JavaScript AI Frameworks

Full-featured JavaScript frameworks for building AI-powered applications with LLMs, agents, and retrieval pipelines.

Vercel AI SDK

Frameworks

The TypeScript toolkit for building AI apps. Streaming UI, tool calling, and multi-provider support.

vercel/ai

LangChain.js

Frameworks

Framework for building LLM-powered apps. Chains, agents, retrieval, and memory out of the box.

langchain-ai/langchainjs

LlamaIndex.TS

Frameworks

Data framework for LLM apps in TypeScript. Connect your data to large language models.

run-llama/LlamaIndexTS

Mastra

Frameworks

Open-source TypeScript framework for AI agents and workflows. Memory, observability, and integrations with React, Next.js, and Node.

mastra-ai/mastra

ModelFusion

Frameworks

Archived TypeScript library for multimodal AI apps. Retained as a historical reference; use AI SDK for new projects.

vercel/modelfusion

More JavaScript AI tools