GraphQL Authentication adds a JWT authentication layer to your Craft CMS GraphQL endpoint.

• Adds support for user registration and authentication (see Authentication)
• Adds support for social sign-in – currently Google, Facebook, Twitter, and Apple (see Social)
• Adds ability to define per-section user restrictions (queries and mutations can be limited to author-only) (see User Settings)
• Checks mutation fields against schema permissions, and prevents fields being saved if user is trying to access private entries/assets
• Adds ability to assign unique schemas for each user group
• Adds ability to restrict user queries and mutations to Craft multi-site sites
• Adds ability to mark fields as private – stopping users from querying/mutating fields on entries
• Adds a unique, per-user query cache

You can view the documention for the plugin here.