Instructions on how to access a JSON file in an angular-cli npm test by importing it

With Angular version 4.2.4 and angular-cli at version 1.1.3, the code snippet below is used:

import languagesJsonRaw from './languages/en.json';
import countriesJsonRaw from './countries/en.json';

export const languages = prepareLanguages(languagesJsonRaw);
export const countries = prepareCountries(countriesJsonRaw);

Upon running npm start (which triggers ng serve), both languages and countries are accessible in the application.

However, when executing npm test, specifically via:

ng test --reporters dots,html --browsers Chrome --watch

The variables languagesJsonRaw and countriesJsonRaw turn out to be undefined.

How can I ensure that these files are also available to the test runner? No additional steps were required for them to work with ng serve or ng build, even with AOT enabled.

This is a standard angular-cli project, so it's likely using karma as the test runner.

Github Issue: https://github.com/angular/angular-cli/issues/6786

angulartypescriptkarma-runnerangular-cli

Answer №1

To enable the loading of modules with a .json extension, add the code below to your src/typings.d.ts file:

declare module "*.json" {
  const value: any;
  export default value;
}

By adding this snippet, you'll be able to import and use JSON modules in your TypeScript projects.

If you want more detailed information, check out this article:

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