Angular4: how do access local json?

Question

In Angular2 you could have a folder /data/ and a json file there and you could access it at localhost:4200/data/something.json.

This is no longer possible in Angular

Answer 1

You can use "require" too;

let test = require('./test.json');

Answer 2

Based on this post, here is complete answer for Angular 6+:

From angular-cli doc, json can be considered as assets and accessed from standard import without use of ajax request.

Let's suppose you add your json files into "your-json-dir" directory:

1. add "your-json-dir" into angular.json file (:

   "assets": [ "src/assets", "src/your-json-dir" ]

2. allow import of json modules into typings.d.ts file to prevent from typescript errors:

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

3. in your controller/service/anything else file, simply import the file by using this relative path:

   import * as myJson from 'your-json-dir/your-json-file.json';

Answer 3

I figured it out.

In Angular2 I had the folder under the src folder. In Angular4 you have to have it in the root folder.

Example:

Angular2:

root / src / data / file.json

Angular4:

root / data / file.json

Answer 4

you can use this code

@Injectable()
export class AppServices{

    constructor(private http: Http) {
         var obj;
         this.getJSON().subscribe(data => obj=data, error => console.log(error));
    }

    public getJSON(): Observable<any> {
         return this.http.get("./file.json")
                         .map((res:any) => res.json())
                         .catch((error:any) => console.log(error));

     }
}

here file.json is your local json file.

see here also

• How to get a json file in angular2 using the Http class

also see the changlog of angular-cli for path

• https://github.com/angular/angular-cli/blob/master/CHANGELOG.md#100-rc4-2017-03-20

Answer 5

You could add your folder location under Assets tag in angular.json

"assets": [
          "src/favicon.ico",
          "src/assets",
          "src/api"
        ],

Answer 6

I was facing the same issue, where my Observable Angular service was located at inside 'src/app/' folder and it was trying to load a local JSON file. I tried to put the JSON file inside the same app folder, inside a new 'api' folder, used various kinds of relatives/absolute routes, but it didn't help and I got 404 error. The moment I put it inside 'assets' folder, it worked. I guess there is more to it?

Maybe this link helps:

COMPONENT-RELATIVE PATHS IN ANGULAR