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JSON Formatter and Validator
Validate, beautify, and minify JSON data with clear error messages.
How to Use
- Paste JSON into the input box.
- Click Format JSON to beautify, or Minify JSON to compress.
- Check the validation banner for errors.
- Copy the result, or Reset to start over.
Example
Input: {"a":1,"b":[2,3]}
Formatted output:
{
"a": 1,
"b": [
2,
3
]
}Frequently Asked Questions
What does formatting JSON do?
Formatting adds indentation and line breaks so nested structures are easy to read, which helps when debugging APIs or config files.
What is minified JSON?
Minifying removes all unnecessary whitespace, producing the smallest possible payload. This is what you typically send over a network.
Is my JSON data uploaded anywhere?
No. Parsing and formatting happen in your browser. Nothing is sent to a server.
Why do I see a parse error?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or truncated JSON.