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Start with authentication and authorization
Authentication establishes who is making a request; authorization determines what that caller may do. NestJS treats authorization as separate from authentication, so a valid login must not automatically grant access to every route or record. Use guards and application policy to enforce permissions on the requested action and, where applicable, the specific resource. NestJS authorization documentation
Choose an authentication flow for your clients
The current NestJS authentication guide describes sessions, password hashing, email verification and reset flows, TOTP, OpenID Connect, access and refresh tokens, and API keys. Which option fits depends on the clients, revocation needs, and state-management design; the guide does not prescribe one mechanism for every API. Check the package and feature compatibility against the NestJS version you have installed rather than assuming older Passport/JWT tutorials and the newer documented authentication package are interchangeable. NestJS authentication documentation
| Decision | What to weigh |
|---|---|
| Cookie session or bearer token | Browser cross-site exposure and CSRF posture; server-side revocation and state management; client type; token lifetime and refresh design; and where session or token-related state is stored. NestJS documents both sessions and access/refresh tokens but does not designate a universal choice. NestJS authentication documentation NestJS CSRF documentation |
| Broad roles or resource/action policies | Whether a role expresses the real permission, how ownership and tenant boundaries are checked, and how policy changes are audited. A role guard is a starting point, not a substitute for checks tied to the requested record or action. NestJS authorization documentation |
Keep authentication state and recovery paths operational
The application remains responsible for loading users, marking public routes, and implementing any persistence store it needs. For production, NestJS’s guide calls out durable stores that work across instances, HTTPS, secrets kept in a secret manager, real email delivery, and searchable authentication audit events. Treat password-reset and verification links carefully: the guide recommends consuming them through a POST flow rather than automatically on GET, since email scanners may follow links. NestJS authentication documentation
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Authorize each request, not just the login
NestJS demonstrates role-based guards, while noting that roles may come from a database or an external identity provider. Attach the appropriate guard or policy to protected operations, and make the authorization decision using the caller and the resource being accessed. For example, permission to update one user’s profile should not be inferred merely from permission to reach a general profile route. NestJS authorization documentation
Keep the policy in runtime code authoritative. OpenAPI annotations can describe security requirements to API consumers, but documentation declarations do not enforce guards or permissions. NestJS supports defining schemes with DocumentBuilder and describing operation security with decorators such as @ApiSecurity(); make those declarations match the actual runtime policy. NestJS OpenAPI security documentation
Validate input and constrain sensitive operations
Validate and constrain request data at the API boundary before using it in application operations. Separately, apply request limits where abuse or repeated attempts carry meaningful risk—especially sign-in and account recovery. There is no single threshold that is appropriate for every endpoint or user population.
Rate-limit by risk, not by habit
NestJS’s @nestjs/throttler uses a maximum request limit within a configured ttl measured in milliseconds. Select both values according to endpoint sensitivity, normal traffic, false-positive cost, and the recovery path for a legitimate user who is blocked. NestJS rate-limiting documentation
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For sign-in, an IP-only limit can miss one client distributing attempts across many accounts and can penalize many legitimate users sharing one address. NestJS’s authentication walkthrough illustrates tracking both a normalized email address and the IP when a request identifies an account. Treat that as a strategy to adapt—not a universal threshold or a complete anti-abuse system. In a multi-instance deployment, choose tracking and storage that apply consistently across instances. NestJS authentication documentation NestJS rate-limiting documentation
Configure CORS for the clients you intend to support
Enable CORS using app.enableCors() or application creation options, and define allowed origins for the actual browser clients. NestJS delegates CORS behavior to the selected HTTP adapter’s library, so verify the policy with the adapter used in production. CORS governs browser access to cross-origin responses; it is not authentication, authorization, or a barrier that prevents non-browser clients from sending requests. NestJS CORS documentation
| Adapter | Documented default allowed methods | Configuration implication |
|---|---|---|
| Express | GET, HEAD, PUT, PATCH, POST, DELETE | Set an explicit origin policy appropriate to the clients, and review the methods needed by the API. NestJS CORS documentation |
| Fastify | GET, HEAD, POST | Explicitly allow PUT, PATCH, or DELETE if cross-origin clients use those methods. NestJS CORS documentation |
Protect cookie-authenticated state changes against CSRF
For NestJS 12.1 or later, the documented app.enableCsrfProtection() feature checks Sec-Fetch-Site or Origin; it is not a token-based CSRF scheme. The checks do not cover GET, HEAD, or OPTIONS, so those handlers should not change state. Cookie sessions also require deliberate SameSite and trusted-origin choices. NestJS CSRF documentation NestJS authentication documentation
Account for proxies and middleware order
Proxy behavior can affect the Host value used in origin checks. If a reverse proxy rewrites Host, preserve it or configure trusted origins as appropriate. Review CORS registration order as well, so a request rejected by CSRF protection receives the CORS headers your browser clients are expected to see. NestJS CSRF documentation
Set response security headers and test their effects
From NestJS 12.1, app.useSecurityHeaders() sets browser-facing headers with defaults aligned to Helmet 8, including CSP, HSTS, content-type sniffing protection, and frame options. Call it immediately after creating the application, before initialization or listening. NestJS security headers documentation
Content Security Policy can affect scripts, styles, images, and connections used by the application. Verify the policy against the resources the application actually needs and tailor it deliberately; do not disable it casually to make a broken page work. Existing Helmet integrations are also an option, but their setup differs between Express middleware and the Fastify plugin. NestJS security headers documentation
Use a deployment checklist before exposing the API
- Confirm authentication, authorization, and resource-level policy are enforced independently.
- Validate incoming data and choose request limits for sensitive routes; ensure the tracker works across deployed instances.
- Use HTTPS, store secrets in a secret manager, and use durable state storage when the application depends on sessions or other persistent authentication data. NestJS authentication documentation
- Set explicit CORS origins and methods, then test behavior with the production HTTP adapter. NestJS CORS documentation
- If using cookie authentication, review trusted origins, CSRF behavior, proxy Host handling, and which methods can change state. NestJS CSRF documentation
- Check the effects of security headers against the application’s real resource requirements, and keep OpenAPI security descriptions aligned with runtime enforcement. NestJS security headers documentation NestJS OpenAPI security documentation
NestJS supplies building blocks for a secure REST API, not a universal secure-by-default configuration. The reliable approach is to make each control explicit, align it with the chosen adapter and authentication model, and verify that deployment details preserve the intended policy.
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