Convert newline-delimited GeoJSON (NDJSON) to a GeoJSON FeatureCollection locally. No upload.
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Newline-delimited GeoJSON (NDJSON / GeoJSONL) stores one GeoJSON feature per line - the form produced by big-data geo pipelines (tippecanoe, ogr2ogr). To open it in a web map or a desktop GIS you usually need a single GeoJSON FeatureCollection. This tool wraps the lines back into one clean FeatureCollection.
Every non-empty line is ingested individually as a GeoJSON object: an existing Feature is taken verbatim, whereas a standalone geometry gets wrapped into a Feature with an empty attribute block. Blank lines are silently skipped and the ordering of the records stays strictly intact. The outcome is a single, valid document - a merged FeatureCollection that editors, libraries and desktop programs such as QGIS display directly.
Everything runs entirely locally in the browser - your possibly sensitive location data never leaves your device. Honestly framed: a line that is not valid JSON, or a file with no usable features, is rejected with a clear message rather than producing an empty output. The coordinate order stays longitude then latitude.
| Input formats | NDJSON, JSONL, GEOJSONL |
|---|---|
| Output format | GEOJSON |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Converts newline-delimited GeoJSON (NDJSON / GeoJSONL, one Feature or geometry per line) to a single GeoJSON FeatureCollection. Bare geometries are wrapped as features. Coordinates WGS84. Round-trips with GeoJSON to NDJSON. An invalid or empty file is rejected with a clear error.
Newline-delimited GeoJSON: one Feature (or a bare geometry) as JSON per line, as produced by tippecanoe or ogr2ogr.
A line that is a bare geometry is wrapped into a Feature with empty properties; a Feature line is kept as is.
Yes, use the partner tool GeoJSON to NDJSON to write one feature per line again.
No, the conversion happens entirely locally in the browser; location data never leaves your device.