Angular is a well-liked and widely used framework for building dynamic web applications. It offers developers numerous features and functionalities which not only reduce the challenges and complexity associated with web development but also provide tools to help with building front-end components for web applications. One of the features Angular provides developers to help work with APIs is the HTTP module.

The HTTP module is an Angular module that provides developers with a collection of services and tools that allow them to send HTTP requests, as well as handle HTTP responses. One of the HTTP request types developers use most often is the POST request. In this article, we’ll take a look at an Angular HTTP POST example, which can help simplify the task of posting data to an API, and also help address some frequently asked questions.

### Angular HTTP POST Example

To demonstrate how to use Angular’s HTTP module to POST data to an API endpoint, we’ll set up a simple example. Our example will use a simple HTML form having two input fields: username and password. When the user submits the form, we’ll send an HTTP POST request to the API endpoint along with the entered data, and display the response message on the screen.

In this example, we’ll use a service to encapsulate the HTTP POST request logic. This makes the code more modular and maintainable. Here’s a step-by-step approach to creating the Angular HTTP POST example.

###### Step 1: Set up a new Angular project

To set up a new Angular project, we’ll make use of the Angular CLI. Open a command prompt and enter the following command:

ng new angular-http-post-example

###### Step 2: Create a new component

We need to create a new component that will render the HTML form and encapsulate the HTTP POST request logic. Open a command prompt and enter the following command:

cd angular-http-post-example
ng generate component login-form

###### Step 3: Set up the HTML template

Open the newly created login-form.component.html file and add the following markup to create the form:


[(ngModel)]=”password” name=”password” required>



In the template, we’ve created a form with two input fields: username and password. We’ve also added a submit button and a message div to display the API response.

We’re using two-way data binding using ngModel in the template. This allows us to bind the form inputs’ values with the variables username and password.

We’ve also added an ngIf directive to hide the message div until we receive a response from the server.

###### Step 4: Design the component class

We’ll now create a component class that will hold the data and methods to handle the form submission and the HTTP POST request. Open login-form.component.ts and add the following code:

import { Component } from ‘@angular/core’;
import { HttpClient, HttpErrorResponse } from ‘@angular/common/http’;

selector: ‘app-login-form’,
templateUrl: ‘./login-form.component.html’,
styleUrls: [‘./login-form.component.css’]
export class LoginFormComponent {
username = ”;
password = ”;
message = ”;

constructor(private http: HttpClient) {}

onSubmit(): void {
const data = { username: this.username, password: this.password };‘’, data)
next: response => {
this.message = `Welcome, ${}!`;
error: (err: HttpErrorResponse) => {
this.message = err.error.message;

In the component class, we’ve defined three class variables: username and password to hold the user input, and message to display the API response message.

We’re using the constructor to create an instance of the HttpClient service provided by Angular. This service gives our component access to the HTTP module’s functionalities.

We’ve also created the onSubmit() method, which gets called when the user submits the form. Within the onSubmit() method, we’re creating a data object with the user input values and sending an HTTP POST request to our API endpoint using the HttpClient service.

The post method returns an observable object that we’re subscribing to with an object that contains two methods: next and error. When the response is received from the API, the next() method sets the message variable to the response message. If an error occurs, the error() method sets the message variable to the error message.

###### Step 5: Style the component

Lastly, we’ll add some CSS styling to the component to make it look nicer. Open login-form.component.css and add the following code:

form {
margin: 0 auto;
width: 300px;
padding: 20px;
border: 1px solid #ccc;
border-radius: 5px;
form div {
margin-bottom: 10px;
form input[type=”text”],
form input[type=”password”] {
padding: 5px;
border-radius: 3px;
border: 1px solid #ccc;
width: 100%;
form button {
margin-top: 10px;
background-color: #4CAF50;
color: white;
border: none;
padding: 10px 20px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 14px;
border-radius: 5px;
cursor: pointer;
p {
margin-top: 10px;
font-size: 14px;

This styling adds some padding, border, and background color to the form and button. It also adds some margin to separate the input fields and message.

### Frequently Asked Questions (FAQs)

Here are some frequently asked questions related to Angular HTTP POST requests:

#### Q. What’s the difference between GET and POST requests?

GET and POST are two common HTTP requests used for communicating with web servers.

GET requests are used to retrieve data from the server and have no body. It converts data to URL-encoded text and appends it to the URL as query parameters. GET requests are best used for reading data from the server.

POST requests, on the other hand, are used to send data to the server and have a body. The data sent to the server is usually in the JSON format. POST requests are best used for creating, updating, or deleting data on the server.

#### Q. How can I send headers along with the HTTP POST request?

You can send headers along with your HTTP POST request using the HttpHeaders class provided by the Angular HTTP module. Here’s an example:

const options = {
headers: new HttpHeaders({
‘Content-Type’: ‘application/json’,
‘Authorization’: ‘Bearer abc123’
};‘’, data, options).subscribe( … );

In the example above, we’ve created an options object that contains HTTP headers. We’ve set the headers to have a content-type of application/json and an authorization header with the value Bearer abc123.

#### Q. What’s an HTTP interceptor and how can I use it in my Angular project?

HTTP interceptors are used to modify HTTP requests and responses on the fly. They act as middleware between the Angular HTTP module and the server. You can use an HTTP interceptor to add headers to all HTTP requests, handle errors, or add authentication tokens.

Here’s an example of an HTTP interceptor that adds an authorization header to every outgoing HTTP request:

import { Injectable } from ‘@angular/core’;
import { HttpInterceptor, HttpHandler, HttpRequest } from ‘@angular/common/http’;

export class AuthInterceptor implements HttpInterceptor {
intercept(request: HttpRequest, next: HttpHandler) {
const authToken = ‘abc123’;
const authRequest = request.clone({
headers: request.headers.set(‘Authorization’, ‘Bearer ‘ + authToken)
return next.handle(authRequest);

This interceptor gets the authentication token from a variable and adds it to every outgoing HTTP request’s authorization header using the headers method.

You can apply this interceptor globally in your project by providing it in the AppModule’s providers array.

import { HTTP_INTERCEPTORS } from ‘@angular/common/http’;
import { AuthInterceptor } from ‘./auth.interceptor’;

imports: [ … ],
providers: [
useClass: AuthInterceptor,
multi: true
bootstrap: [ … ]
export class AppModule { }

In this example, we’ve provided the AuthInterceptor class to HTTP_INTERCEPTORS multi-providers, which allows it to work globally in our project.

In conclusion, the Angular HTTP module is an essential feature that any web application developer should be familiar with. It simplifies communications with servers, thus lowering the complexity of building applications with robust API functionality. By following the example and frequently asked questions detailed above, your project can quickly establish and send an HTTP POST request.

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