LangGraph.js Has a Free API: Build Stateful AI Agents in TypeScript
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LangGraph.js is LangChain's framework for building stateful, multi-actor AI agent applications - and its API lets you create complex agent workflows with cycles, persistence, and human-in-the-loop patterns. Why LangGraph.js Matters Most AI agent frameworks are linear chains: input → LLM → output. Real-world agents need loops, branching, memory, and error recovery. LangGraph.js models agents as graphs with state machines.