---
title: "Create an Express.js server route to handle user login authentication using JWT (JSON Web Tokens)."  
description: "Create an Express.js server route to handle user login authentication using JWT (JSON Web Tokens)."  
author: "Steilla Mitchel"  
published: 2023-07-26  
updated: 2023-07-27  
canonical: https://www.mindstick.com/forum/159294/create-an-express-js-server-route-to-handle-user-login-authentication-using-jwt-json-web-tokens  
category: "javascript"  
tags: ["javascript", "authentication", "express js"]  
reading_time: 2 minutes  

---

# Create an Express.js server route to handle user login authentication using JWT (JSON Web Tokens).

Create an Express.js [server](https://www.mindstick.com/articles/43769/what-is-serverless-architecture-is-it-worth-switching-over) [route](https://www.mindstick.com/interview/396/what-is-routed-event-in-wpf) to [handle user](https://www.mindstick.com/forum/158690/how-can-you-handle-user-interactions-such-as-button-clicks-using-jquery) [login](https://www.mindstick.com/articles/12852/styles-login-form-in-android) [authentication](https://www.mindstick.com/blog/177/authentication-and-authorization-in-asp-dot-net) using JWT (JSON [Web Tokens](https://www.mindstick.com/forum/159980/how-can-you-implement-authentication-using-jwt-json-web-tokens-in-a-node-js-application)).

## Replies

### Reply by Aryan Kumar

Yes, Express JS server routes can be used to [handle](https://www.mindstick.com/articles/311004/suede-skillet-handle-cover) [user login](https://www.mindstick.com/forum/549/what-is-the-benfit-of-given-the-microsoft-account-when-we-create-a-user-login-in-windows-8) authentication using JSON Web [Tokens](https://answers.mindstick.com/qa/92537/what-are-tokens) (JWT). Here is an example of a login route that uses JWT authentication:

JavaScript

```plaintext
const express = require("express");
const jwt = require("jsonwebtoken");

const app = express();

const SECRET_KEY = "my-secret-key";

app.post("/login", (req, res) => {
  const { email, password } = req.body;

  // Check if the user exists and the password is correct.
  if (email === "johndoe@example.com" && password === "password") {
    // Create a JWT token.
    const token = jwt.sign({ email }, SECRET_KEY, { expiresIn: "1h" });

    // Return the token to the client.
    res.json({ token });
  } else {
    // Return an error message.
    res.status(401).json({ error: "Invalid credentials" });
  }
});

app.listen(3000);
```

This route first checks if the user exists and the password is correct. If the user credentials are valid, a JWT token is created and returned to the client. The JWT token can then be used to authenticate the user on subsequent requests.

The `SECRET_KEY` constant is a secret key that is used to sign the JWT token. This key should be kept secret and should not be shared with anyone.

The `expiresIn` option specifies how long the JWT token will be valid for. In this example, the token will expire after 1 hour.

The `jsonwebtoken` module is used to create and verify JWT tokens. This module is available as a package on npm.


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Original Source: https://www.mindstick.com/forum/159294/create-an-express-js-server-route-to-handle-user-login-authentication-using-jwt-json-web-tokens

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