JSON Formatter & Validator
Format, minify and validate JSON online with detailed error messages. Perfect for API debugging and data preparation.
Paste your JSON here. It can be minified, pretty-printed or contain syntax errors.
Result
What is a JSON formatter?
JSON is the standard format for exchanging data between applications and APIs. A JSON formatter takes code that arrives compressed on a single line and arranges it with readable indentation, or the opposite: minifies it to save space. This validator also detects syntax errors and tells you exactly where the problem is, essential when debugging API responses or configurations.
How to use this tool
- Paste your JSON into the top text area.
- Click Format to indent it with 2 spaces, Minify to compact it, or Validate to check the syntax.
- If there is an error, you will see the message with the exact position (line and column).
- Copy the result with the Copy button and paste it into your code or tool.
Typical use cases
- Debug REST or GraphQL API responses that arrive on a single line.
- Format configuration files (package.json, composer.json, .eslintrc) before committing them.
- Verify that JSON generated by your code is valid before sending it to another API.
Frequently asked questions
Why does my JSON throw a syntax error?
The most common causes: missing double quotes, trailing commas at the end of an object, or single quotes used instead of double quotes. JSON requires double quotes on keys and string values.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks for human reading; minifying removes all unnecessary whitespace to reduce file size, useful when sending data over the network.