughly where the syntax error is.

JSON Formatter

Runs locally

Paste any JSON and instantly get a clean, indented, human-readable version. Formatting happens entirely in your browser — nothing you paste is ever uploaded.

Indentation

JSON input

0 / 5,000,000

Formatted JSON

Your data is processed locally in your browser and is not uploaded.

Learn more about this tool⌄

How it works

The formatter parses your JSON with the browser's native JSON.parse, then re-serializes it with your chosen indentation using JSON.stringify.

Common use cases

Cleaning up minified API responses
Reviewing configuration files
Debugging malformed JSON payloads
Preparing JSON for documentation

Frequently asked questions

Is my JSON uploaded anywhere?: No. Formatting happens locally in your browser and is never sent to a server.
Can it fix invalid JSON?: It cannot repair broken JSON automatically, but it will point you to roughly where the syntax error is.