Merge multiple GeoJSON files into one FeatureCollection.

npm install geojson-merge

Merges GeoJSON objects (geometry, feature, or featurecollection) into one FeatureCollection.

Options:

• -s or --stream to use the high-performance streaming mode. This allows you to combine very large GeoJSON files. Streaming mode requires every GeoJSON file to contain a FeatureCollection at the top level.

  npm install -g geojson-merge geojson-merge file.geojson otherfile.geojson > combined.geojson

1. Start the node.js application
2. Open cmd.exe
3. Browse to a folder where you'd like geojson-merge installed
4. In cmd.exe type the install string from above
5. Wait patiently, it could take a moment to start
6. Use cd node_modules to change directory to the node_modules folder
7. For simplicity sake, move your .geojson files into this node_modules directory
8. Run this command to merge your files:

node geojson-merge file1.geojson file2.geojson > merged.geojson

Merging multiple files in a folder

geojson-merge folder/*.geojson > combined.geojson