Convert NDJSON to a JSON Array or CSV

What the error actually means

NDJSON contains one complete JSON value per line. A standard JSON parser reads the first object successfully, then reports extra data when it encounters the next object. The file is not necessarily corrupted; it is a different serialization format.

Likely causes

• A logging or streaming system exported JSON Lines.
• A .json extension was used for an NDJSON file.
• Multiple API responses were appended without surrounding array brackets.
• A converter expects an array of objects but received independent records.

A safe repair workflow

1. 1Confirm that each non-empty line is valid JSON on its own.
2. 2Use the NDJSON converter rather than wrapping raw text with brackets manually.
3. 3Choose CSV when the records have a reasonably consistent object shape.
4. 4Review how nested objects and arrays were represented in the output.

How to verify the result

A file that downloads successfully is not automatically a correct file. Check the result at both the structural and business-data levels:

• The output record count equals the number of valid input lines.
• No first or final record is missing.
• Nested values use an intentional flattening strategy.
• Invalid lines are reported rather than silently skipped.