validate jwts issued by auth0 in fastapi

validating json web tokens (jwt) issued by auth0 in a fastapi application involves several steps, including setting up your fastapi application, installing necessary libraries, and implementing the validation logic. below is a detailed tutorial to help you through this process.

prerequisites

1. **fastapi**: ensure you have fastapi installed. you can do this using pip:


step 1: set up your fastapi application

step 2: configure auth0 settings

step 3: create a token validation function

next, create a function to validate the jwt tokens. this function will decode the jwt and verify its expiration and audience.

step 4: create a dependency to protect routes

you can create a dependency that will use the `decode_jwt` function to validate the jwt for protected routes.

step 5: create protected routes

now, you can create a protected route that requires a valid jwt token.

step 6: run your fastapi application

finally, you can run your fastapi application using uvicorn.

step 7: testing the application

1. obtain a jwt token from auth0.
2. make a get request to the `/protected` endpoint with the token in the authorization header:

complete code example

conclusion

you have successfully created a fastapi application that validates jwt tokens issued by auth0. this setup enhances the security of your application by ensuring that only authenticated users can access certain routes. make sure to handle exceptions and errors ap ...

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