Making GET and POST Requests in Angular Interview Questions

Q1. How do you make a GET request with HttpClient?

Use the get method. Example:

this.http.get(''/api/users'').subscribe(users => this.users = users);

The get method is generic to specify the expected response type. It returns an Observable that you subscribe to.

Q2. How do you make a POST request?

Use the post method with the body. Example:

const newUser = { name: ''John'' };
this.http.post(''/api/users'', newUser).subscribe(user => console.log(user));

The second argument is the request body, which will be JSON-serialized.

Q3. How do you make PUT and DELETE requests?

PUT:

this.http.put(''/api/users/1'', updatedUser).subscribe();

DELETE:

this.http.delete(''/api/users/1'').subscribe();

Q4. How do you add headers to requests?

Use HttpHeaders and pass in options. Example:

const headers = new HttpHeaders().set(''Authorization'', ''Bearer token'');
this.http.get(''/api/users'', { headers }).subscribe();

Q5. How do you pass URL parameters?

Use HttpParams. Example:

const params = new HttpParams().set(''page'', ''1'').set(''sort'', ''name'');
this.http.get(''/api/users'', { params }).subscribe();

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