NDJSON to JSON Converter
ConvertersConvert Newline-Delimited JSON (NDJSON / JSON Lines) to a JSON array instantly in your browser. Swap to JSON→NDJSON in one click. 100% client-side and free.
NDJSON → JSON
NDJSONndjson
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JSONjson
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Input: 312 chars
About NDJSON to JSON Converter
The NDJSON to JSON converter reads Newline-Delimited JSON (also called JSON Lines, `.ndjson` or `.jsonl`) — each line is an independent JSON value — and assembles them into a JSON array. Empty lines are skipped. Both editors are live — swap to JSON→NDJSON with one click. The JSON output has an interactive tree view and graph visualization.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Each non-empty line → one element in the output JSON array
- ✓Empty lines are ignored
- ✓JSON output has interactive tree view and graph visualization
- ✓Swap direction to JSON→NDJSON with a single click
- ✓Download converted JSON as a .json file
- ✓Copy output to clipboard in one click
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Converting NDJSON log exports to a JSON array for analysis tools
- Merging JSON Lines streaming API responses into a single JSON array
- Preparing NDJSON machine-learning datasets for consumption as JSON arrays
- Viewing NDJSON Elasticsearch bulk API payloads as arrays
- Debugging NDJSON log output by converting to a browseable JSON structure
Frequently Asked Questions
QWhat is NDJSON / JSON Lines?
NDJSON (Newline-Delimited JSON) is a format where each line of a text file is a valid, self-contained JSON value. It is used for streaming data, log files, and large dataset exports.
QMust every line be a JSON object?
No — each line can be any valid JSON value: object, array, string, number, or boolean. The converter collects all non-empty lines into a single JSON array.
QIs my data sent to a server?
No. All conversion runs in your browser.