mcp-context7

Query up-to-date documentation and code examples for any programming library or framework via the Context7 MCP server. Best for API references, code examples, and usage patterns. No authentication required. Two-step process: resolve the library ID, then query docs.

Context7 vs DeepWiki: Use Context7 for API docs, code examples, and "how do I use X?" questions. Use DeepWiki for architecture, internals, and "how does X work under the hood?" questions.

Step 1: Resolve Library ID

Find the Context7 library ID for the library you need:

mcporter call 'context7.resolve-library-id(query: "how to use React hooks", libraryName: "react")' --output json

Returns matching libraries ranked by relevance. Pick the libraryId from the best match (format: /org/project).

Skip this step if you already know the library ID from the list below.

Common Library IDs

Library	ID	Library	ID
React	/facebook/react	Next.js	/vercel/next.js
TypeScript	/microsoft/TypeScript	Tailwind CSS	/tailwindlabs/tailwindcss
Node.js	/nodejs/node	Express	/expressjs/express
Vue	/vuejs/vue	Svelte	/sveltejs/svelte
Angular	/angular/angular	Remix	/remix-run/remix
Python (pandas)	/pandas-dev/pandas	scikit-learn	/scikit-learn/scikit-learn
Flask	/pallets/flask	Django	/django/django
FastAPI	/tiangolo/fastapi	SQLAlchemy	/sqlalchemy/sqlalchemy
LangChain	/langchain-ai/langchain	Anthropic SDK	/anthropics/anthropic-sdk-python
Rust	/rust-lang/rust	Go	/golang/go
PostgreSQL	/postgres/postgres	Redis	/redis/redis
Docker	/docker/docs	Kubernetes	/kubernetes/kubernetes

Step 2: Query Documentation

mcporter call 'context7.query-docs(libraryId: "/vercel/next.js", query: "how to set up middleware for authentication")' --output json

Response includes: libraryId, title, description, codeSnippetCount, and the documentation content.

Examples

# React hooks (known ID — skip resolve step)
mcporter call 'context7.query-docs(libraryId: "/facebook/react", query: "useEffect cleanup patterns")' --output json

# Next.js routing (known ID)
mcporter call 'context7.query-docs(libraryId: "/vercel/next.js", query: "app router dynamic routes with params")' --output json

# Python library (known ID)
mcporter call 'context7.query-docs(libraryId: "/pandas-dev/pandas", query: "merge dataframes on multiple columns")' --output json

# Unknown library — resolve first
mcporter call 'context7.resolve-library-id(query: "Prisma ORM", libraryName: "prisma")' --output json
mcporter call 'context7.query-docs(libraryId: "/prisma/prisma", query: "define relations between models")' --output json

- **Skip resolve** for libraries in the common IDs table above — go directly to `query-docs`. - Do not call either tool more than 3 times per question. Use the best result you have. - No authentication required — this server works out of the box. - **Write queries as questions**, not keywords. "How do I handle form validation in React?" works better than "React form validation". - Include use case context in your query for better results: "useEffect with async fetch and cleanup" > "useEffect". - If resolve returns no results, try a different `libraryName` or a more descriptive `query`. - Use `--output json` to parse results programmatically.