Implement an Express.js authentication middleware to protect routes from unauthorized access.
Implement an Express.js authentication middleware to protect routes from unauthorized access.
13026-Jul-2023
Updated on 27-Jul-2023
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Implement an Express.js authentication middleware to protect routes from unauthorized access.
Aryan Kumar
27-Jul-2023Sure, here is an example of how you can implement an Express.js authentication middleware to protect routes from unauthorized access:
JavaScript
This middleware first checks the
authorization
header in the request. If the header is not present, the middleware returns a401 Unauthorized
response.If the header is present, the middleware extracts the token from the header and decodes it using the
jwt
library. Thedecode()
method returns an object containing the decoded token, including the user's ID.The middleware then stores the user's ID in the
req.user
property. This property can then be accessed by other middleware or routes to check if the user is authorized to access the resource.Finally, the middleware calls the
next()
function to continue the request processing.To use this middleware, you would need to add it to your Express application. For example, you could add it to the
app.use()
method:This would add the middleware to all routes in the application. You could also add the middleware to specific routes by using the
app.route()
method:This would add the middleware to the
/protected
route only.