Developer reference
API reference
Every identifier you reach for, organised by technology: hooks, components, classes, functions, CLI commands and config options, from AI tooling to databases, testing and data science. Each entry links to its official documentation.
- Technologies
- 59
- Identifiers
- 5,698
- Identifier types
- 14
Choose a technology
- AI & MLAI / machine-learning engineering112 identifiers
- AI Toolsmodern AI developer tools and the Vercel AI SDK113 identifiers
- AI AgentsAI agents, planning and tool use119 identifiers
- Next.js 16+Next.js App Router and full-stack patterns118 identifiers
- React 19+advanced React 19 patterns and performance101 identifiers
- TypeScriptadvanced TypeScript for large codebases110 identifiers
- JavaScriptmodern JavaScript (ES2024+)100 identifiers
- JS Puzzlestricky JavaScript puzzles and gotchas100 identifiers
- Node.jsNode.js, APIs and backend architecture108 identifiers
- Express.jsExpress.js APIs and middleware116 identifiers
- Pythonmodern Python for backend and scripting163 identifiers
- NumPyNumPy numerical computing with ndarrays113 identifiers
- PandasPandas DataFrames and data manipulation129 identifiers
- PolarsPolars fast multi-threaded DataFrames102 identifiers
- SciPySciPy scientific & numerical computing114 identifiers
- Scikit-Learnscikit-learn machine learning134 identifiers
- TensorFlowTensorFlow deep learning111 identifiers
- PyTorchPyTorch deep learning126 identifiers
- KerasKeras high-level deep learning API106 identifiers
- FastAPIFastAPI async API framework16 identifiers
- SeabornSeaborn statistical visualization12 identifiers
- PlotlyPlotly interactive charts108 identifiers
- RequestsRequests HTTP for humans12 identifiers
- HTTPXHTTPX async HTTP client12 identifiers
- ScrapyScrapy web crawling framework12 identifiers
- PydanticPydantic data validation107 identifiers
- GraphQLGraphQL API design and clients116 identifiers
- TanStackTanStack Query, Router and Table111 identifiers
- ZustandZustand state management108 identifiers
- Redux ToolkitRedux Toolkit state management105 identifiers
- ZodZod schema validation123 identifiers
- ConformConform form validation103 identifiers
- Auth.jsAuth.js (NextAuth) authentication124 identifiers
- ClerkClerk authentication and user management108 identifiers
- KindeKinde auth and access control103 identifiers
- Better AuthBetter Auth authentication103 identifiers
- Drizzle ORMDrizzle ORM and type-safe SQL102 identifiers
- PrismaPrisma ORM, schema and Client105 identifiers
- NeonNeon serverless Postgres109 identifiers
- RedisRedis caching and data structures141 identifiers
- UpstashUpstash serverless Redis, queues and vector106 identifiers
- InngestInngest background jobs and workflows102 identifiers
- ArcjetArcjet security: rate limit, bot, WAF104 identifiers
- JestJest unit testing104 identifiers
- VitestVitest testing for Vite projects103 identifiers
- React Testing LibraryReact Testing Library104 identifiers
- PlaywrightPlaywright end-to-end testing103 identifiers
- CypressCypress end-to-end testing101 identifiers
- T3 Stackthe T3 stack: Next.js, tRPC, Tailwind, Prisma103 identifiers
- AngularAngular framework and APIs16 identifiers
- System Designscalable system design105 identifiers
- AWS ServicesAWS cloud services and architecture107 identifiers
- DevOpsDevOps, CI/CD, Docker and Kubernetes105 identifiers
- Deep Agentsdeep research and autonomous coding agent harness with sandboxing, subagents, and discipline middleware59 identifiers
- LangChainframework for context-aware reasoning applications, pre-built agents, and LLM orchestration72 identifiers
- LangGraphcyclical orchestration framework for stateful, multi-actor agents with streaming and human-in-the-loop65 identifiers
- Integrationspartner packages connecting LangChain and LangGraph to leading LLMs, vector stores, and MCP tools53 identifiers
- LangSmithobservability, evaluation, tracing, and prompt engineering platform for production LLM applications48 identifiers
- Langflowlow-code visual builder for AI agents and workflows, served through a REST API, MCP and A2A servers, and the LFX runtime103 identifiers
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