How to pass an array as parameters in an Angular HTTP GET request to an API

Hey there! I'm relatively new to Angular and I've hit a roadblock. I need to send an array as parameters to a backend API, which specifically expects an array of strings.

 const params = new HttpParams();
 const depKey = ['deploymentInprogress', 'deploymentMessage'];
 params.append('depKey', JSON.stringify(depKey));

 this.http.get(uri, { params: params })
      .pipe(
        take(1),
        catchError((error) => {
          return throwError(error);
        })
      ).subscribe(data => {

   })
 

The code snippet above didn't yield the desired outcome. I'm seeking assistance on how to properly pass an array of strings as parameters to our backend API.

Answer №1

To achieve this, you may follow the below steps:

const parameters = new HttpParams();
 const keys = ['deploymentInprogress', 'deploymentMessage'];
 parameters.append('depKey', keys.join(', ');

 this.http.get(uri, { params: parameters }).....

Answer №2

To effectively communicate with the API, you can send each array value individually using the same parameter name for easy reading by the API.

 const parameters = new HttpParams();
 const arrayKeys = ['key1', 'key2'];
 arrayKeys.forEach((element: any) => {
     parameters.append('arrayKey', element);
 });

 this.http.get(apiUri, { params: parameters })
      .pipe(
        take(1),
        catchError((error) => {
          return throwError(error);
        })
      ).subscribe(responseData => {

   })

Answer №3

Understanding the backend API specifications is crucial. Without this information, attempting to make it work would be mere speculation.

Oftentimes, these specifications are contained in the body and can take various forms, such as:

{ 
   "key": "value",
   "items": [
      {"aaa":"bbb","ccc":"dddd"},
      {"aaa":"fff","ccc":"hhhh"}
   ]
}

However, it's important to note that this is just one possible format!

If you provide us with your specific requirements, we can offer assistance tailored to your needs.

Do you happen to have a Postman example illustrating how to interact with the endpoint?

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