Handling JWT Token Expiration in Angular 17 — A Comprehensive Guide

Introduction

In this tutorial, we delve into a pivotal aspect of modern web applications: effectively managing JWT token expiration in Angular 17. Ensuring a secure and smooth user experience hinges on this critical functionality.

Deep Dive into JWT

JWT (JSON Web Token) is a URL-safe method for transmitting information, particularly used for authentication. It comprises three segments:

• Header: Contains token type and algorithm.
• Payload: Holds the claims or data.
• Signature: Ensures the token’s integrity.

Before proceeding, verify your Angular version with ng version to ensure compatibility with Angular 17.

Starting with Angular

Create a new project using ng new [project-name].

Step-by-Step JWT Expiration Handling

Step 1: Setting Up JWT Decode

Install the JWT Decode package with:

npm install jwt-decode

This allows you to decode and inspect your JWT tokens.

Step 2: Creating an Interceptor