Paste JSON to pretty-print it with clean indentation or minify it into a single line. Syntax errors are reported with their position, and the payload never leaves your browser — ideal for tokens, API responses and config files.

Format & minify

Precise error positions

Structure summary

100% in-browser

Use the tool now Step by Step

Trusted & free

It is completely free, private and requires no signup.

IDs are not secrets

A UUID identifies a record — never use it as an authentication token.

Use crypto randomness

Math.random() is predictable. Use the CSPRNG for tokens, IDs and secrets.

Never trust a JWT blindly

Decoding is not verifying. Always validate the signature and claims on the server.

Keep secrets out of code

Generate keys here, then store them in environment variables or a vault.

How it works

Drop in an object, array or any JSON snippet. Validation happens instantly as you type.

If the JSON is invalid, the message tells you the line and column to fix.

Choose an indentation level, collapse to one line, or copy the clean result.

Examples & Data

Compact	Formatted
{"id":1,"ok":true}	{ "id": 1, "ok": true }
[1,2,3]	[ 1, 2, 3 ]

Formatting changes layout only — the values are preserved exactly.

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Ready to try it?

It is completely free, private and requires no signup.

Use the tool now

100% Free No signup Private & secure

Help Center

Frequently Asked Questions

It removes all whitespace between tokens. The data is identical — only smaller and no longer human-friendly to read.

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys and missing brackets.

No. Formatting and validation run entirely with JavaScript in your browser — nothing is transmitted.

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