BigQuery requires new-line delimited JSON files where the geometry column is single string.

convertGeoJsonToBq.js

// https://medium.com/google-cloud/how-to-load-geojson-files-into-bigquery-gis-9dc009802fb4
// Javascript (NodeJS) vs Python
function convertGeoJsonBq() {
  const fs = require('fs');

  fs.readFile(process.argv[1], 'utf8', (err, data) => {
    if (err) throw err;

    const geojson = JSON.parse(data);
    const features = geojson.features;

    const output = features.map((feature) => {
      const props = feature.properties;
      props.geometry = JSON.stringify(feature.geometry);

      if (!schema) {
        schema = Object.keys(props).map((key) => {
          if (key === 'geometry') {
            return 'geometry:GEOGRAPHY';
          } else if (typeof props[key] === 'string') {
            return key;
          } else {
            return `${key}:${typeof props[key] === 'number' ? 'float64' : 'int64'}`;
          }
        }).join(',');
      }

      return props;
    });

    const schema = Object.keys(output[0]).join(',');

    fs.writeFile('to_load.json', JSON.stringify(output, null, 2), (err) => {
      if (err) throw err;
      console.log('Schema: ', schema);
    });
  });
}