JSON Formatter
Beautify or minify JSON and validate syntax.
Your files stay on your device
This tool processes everything locally in your browser. Nothing is uploaded to a server.
📝 About JSON Formatter
The JSON Formatter takes raw JSON and either beautifies it with clean two-space indentation or minifies it into a single compact line. Paste a response from an API, a configuration file or a log entry, press a button, and the result appears in a code panel you can copy with one click.
Because the tool parses your input with the browser’s built-in JSON parser before re-serializing it, it doubles as a quick validator. If something is wrong, such as a trailing comma, single quotes instead of double quotes, or an unquoted key, you’ll see the parser’s error message instead of a result, which usually points you close to the problem. Remember that strict JSON does not allow comments, so files like tsconfig.json with comments will be rejected.
Use the pretty view when you need to read or review nested data, and the minified view when you want to shrink a payload before pasting it into a request or storing it. All parsing and formatting happens locally in your browser, so the data you paste is never uploaded.
📘 How to use
- 1
Paste JSON
Paste raw JSON text.
- 2
Beautify/Minify
Pick beautify or minify.
- 3
Copy
Copy the formatted result.
❓ FAQ
Why do I get an error for JSON that looks fine?
Common causes are trailing commas, single-quoted strings, unquoted keys or comments, none of which are allowed in strict JSON. The error message shown below the buttons usually indicates where parsing stopped.
What indentation does the beautify option use?
Beautified output uses two spaces per nesting level. Minify removes all optional whitespace so the result fits on one line.
Is my JSON sent to a server?
No. Parsing and formatting run entirely in your browser with JavaScript, so you can safely format data that contains internal details.
Will formatting change my data?
The values stay the same, but if an object contains duplicate keys only the last one is kept, and very large integers beyond JavaScript’s safe range may lose precision.