Angular Signals with HttpClient – Fetch API Data Using Signals

In this tutorial, you’ll learn how to use Signals with HttpClient step by step.

In Modern Application, we get data from the API. Traditionally, in Angular, developers used RxJS with HttpClient.

You can store and update API data through Signals.

Why Use Signals with HttpClient?

There are many benefits to using Signals with HttpClient

1. Signals are used for reactive UI updates.

2. Signals are used for cleaner state management.

3. Less boilerplate code.

4. Signals are used for Better performance.

Signals help automatically update the UI when the data changes.

Basic Example: Fetch API Data Using Signals

Step 1: Firstly, Import the Required Modules

import { Component, signal } from '@angular/core';
import { HttpClient } from '@angular/common/http';

Step 2: Now, you will create a Signal to Store API Data

users = signal([]);

Step 3: Fetch Data with HttpClient

constructor(private http: HttpClient) {}

loadUsers() {
  this.http.get('https://jsonplaceholder.typicode.com/users')
    .subscribe(data => {
      this.users.set(data);
    });
}

The user’s signal will store the API response.

Step 4: Display Data in Template

<ul>
  <li *ngFor="let user of users()">
    {{user.name}}
  </li>
</ul>

Note: When we get the API data, then users’ signal updates automatically, and the UI refreshes.

Signals vs RxJS with HttpClient Comparison

When to Use Signals with HttpClient

Signals:

There are many benefits to using Signals

1. You should use signals when managing API data inside components.

2. You should use signals when creating reactive UI updates.

3. You should use signals when simplifying state management.

RxJS:

There are many benefits to using RxJS

1. You should use RxJS for complex asynchronous streams.

2. You should use RxJS when making multiple API calls.

3. You should use RxJS when advanced reactive pipelines

Conclusion

Signals: It is used for API data handling and improves UI reactivity. Signals provide a modern and cleaner way to manage application state.

RxJS: It is used for complex async flows.