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Paste your JSON or open a file: the validator scans the whole document in one pass and lists every error with position, JSON path and a plain-language explanation. Common mistakes (trailing commas, comments, single quotes, unquoted keys, Python literals) can be repaired automatically with one click.
Finds every syntax error in one pass, with line, column and the exact JSON path (e.g. root.mods[3].name).
One-click repair for the classics: trailing commas, // and /* */ comments, single quotes, unquoted keys, True/False/None, broken numbers.
Formatter with 2/4 spaces or tabs, minifier and alphabetical key sorting.
Everything with an unambiguous interpretation: trailing commas, JavaScript-style comments, single quotes, unquoted keys, Python literals (True/False/None), leading zeros or + signs, missing commas between values and more. The repaired result is always strictly valid JSON.
The path (e.g. root.settings.mods[2]) tells you where in your data structure the problem sits: much faster to fix in large config files than a line number alone.
No. Validation, repair and formatting run entirely in your browser, and your JSON never leaves your device.
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