overpass-frontend/src/isFileURL.js

A JavaScript (NodeJS/Browser) library to easily access data from OpenStreetMap via Overpass API or from an OSM File. The objects can directly be used with LeafletJS or exported to GeoJSON. Data will be cached in the browser memory.

module.exports = (url) => {
  if (url && url.match(/^data:/)) {
    return true
  }

  if (!url || url.match(/\/\/[^/]+$/)) { // url without path
    return false
  }

  if (url.match(/\/[^/.]+$/)) { // last url part without '.'
    return false
  }

  if (url.match(/\.(php)(\?.*)?$/)) { // php script -> assume server
    return false
  }

  return true
}