Ways to initialize a JSON configuration file for an Angular 2 module without relying on an http.get method

I have a single json file located at the root directory called config.json:

{ "base_url": "http://localhost:3000" }

Within my service class, I am looking to utilize it in this manner:

private productsUrl = config.base_url + 'products';

I have come across numerous articles offering solutions that either involve sending a http.get request to fetch the file and extract the variable or outdated methodologies for angular.js (angular 1).

I find it hard to believe there isn't a simpler way to incorporate this existing file without having to make an additional server request.

In my opinion, I would expect the bootstrapping function to provide such functionality, something like:

platformBrowserDynamic().bootstrapModule(AppModule, { config: config.json });

Although functional, this is not the most optimal solution:

export class Config {
  static base_url: string = "http://localhost:3004/";
}

You can then use it as needed:

private productsUrl = Config.base_url + 'products';

This method is not ideal as it requires creating the class (or updating properties) in a build script. This is exactly what I was hoping to avoid by using the config.json file.

Personally, I prefer the config.json approach as it is less invasive with the TypeScript compiler. Any suggestions on how to achieve this are greatly welcomed and appreciated!

Answer №1

Discover how to leverage System.js for loading JSON files within an Angular application.

Hats off to @eotoole for guiding me in the right direction.

If the method above seems confusing, simply integrate a map into the System.js configuration like so:

map: { 'plugin-json': 'https://unpkg.com/systemjs-plugin-json' }
*

*This involves using an external package

or

map: { 'plugin-json': 'plugin-json/json.js' }
**

**In case you download the plugin from:

the official System.js plugin repository

Now, I am able to utilize:

const config = require('./config.json');

anywhere in my application.

Given its endorsement by the "System.js" team, I have confidence in using it to load essential app settings such as base URL or different endpoints.

My next task is determining how to encapsulate this logic for testing purposes. Perhaps by requiring the file within its own class and swapping out values for specific test cases.

Answer №2

Is webpack a part of your development setup? If so, and you have the ability to simply add

const configuration = require('./config.json');

@Injectable()
export class CustomService {
   private settings:any = configuration;
   ....
}

to your webpack configuration, make sure to include the json-loader plugin:

  ...
  module: {
    ...
    loaders: [
      ...
      {
        test: /\.json$/,
        loaders: ["json-loader"]
      },
      ...
    ]
  }
  ...

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