JSON Formatter
Format, validate & beautify JSON in your browser.
How to use
- 1 Paste or type your JSON into the input panel.
- 2 Pick an indent width — 2 spaces, 4 spaces, or tab.
- 3 Press Format to beautify, or Minify to compress.
- 4 Read any error message if the JSON is invalid, and fix the highlighted spot.
- 5 Copy the result or download it as a .json file.
About JSON Formatter
The JSON Formatter takes messy, minified or hand-edited JSON and turns it into clean, indented, readable output — or strips it back down to the smallest valid payload.
Paste your JSON, choose an indent width, and My Tools Garage parses it with the same engine your browser uses, so what you see is exactly what a parser will accept.
If the JSON is invalid, you get a calm, specific error pointing at the problem instead of a silent failure.
Everything runs locally in your browser.
Your data is never uploaded to a server, logged, or stored — which matters when the JSON contains API keys, customer records or anything you would rather not paste into an unknown backend.
That privacy guarantee is the whole point of My Tools Garage: the tool is just JavaScript running on your machine.
Formatting JSON makes it far easier to scan nested objects, spot a missing comma, diff two payloads, or hand a colleague something readable.
Minifying does the opposite for production — removing every byte of insignificant whitespace before you ship a config file or embed a payload.
Validation confirms the document parses before you commit it.
Use it for API responses, configuration files, log lines, GeoJSON, package manifests, or anything else that speaks JSON.
FAQ
Is my JSON uploaded anywhere?
No. The formatter runs entirely in your browser using JavaScript. Your JSON never leaves your device and is not sent to any server.
What does "minify" do?
Minifying removes all insignificant whitespace (spaces, newlines, indentation) while keeping the JSON semantically identical, producing the smallest valid output.
Why am I getting an "invalid JSON" error?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which are valid JSON. The error message indicates where parsing failed.