Topic

OAuth2 & Bearer Token Auth for LLM Platforms

12 posts on oauth2 & bearer token auth for llm platforms — part of api integration on the n4n AI blog.

When to use OAuth2 instead of static API keys

A practical guide on when to use OAuth2 instead of API keys for LLM integrations, covering delegation, rotation, and multi-tenant tradeoffs.

July 17, 20266 min read

API integrationGuide

Securing multi-tenant LLM APIs with OAuth2

A practical guide to securing multi-tenant LLM APIs with OAuth2: tenant isolation, token design, scopes, introspection, and common pitfalls.

July 17, 20264 min read

API integrationComparison

Refresh tokens vs long-lived API keys for LLM platforms

A practical engineering comparison of refresh tokens vs long-lived API keys for LLM platforms across auth, cost, latency, and ergonomics.

July 17, 20265 min read

API integrationHow-to

OAuth2 scopes for fine-grained LLM API access control

Learn how to implement OAuth2 scopes for fine-grained LLM API access control with step-by-step token issuance, gateway enforcement, and verification.

July 17, 20263 min read

API integrationHow-to

OAuth2 client credentials flow for server-to-server calls

Implement the OAuth2 client credentials flow for server-to-server calls to LLM APIs with runnable Python code, token caching, and end-to-end verification.

July 17, 20263 min read

API integrationTutorial

Implementing OAuth2 login for a customer-facing LLM app

Step-by-step tutorial for implementing OAuth2 login in a customer-facing LLM app with Python, Authlib, and an OpenAI-compatible model gateway.

July 17, 20263 min read

API integrationHow-to

Debugging OAuth2 token expiry in production LLM apps

Hands-on step-by-step guide for debugging oauth2 token expiry production in LLM apps: reproduce expiry, inspect JWTs, fix refresh races, and verify.

July 17, 20263 min read

API integrationTutorial

Building an OAuth2 authorization server for LLM apps

Step-by-step tutorial for building OAuth2 authorization server for LLM apps with FastAPI and Authlib, issuing scoped JWTs for model access.

July 17, 20263 min read

API integrationComparison

Bearer token vs session cookie auth for API platforms

Compare bearer token vs session cookie auth for API platforms across capabilities, cost, latency, ergonomics, ecosystem, and limits, with a clear verdict.

July 17, 20265 min read

API integrationComparison

OAuth2 vs API keys for LLM platform authentication

A practical engineer's comparison of oauth2 vs api keys llm platform auth across capabilities, cost, latency, ergonomics, and limits for inference gateways.

July 16, 20264 min read

API integrationDefinition

How OAuth2 authorization code flow works for LLM APIs

Defines the OAuth2 authorization code flow for LLM APIs: how delegated token issuance works, why it beats API keys, and a minimal Python example with PKCE.

July 16, 20265 min read

API integrationDefinition

Bearer tokens explained: authenticating LLM API requests

Bearer tokens explained LLM API auth: definition of the scheme, token flow over HTTP, a real request example, and common mistakes to avoid.

July 16, 20265 min read