In NativeScript, the http module doesn't currently support making network requests to the local file system. That work is intended to be done by the file reader. It's pretty simple to read a local file and parse its contents as JSON.

This is the TypeScript/Promise version of what Emil Oberg created for the same question on StackOverflow. This module should be reusable for any and all asyncronous local JSON read operations.

import * as fs from 'file-system';

var documents = fs.knownFolders.currentApp();

class FileReader {

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

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