How to convert JSON to NDJSON
- 1 Drop your JSON files onto the page, or click “Choose files”. You can add many at once, or a whole folder.
- 2 NDJSON is already selected as the output. Optionally open Options to adjust sort keys.
- 3 Click Convert, then Save. Converting several files? Save them all as one ZIP.
About the formats
JSON · JavaScript Object Notation
JSON is the most common data format for APIs, configuration files and web apps.
NDJSON · Newline-delimited JSON
NDJSON (also called JSON Lines) stores one JSON object per line. It is used for logs, data pipelines and bulk imports.
The conversion runs on your device using proper parsers for each format (yaml, smol-toml, fast-xml-parser and PapaParse). You can adjust: sort keys.
Frequently asked questions
How do I convert JSON to NDJSON?
Drop your JSON files onto the page, or click “Choose files”. You can add many at once, or a whole folder. NDJSON is already selected as the output. Optionally open Options to adjust sort keys. Click Convert, then Save. Converting several files? Save them all as one ZIP.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly. Your files never leave your device, so it is safe for private photos, contracts and business data. Once the page has loaded it even works offline.
Will converting JSON to NDJSON reduce quality?
No. JSON to NDJSON conversion is exact: the data is parsed and rewritten, not approximated.
Can I convert multiple JSON files to NDJSON at once?
Yes. Add as many JSON files as you like; they are converted in parallel on your device and you can download them all as a single ZIP.
Is it free? Are there limits?
It is free, with no sign-up, no watermark and no daily limits. Because nothing is uploaded there is no upload size limit either; the only limit is your device’s memory, which matters mostly for very large videos.
Convert JSON to other formats
Convert other formats to NDJSON
See everything the JSON converter and the NDJSON converter can do.