Skip to main content

What is the difference between AOT and JIT Angular?

AOT (Ahead-of-Time) and JIT (Just-in-Time) are two compilation strategies used in Angular.


Ahead-of-Time (AOT) Compilation: In AOT, the Angular application is compiled during the build process and the compiled code is delivered to the browser. The advantage of AOT is that the application runs faster because the compiler has already transformed the code into JavaScript, making it easier for the browser to execute. Additionally, with AOT, the compiler can perform optimizations such as tree-shaking (eliminating unused code) and dead-code elimination. AOT also provides better security by preventing injection attacks, as the compiled code is less susceptible to tampering.

Ahead-of-Time (AOT): Compiles your application and libraries at build time. This is the default starting in Angular 9.

 

Just-in-Time (JIT) Compilation: In JIT, the Angular application is compiled in the browser, during runtime. This means that the application is compiled just before it is executed. The advantage of JIT is that it is easier to debug because the source code is available in the browser. Additionally, JIT makes it easier to develop and test the application, as changes can be made and tested without having to rebuild the application.

Just-in-Time (JIT): Compiles your application in the browser at runtime. This was the default until Angular 8.

 In general, AOT is recommended for production environments, while JIT is more suited for development and testing.


JIT vs. AOT Compilation

The Angular compiler converts our applications code (HTML and TypeScript) into JavaScript code before browser downloads and runs that code.

 JIT (Just-in-Time) -

1.         JIT compiles our app in the browser at run-time.

2.         Compiles before running

3.         Each file compiled separately

4.         No need to build after changing our app code and it automatically reflects the changes in your browser page

5.         Highly secure

6.         Very suitable for local development

 

AOT (Ahead-of-Time) -

1.         AOT compiles our app code at build time.

2.         Compiles while running

3.         Compiled by the machine itself, via the command line (Faster)

4.         All code compiled together, in-line HTML/CSS in the scripts

5.         Highly secure

6.         Very suitable for production builds

By Anil Singh | Rating of this article (*****)

Popular posts from this blog

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...

How To convert JSON Object to String?

To convert JSON Object to String - To convert JSON Object to String in JavaScript using “JSON.stringify()”. Example – let myObject =[ 'A' , 'B' , 'C' , 'D' ] JSON . stringify ( myObject ); ü   Stayed Informed –   Object Oriented JavaScript Interview Questions I hope you are enjoying with this post! Please share with you friends!! Thank you!!!

Encryption and Decryption Data/Password in Angular

You can use crypto.js to encrypt data. We have used 'crypto-js'.   Follow the below steps, Steps 1 –  Install CryptoJS using below NPM commands in your project directory npm install crypto-js --save npm install @types/crypto-js –save After installing both above commands it looks like  – NPM Command  1 ->   npm install crypto-js --save NPM Command  2 ->   npm install @types/crypto-js --save Steps 2  - Add the script path in “ angular.json ” file. "scripts" : [                "../node_modules/crypto-js/crypto-js.js"               ] Steps 3 –  Create a service class “ EncrDecrService ” for  encrypts and decrypts get/set methods . Import “ CryptoJS ” in the service for using  encrypt and decrypt get/set methods . import  {  Injectable  }  from ...

Angular Testing Questions and Answers | 9, 8, 7, 6

What Is Testing? The testing is a tools and techniques for a unit and integration testing Angular applications . Why Test? Tests are the best ways to prevent software bugs and defects. How to Setup Test in Angular Project? Angular CLI install everything you need to test an Angular application. This CLI command takes care of Jasmine and karma configuration for you. Run this CLI command- ng test The test file extension must be “.spec.ts” so that tooling can identify the test file. You can also unit test your app using other testing libraries and test runners. Types of Test – The all great developer knows his/her testing tools use. Understanding your tools for testing is essential before diving into writing tests. The Testing depends on your project requirements and the project cost. The types of Testing looks like - 1.       Unit Test 2.       Integration Test 3.       En...