JSON Formatter & Validator
Format and validate JSON, with a choice of 2-space or 4-space indentation.
Quick answer: enter your details below and click Format JSON — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Developer
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How to use
- Paste your JSON into the box.
- Choose 2-space or 4-space indentation.
- Click Format JSON and read the formatted result or the error message.
About this tool
Paste JSON and this tool checks whether it parses, then prints it neatly indented so its structure is easy to read. If the input is not valid JSON, it shows the parser error message instead of guessing a fix, so you can find the faulty spot. It handles nested objects, arrays, numbers, strings, booleans and null values.
Frequently asked questions
What happens if my JSON is invalid?
The tool shows the parser error message, such as an unexpected token, so you can locate and fix the problem.
Does it change my values?
No. Formatting only changes whitespace and line breaks; keys, values and their order are kept as parsed.