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Node.js Authentication Basics

Node.js Authentication Basics

Node.js authentication ensures only approved users access data.

Read Time
5 min read
Difficulty
Beginner
Last Updated
Jun 15, 2026
Version
v1.0.0

Introduction

Websites need to know exactly who is requesting data to keep accounts secure. Node.js typically uses JSON Web Tokens (JWT) to lock down routes. When a user logs in, they get a secure token that they must show every time they request private data.

Example

Example
1/* this creates a secure token */
2const jwt = require('jsonwebtoken');
3const token = jwt.sign({ userId: 123 }, 'secret_key', { expiresIn: '1h' });

Key Points

  • Authentication verifies user identity.
  • Authorization checks what data the user is allowed to see.
  • JWTs securely pass information between client and server.
  • Tokens eventually expire for security reasons.

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