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Format and indent JSON, or minify it, with exact error positions and big numbers kept as written.
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Runs in your browserOpen tool
Developer & Web
JSON Validator
Check whether JSON is valid and see the exact line, column and reason when it is not.
- Runs in your browser
- Works on mobile
- In: JSON
- Out: TEXT
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About JSON Validator
Reports valid or invalid, and for invalid JSON shows the line and column with a few lines of context and a caret under the problem, plus a plain-English explanation.
For valid JSON it summarises the structure: how deep it nests, how many objects, arrays and keys, and warnings for duplicate keys and for numbers too large for JavaScript to hold exactly.
It does not validate against a JSON Schema; it checks the syntax.
How to use it
- 1Type or paste your text, or open a file.
- 2Choose any options - the result updates as you type.
- 3Copy the result or download it as a file.
Questions
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