What is the best approach to accessing and reading a JSON file within an Angular 12 application?

Question

What is the best approach to accessing and reading a JSON file within an Angular 12 application?

I've been attempting to retrieve data from a local JSON file that holds configuration information for my application. Every time I run the ng build command in the Angular CLI, I encounter an error.

The TypeScript document related to my component: my-component.ts

...
import credentials from './config/credentials.json';

export class MyComponent implements OnInit {
    ...
    // Properties
    username: string = credentials.username;
    ...
}

The JSON configuration file, located at '/config': credentials.json

{
    "credentials" : {
        "username" : "my_user_name",
        ...
    }
}

The error message states:

Error: Should not import the named export 'credentials' (imported as 'credentials') from default-exporting module (only default export is available soon)

What could be causing this issue? It appears similar to the problem reported here.

javascript json angular typescript

Answer 1

Answer №1

If you're working with Angular version 12, there are a couple of extra steps you'll need to follow.

Firstly, make sure to update your file by adding certain lines. If you're unsure about what needs to be added, you can check out this related question on Stack Overflow. It's important to note that the changes for version 12 are different from those for version 11.

{
    ...
        "compilerOptions": {
            ...
            "resolveJsonModule": true, // include this line...
            "esModuleInterop": true, // as well as this one...
            ...
        },
    ...
    "allowSyntheticDefaultImports": true // also add this line outside of "compiler options"
}

Secondly, remember to introduce a let statement into your code. Simply adding the lines above may not suffice; incorporating this additional step helped resolve the issue. For further guidance, you can refer to this particular blog post.

In my case, I implemented these changes in the TypeScript file for my component named 'my-component.ts'.

...
import credentials from './config/credentials.json';

let my_username = credentials.username;  // THIS NEW LINE IS VITAL

export class MyComponent implements OnInit {
    ...
    // Data
    username: string = my_username; // APPLY THE NEW VARIABLE HERE
    ...
}

Although the exact reasoning behind why this solution works might not be entirely clear, it does indeed work. An additional resource like the source mentioned here hints at potential insights pertaining to variable scoping.

Answer 2

If you're working with Angular version 12, there are a couple of extra steps you'll need to follow.

Firstly, make sure to update your file by adding certain lines. If you're unsure about what needs to be added, you can check out this related question on Stack Overflow. It's important to note that the changes for version 12 are different from those for version 11.

{
    ...
        "compilerOptions": {
            ...
            "resolveJsonModule": true, // include this line...
            "esModuleInterop": true, // as well as this one...
            ...
        },
    ...
    "allowSyntheticDefaultImports": true // also add this line outside of "compiler options"
}

Secondly, remember to introduce a let statement into your code. Simply adding the lines above may not suffice; incorporating this additional step helped resolve the issue. For further guidance, you can refer to this particular blog post.

In my case, I implemented these changes in the TypeScript file for my component named 'my-component.ts'.

...
import credentials from './config/credentials.json';

let my_username = credentials.username;  // THIS NEW LINE IS VITAL

export class MyComponent implements OnInit {
    ...
    // Data
    username: string = my_username; // APPLY THE NEW VARIABLE HERE
    ...
}

Although the exact reasoning behind why this solution works might not be entirely clear, it does indeed work. An additional resource like the source mentioned here hints at potential insights pertaining to variable scoping.

What is the best approach to accessing and reading a JSON file within an Angular 12 application?

Answer №1

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