NDJSON validator & converter

Validate newline-delimited JSON and convert it to a JSON array, or emit one compact JSON record per line from an array.

01 Input

YOUR INPUT

02 Output

LOCAL RESULT

QUICK GUIDE / 05

How to use

Select Load example to restore the sample, or replace the labeled inputs with your own values.
Review the options and select Run tool. No input is sent to a server.
Each nonempty line is a separate JSON value. Array mode requires a top-level array. For Array to NDJSON, replace the input with a JSON array, for example [{"id":1},{"id":2}].
Inspect the result, then copy or download it. Clear removes visible inputs and output.

A worked example

Load example restores these values.

Direction:
NDJSON to array

JSON records:
{"id":1}
{"id":2}

Expected result

[
  {
    "id": 1
  },
  {
    "id": 2
  }
]

Scope & limitations

Blank lines are ignored. One malformed line stops conversion and reports its line number. Inputs are processed in memory. JSON numbers use JavaScript binary64 precision; keep large exact identifiers as strings. Numeric overflow is rejected.

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NDJSON validator & converter

01 Input

02 Output

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