JSON Formatter
Format and beautify JSON instantly in your browser.
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How to Use
- 1Paste or type your JSON into the input box.
- 2Click "Format JSON" to beautify it with proper indentation.
- 3Copy the formatted JSON or download it as a .json file.
Features
- Format JSON with clean 2-space indentation
- Validates as it formats, with clear error messages
- Download the result as a .json file
- Copy or download the result
Example
Input
{"name":"PDUtilities","tools":50,"free":true}Output
{
"name": "PDUtilities",
"tools": 50,
"free": true
}PDUtilities JSON Formatter is a free online tool for formatting, validating and beautifying JSON. Paste minified or messy JSON and get clean, indented output instantly, entirely in your browser.
Why format JSON?
APIs, log files and config exports usually deliver JSON as one long line, which is efficient for machines and unreadable for people. The formatter parses your JSON and prints it back with consistent two-space indentation, one property per line, so nested objects and arrays line up and you can actually follow the structure.
It validates while it formats
Formatting requires a successful parse, so invalid JSON is caught immediately. Instead of a vague failure you get the parser's error message and, when your browser reports it, the line and column where it went wrong, which is usually enough to spot a missing comma or quote.
The most common JSON mistakes
| Mistake | Invalid | Valid |
|---|---|---|
| Trailing comma | {"a": 1,} | {"a": 1} |
| Single quotes | {'a': 'b'} | {"a": "b"} |
| Unquoted keys | {a: 1} | {"a": 1} |
| Comments | {"a": 1 // note} | JSON has no comments |
| Special values | {"a": undefined} | {"a": null} |
Most of these are valid in JavaScript object literals, which is why they slip into JSON so often. Strict JSON allows only double-quoted strings, numbers, true, false, null, objects and arrays.
Formatting does not change your data
Keys, values and order are preserved exactly; only whitespace changes. One caveat applies to all JavaScript-based tools: integers larger than 2^53 (about 9 quadrillion), such as some database IDs, can lose precision when parsed. If your JSON contains such numbers as unquoted integers, check them after formatting.
Pasting API responses that contain tokens or customer data? This formatter runs entirely in your browser, so nothing you paste is sent anywhere. Need the opposite? Use the JSON Minifier.