Instruction: Describe the process of securing a Node.js REST API using OAuth2, including the flow and necessary components.
Context: Candidates are expected to detail how OAuth2 can be integrated into Node.js REST APIs for security, discussing the authentication flow, tokens, and how to protect routes.
Official answer available
Preview the opening of the answer, then unlock the full walkthrough.
First and foremost, OAuth2 is an authorization framework that enables applications to obtain limited access to user accounts on an HTTP service. It works by delegating user authentication to the service that hosts the user account and authorizing third-party applications to access the user account. OAuth2 specifies four roles: the resource owner, the client, the authorization server, and the resource server.
In the context of a Node.js REST API, implementing OAuth2 usually begins with setting up an OAuth2 server. This can be done using various libraries available in the Node.js ecosystem, such as oauth2-server or node-oauth2-server. The OAuth2 server acts as the authorization server in the OAuth2 flow and is responsible for handling client registration, issuing access tokens, and authorizing requests....