You are building an Express.js API and need to ensure that the API can only be accessed with a valid authentication token. How would you implement middleware to secure your API?

  • Use a middleware function to check the authentication token for each API route and grant access only if the token is valid.
  • Implement authentication within each route handler, verifying the token before processing the request.
  • Rely on HTTPS encryption to secure the API and avoid using authentication middleware.
  • Use a third-party authentication service to secure your API and handle token validation externally.
To secure an Express.js API with authentication, you should create a middleware function that checks the authentication token for each API route and grants access only if the token is valid. Centralizing authentication in middleware ensures consistent security across all routes. The other options are either less secure or less maintainable.
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