JSON array to NDJSON

Client

Convert a JSON array into newline-delimited JSON (JSONL)—one object per line for streaming ingest and log replay.

Learn more: JSON to NDJSON

Split a JSON array into newline-delimited JSON (NDJSON / JSONL)—one minified object per line—for streaming ingest, log replay, and tools that read JSONL files.

NDJSON format

Each line is a standalone JSON value (usually an object). Blank lines are ignored by most consumers. This matches how many analytics and observability pipelines batch events.

Array vs stream

Start from a JSON array when you already have a batch snapshot. For live streams you often append lines over time; this page helps when you need to convert an array export into line-oriented text.

Privacy

Line splitting runs in your browser—no upload required.

About JSON array to NDJSON

One JSON object per line (NDJSON / JSONL)—client-side. Parsing and transforms run in your browser—Toolcore does not upload your JSON for this operation.

How to use

Paste a JSON array (or follow the two-array example on join tools). Use Load example when shown, or prefill with ?q= / ?qb= on the tool URL.

Input and limits

Fix JSON syntax errors before expecting output. Very large arrays may slow the tab—trim samples during exploration, then scale up locally.

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Nearby workflows on Toolcore

  • JSON formatter — JSON format online: pretty-print, minify, validate, escape, download . Useful once JSON parses on this page.
  • JSON replace values — Replace every value equal to from with to—use from|to, JSON or plain text. Useful once JSON parses on this page.
  • JSON filter field by regex — Keep rows whose string field matches a regular expression—local. Useful once JSON parses on this page.
  • JSON count field nulls — Count null or missing values for one row field—metadata. Useful once JSON parses on this page.

Common use cases

  • Turn a JSON array export into JSONL for streaming pipelines or log replay tools.
  • Prepare batch events as one-object-per-line files without jq or a local script.
  • Split snapshot arrays into line-oriented text for grep and tail workflows.

Common mistakes to avoid

  • Expecting a wrapping array in the output

    NDJSON is line-oriented—each line is its own JSON value, not a single array document.

  • Including trailing commas in source JSON

    Fix parse errors with the JSON formatter before converting to lines.

  • Using NDJSON for spreadsheet import

    Spreadsheets expect CSV/TSV—use row export tools instead.

FAQ

Is NDJSON the same as JSONL?

Yes—both names refer to newline-delimited JSON objects.

Is data sent to a server?

No. Line splitting runs in your browser.

Can agents prefill input?

Yes—use URL query prefill for the JSON array.

More tools

Related utilities you can open in another tab—mostly client-side.