NDJSON Viewer

Parses newline-delimited JSON (NDJSON / JSON Lines) input, validates each line independently, and displays the results with line numbers and error highlighting — all client-side.

• →Paste NDJSON text where each line is a separate JSON value — objects, arrays, strings, numbers, and booleans are all valid.
• →Invalid lines are highlighted in red with the specific parse error so you can spot malformed entries at a glance.
• →Use the "Copy valid" button to extract only correctly parsed lines, useful for cleaning up partially corrupt log files.
• →The Examples picker includes a "Pro" preset with intentionally invalid lines so you can see error highlighting in action.