How do you implement an OAuth2 Authorization Server in NestJS?

Q: How do you implement an OAuth2 Authorization Server in NestJS?

// npm i @nestjs/oauth2-server oauth2-server @Module({ imports: [ OAuth2Module.forRoot({ model: AppOAuth2Model, grants: ['authorization_code', 'refresh_token', 'client_credentials'], accessTokenLifetime: 3600, }), ], }) export class AppModule {} // OAuth2 model — implements the data layer for the authorization server @Injectable() export class AppOAuth2Model implements OAuth2Server.AuthorizationCodeModel { async getClient(clientId: string, clientSecret: string) { return this.clientsService.findByCredentials(clientId, clientSecret); } async saveAuthorizationCode(code, client, user) { return this.authCodeService.save({ code, client, user }); } async getAuthorizationCode(code: string) { return this.authCodeService.findByCode(code); } async revokeAuthorizationCode(code) { return this.authCodeService.delete(code.authorizationCode); } async saveToken(token, client, user) { return this.tokensService.save({ ...token, client, user }); } async getAccessToken(accessToken: string) { return this.tokensService.findByAccessToken(accessToken); } async verifyScope(token, scope: string[]) { return scope.every(s => token.scope.includes(s)); } } getClient() — validate client credentials and return the registered OAuth2 client. saveAuthorizationCode() / getAuthorizationCode() — persist and retrieve short-lived authorization codes. saveToken() / getAccessToken() — persist and retrieve access and refresh tokens. verifyScope() — confirm the requested scopes are included in the granted token scopes. Always hash client secrets before storing — treat them like passwords.

Difficulty: 8/10

OAuth2 flows, NestJS guards & strategies, Token storage & revocation

Use @nestjs/oauth2-server which wraps the oauth2-server library. Implement the OAuth2 model interface to provide data persistence for clients, tokens, and authorization codes. Register grants (authorization_code, client_credentials, refresh_token) in the module configuration.

OAuth2 module setup and model implementation

Authorization server implementation checklist:

1
getClient() — validate client credentials and return the registered OAuth2 client.

How do you implement an OAuth2 Authorization Server in NestJS?

Difficulty: 8/10

OAuth2 flows, NestJS guards & strategies, Token storage & revocation

Use @nestjs/oauth2-server which wraps the oauth2-server library. Implement the OAuth2 model interface to provide data persistence for clients, tokens, and authorization codes. Register grants (authorization_code, client_credentials, refresh_token) in the module configuration.

OAuth2 module setup and model implementation

Authorization server implementation checklist:

1
getClient() — validate client credentials and return the registered OAuth2 client.

How do you implement an OAuth2 Authorization Server in NestJS?

Use @nestjs/oauth2-server which wraps the oauth2-server library. Implement the OAuth2 model interface to provide data persistence for clients, tokens, and authorization codes. Register grants (authorization_code, client_credentials, refresh_token) in the module configuration.

How do you implement an OAuth2 Authorization Server in NestJS?

Use @nestjs/oauth2-server which wraps the oauth2-server library. Implement the OAuth2 model interface to provide data persistence for clients, tokens, and authorization codes. Register grants (authorization_code, client_credentials, refresh_token) in the module configuration.

Scenario Questions

Follow-up Questions