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NDJSON Formatter Validator

Validate, format, compact, and inspect NDJSON newline-delimited JSON. Find line errors, parse JSONL logs, count records, and convert NDJSON to JSON array directly in your browser.

Paste newline-delimited JSON, JSONL logs, event streams, or exported records. Each non-empty line should be a complete JSON value.

Options

NDJSON means each line is a separate JSON value. It is common in logs, streams, exports, queues, and data pipelines.

Output

Formatted NDJSON output will appear here.
NDJSON validation and formatting happens directly in your browser. Your pasted data is not uploaded to a server.

Validating Newline Delimited JSON Records

NDJSON, also called JSONL or JSON Lines, stores one JSON value per line. It is common in logs, event streams, analytics exports, message queues, and data processing pipelines.

This NDJSON Formatter Validator checks every line separately, shows line-specific JSON errors, formats valid records, converts records to a JSON array, and gives a quick summary of the data.

Formatting or Validating NDJSON

  1. Paste NDJSON, JSONL logs, or newline-delimited records.
  2. Choose whether output should be pretty NDJSON, compact NDJSON, or a JSON array.
  3. Turn on object-only validation if every line should be an object.
  4. Run the validator and review line errors or parsed record previews.
  5. Copy the formatted output for debugging, docs, or data cleanup.

Common NDJSON Validator Use Cases

  • Finding the exact bad line in JSONL logs.
  • Converting NDJSON exports into a JSON array.
  • Compacting pretty JSON records into one record per line.
  • Checking event stream payloads before importing them.
  • Sorting object keys for cleaner record comparison.
  • Reviewing queue, analytics, or pipeline data samples.

Example NDJSON Input

{"level":"info","message":"Started"}
{"level":"warn","message":"Slow response"}
{"level":"error","message":"Invalid payload"}

NDJSON Is Not the Same as a JSON Array

A normal JSON array wraps records inside square brackets and commas. NDJSON keeps each record on its own line without wrapping the whole file. This makes it easier to stream, append, and process one record at a time.

Use JSON array output when you need to paste the records into a tool that expects normal JSON instead of line-based JSON.

Frequently Asked Questions

What is NDJSON?

NDJSON means newline-delimited JSON. Each line is a separate JSON value, often a JSON object.

Is NDJSON the same as JSONL?

Yes. JSONL, JSON Lines, and NDJSON are commonly used for the same line-based JSON format.

Can this show which line is invalid?

Yes. Invalid records are reported with their original line number and error message.

Can this convert NDJSON to a JSON array?

Yes. Choose JSON array output to wrap valid records into a normal JSON array.

Is my NDJSON uploaded anywhere?

No. Validation and formatting happens directly in your browser.