NDJSON is newline-delimited JSON: each line is one complete JSON value, often used for logs, exports, and streaming data.

Can blank lines be ignored?

Yes. The converter can skip blank lines when converting NDJSON to a JSON array.

Does conversion run locally?

Yes. No NDJSON or JSON array content is uploaded by the tool.

NDJSON Converter

Convert newline-delimited JSON streams into formatted JSON arrays, or compact arrays back into NDJSON.

Browser-local

Source

Mode

Skip blank lines

{"id":1,"event":"created"}
{"id":2,"event":"updated"}

2 linesStream-friendly JSON

Converted output

[
  {
    "id": 1,
    "event": "created"
  },
  {
    "id": 2,
    "event": "updated"
  }
]

Converted 2 records locally

How to convert NDJSON

Paste NDJSON where each line is a valid JSON value, then convert it into a formatted JSON array. Switch modes to take a JSON array and emit one compact JSON item per line.

When developers use NDJSON

NDJSON appears in event streams, log exports, queue dumps, analytics pipelines, and bulk API imports. This converter helps inspect records before feeding them into tests or data jobs.

Validation behavior

Malformed lines report the exact line number. JSON array conversion rejects non-array input so object payloads are not silently changed into a different shape.

NDJSON questions

What is NDJSON?: NDJSON is newline-delimited JSON: each line is one complete JSON value, often used for logs, exports, and streaming data.
Can blank lines be ignored?: Yes. The converter can skip blank lines when converting NDJSON to a JSON array.
Does conversion run locally?: Yes. No NDJSON or JSON array content is uploaded by the tool.

What this NDJSON Converter does

Use this NDJSON converter to transform newline-delimited JSON into a formatted JSON array or convert a JSON array back into one compact JSON record per line. It helps developers inspect stream-friendly JSON from logs, queues, analytics exports, and bulk APIs.

When developers use it

Convert NDJSON log exports into a readable JSON array for debugging or code review.
Prepare newline-delimited JSON from array fixtures for bulk import and streaming workflows.
Locate malformed records with line-level parser errors before running a data job.

Privacy, input, and output

NDJSON parsing and conversion are local browser transformations. PayloadHarbor does not upload stream data, logs, or converted output.

Choose NDJSON to JSON array or JSON array to NDJSON, paste the source text, and run Convert. Output can be copied or downloaded for local use.

Validation rules and limitations

Each non-blank NDJSON line must contain one complete valid JSON value.
JSON to NDJSON mode requires a top-level JSON array; object-only input is rejected to avoid changing structure silently.