Convert NDJSON to JSON

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About this conversion

Convert a newline-delimited JSON file to a single JSON array. This converter processes your NDJSON / JSON Lines file server-side and returns a JSON file instantly — no account, no software installation, and no file storage. Files are deleted from our servers immediately after conversion.

How to convert NDJSON / JSON Lines to JSON

1. 1. Upload — drag your NDJSON / JSON Lines file onto the converter above, or click to browse.
2. 2. Convert — press Convert. Processing happens on secure servers in seconds.
3. 3. Download — your JSON file downloads automatically. No sign-up required.

Convert NDJSON / JSON Lines to JSON from the command line

curl --fail-with-body \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -F "file=@input.ndjson" \
  -F "conversionId=ndjson-to-json" \
  https://www.omniconvert.cloud/api/convert -o output.json

The API needs a token from a credit pack, and each API conversion uses one credit. Converting on this page stays free. API documentation