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NDJSON validator

Validate newline-delimited JSON and report the first invalid line.

Runs in your browser. Your input is not uploaded or saved.

Result

Add your input, then select Check NDJSON.

How to use it

Paste one JSON value per line. Each non-empty line is checked separately and minified.

What to keep in mind

Blank lines are ignored. Pretty-printed multiline objects are not NDJSON.

Up to 2 MB per input, with smaller limits for complex operations. Clear removes the current input and result. Numbers use JavaScript precision; unsafe integers are rejected.

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