How do I fix a 401 unauthorized status code

Question

Can you tell me with the help of cod and an example How do I fix a 401 unauthorized status code?

Answer 1

A 401 Unauthorized status code means the request lacks valid authentication credentials. Here’s how to fix it:

1. Check API Credentials

Ensure the correct API key, token, or credentials are being used.

Example (Bearer Token in Angular):

const headers = { Authorization: `Bearer YOUR_ACCESS_TOKEN` };

this.http.get('https://api.example.com/data', { headers }).subscribe();

2. Use an HTTP Interceptor for Authentication

Automatically attach tokens to requests:

intercept(req: HttpRequest<any>, next: HttpHandler) {

  const authReq = req.clone({

    setHeaders: { Authorization: `Bearer YOUR_ACCESS_TOKEN` }

  });

  return next.handle(authReq);

}

3. Handle Token Expiry

If using JWT, refresh the token when expired.

Store and retrieve tokens securely (e.g., from localStorage or cookies).

4. Verify API Endpoint & CORS

Check if the correct API URL is used.

Ensure CORS allows authentication headers.

5. Check User Permissions

Ensure the user has the necessary roles/permissions.