A lint tool for newline-delimited GeoJSON streams. Based on geojsonhint.

npm install --global ndgeojson-lint

ndgeojson-lint filename.ndgeojson

You can also pipe newline-delimited GeoJSON to ndgeojson-lint on STDIN, e.g.:

find . -name '*.geojson' -exec cat {} \; | jq -c . | ndgeojson-lint

• You could use geojson-merge to create a single GeoJSON file/FeatureCollection, but this is tricky to do if you have more GeoJSON files than what your shell's argument length limits will allow..
• You could invoke geojsonhint on each individual GeoJSON file, but this is relatively slow for a large number of files.