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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 — your JSON never leaves your device.
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