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TinyTools

JSON Formatter

Format, validate and tidy up your JSON.

2 spaces

Zero puts each value on its own line with no indentation.

Everything is processed on your device. Nothing you upload or type is sent to a server, and nothing is stored.

JSON Formatter online

Paste messy or minified JSON and get it back cleanly indented. If there is a syntax error, you get the line and column where it went wrong instead of a vague failure. Nothing is sent anywhere, so it is safe to use with API responses that contain real data.

How to use json formatter

  1. Paste your JSON

    Drop it into the input box, or load a .json file from your device.

  2. Choose an action

    Format to indent it readably, or Minify to strip every unnecessary character.

  3. Copy or download

    Copy the result to your clipboard, or save it as a .json file.

Frequently asked questions

Is my JSON sent to a server?

No, and this matters for a formatter. Parsing happens entirely in your browser using the built-in JSON parser, so it is safe to paste API responses, tokens or customer data without it leaving your machine.

Why does my JSON fail to parse?

The usual culprits are a trailing comma after the last item, single quotes instead of double quotes, unquoted keys, or a stray comment. Strict JSON allows none of these. The error message points at the exact position so you can find it quickly.

What does minifying do?

It removes all whitespace and line breaks. The data is identical, but the payload is smaller, which is useful for storing JSON in a config value or sending it over the network.

Can it handle very large files?

Files up to a few megabytes format almost instantly. Much larger inputs may briefly freeze the tab while the browser works through them.

Does it sort or change my data?

No. Key order and values are preserved exactly as written — only the spacing changes.

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