How to Cache HTTP Requests In Angular

How to Cache HTTP Requests In Angular

Get to know how to cache http requests in Angular with this comprehensive tutorial. Best practices and tips to cache Http requests properly in Angular.

Table of Content

Angular is a great choice for any large scale enterprise projects because it is opinionated and brings the whole team together on many things. It is like having a headstart for your development team. Though angular has so many things defined, still there are some things that you have to figure out on your own.

One such thing is caching HTTP requests, as per the famous quote by Phil Karlton,

“There are only two hard things in Computer Science: cache invalidation and naming things.”, Caching things is very easy but clearing the cache is difficult. We are going to see an approach that puts you in control of both caching an HTTP request and invalidating the cache.

First, let’s define a property in your service which caches the result of the HTTP request

data-sheets-value="{"1":2,"2":"private userList$: Observable;"}" data-sheets-userformat="{"2":513,"3":{"1":0},"12":0}">private userList$: Observable;

I’m using any type here for the sake of example, in real-world applications you should not be using any type like this. Now let us write the service method that makes the HTTP request.

public getUsers$(): Observable {

if (!this.userList$) {

this.userList$ = this.httpClient.get('/users');


return this.userList$;


The above code is pretty self-explanatory, we are checking if the observable is already defined and if it isn’t we are making the HTTP call and then store the reference in the member observable we created. Next time this function gets called, the existing reference to the observable will be returned without actually making a fresh HTTP call.

angular http development coding

Bootstrap 5 Complete Course with Examples

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

Building a simple Applications with Vue 3

Deno Crash Course: Explore Deno and Create a full REST API with Deno

How to Build a Real-time Chat App with Deno and WebSockets

Convert HTML to Markdown Online

HTML entity encoder decoder Online

How long does it take to develop/build an app?

This article covers A-Z about the mobile and web app development process and answers your question on how long does it take to develop/build an app.

Developer Career Path: To Become a Team Lead or Stay a Developer?

For a developer, becoming a team leader can be a trap or open up opportunities for creating software. Two years ago, when I was a developer, ... by Oleg Sklyarov, Fullstack Developer at Skyeng company

AngularJS App Development Company in USA&India |Hire Angular Developers

Biz4Solutions is a leading AngularJS App development company in USA & India and provides apps to the client with our expert team of Angular developers

Install Angular - Angular Environment Setup Process

Install Angular in easy step by step process. Firstly Install Node.js & npm, then Install Angular CLI, Create workspace and Deploy your App.

Is Low-code or no-code development is future of mobile app development

Mobile app development has skyrocketed over these years with the increasing demand of mobile apps for a variety of purposes like entertainment, banking, weather update, health, booking movie tickets, booking a taxi etc. With the latest...