JSON Formatter
JSON that arrives from an API is usually minified into one long line, which is unreadable the moment it grows past a few fields. Formatting it with proper indentation makes the structure obvious.
The same tool works in reverse: paste readable JSON and minify it for transport. If the document will not parse, you get the error rather than a blank result.
Runs in your browser. JSON Formatter processes your input on your own device. Nothing you enter or upload is sent to a server.
How to use the JSON Formatter
- Paste your JSON into the input area.
- Choose whether to beautify or minify it.
- If it fails to parse, read the error and fix the offending position.
- Copy the formatted output.
Frequently asked questions
Why is my JSON invalid?
The usual culprits are trailing commas after the last item, single quotes instead of double quotes, unquoted keys, and comments. All four are legal in JavaScript but not in JSON.
Is my data sent anywhere?
No. Parsing and formatting run in your browser, which matters when the payload contains tokens or customer data.
Does minifying change the data?
No. It removes only whitespace between tokens. The parsed value is identical — it is simply smaller to transmit.