What Is JSON Formatting?
JSON (JavaScript Object Notation) is a lightweight data interchange format. Formatting makes JSON human-readable by adding proper indentation and line breaks. Validation checks that your JSON follows the correct syntax rules. Our tool handles both tasks in one click.
How to Use
Paste your raw JSON string into the input area. Select "Beautify" for pretty-printed output with 2-space indentation, or "Compress" for a minified single-line version. Click "Process JSON" — the tool validates the syntax first, then formats. Error messages help you fix invalid JSON quickly.
Usage Example
Input (minified):
{"name":"Alice","age":30,"city":"New York","skills":["Python","JavaScript","SQL"]}
Output (beautified):
{
"name": "Alice",
"age": 30,
"city": "New York",
"skills": [
"Python",
"JavaScript",
"SQL"
]
}
Common JSON Errors
| Error | Cause | Fix |
|---|---|---|
| Unexpected token | Trailing comma | Remove the last comma before closing brace |
| Expected property name | Single quotes instead of double | Replace ' with " around property names |
| Unexpected number | Leading zeros | Remove leading zeros (e.g., 01 → 1) |
Frequently Asked Questions
This tool validates JSON syntax only. For schema validation (checking that data matches a specific structure), you need a JSON Schema validator — a different tool entirely.
Since processing is local, the limit depends on your browser's memory. Most modern browsers handle JSON files up to 100MB without issues. The output size is displayed after processing.