Top 5 TypeScript AI Agent Frameworks You Should Know in 2026

In GitHub's 2025 language report, TypeScript officially surpassed Python. The race was fierce, but TypeScript won. While Python still dominates the AI agent ecosystem, JavaScript and TypeScript are the fastest-growing alternatives—and for good reason. Full-stack developers can now build AI agents without switching stacks.

If you want the full picture across all languages, check out Top 10 Most Starred AI Agent Frameworks on GitHub (2026). This article focuses on the TypeScript ecosystem.

1. Vercel AI SDK ⭐ 20,400 | 📦 2.8M downloads/week

From the creators of Next.js, the Vercel AI SDK is the most downloaded TypeScript AI framework by a massive margin. It provides streaming-first primitives for building AI-powered user interfaces, with built-in support for React Server Components and edge runtimes.

Best for: React and Next.js developers who want to add AI features to their web applications with minimal friction.

GitHub: vercel/ai

2. Mastra ⭐ 19,024 | 📦 151K downloads/week

Mastra is a TypeScript-native AI agent framework built for production. It includes assistants, RAG pipelines, and built-in observability out of the box. Unlike ports from Python, Mastra was designed from the ground up for the TypeScript ecosystem.

Best for: Teams building production-grade agent systems who need full observability and don't want to piece together multiple libraries.

GitHub: mastra-ai/mastra

3. LangChain.js ⭐ 16,600 | 📦 795K downloads/week

The JavaScript port of the most popular Python AI framework. LangChain.js brings the same modular architecture—chains, agents, tools, and memory—to the JS ecosystem. If your team already uses LangChain in Python, the API will feel familiar.

Best for: Teams already invested in the LangChain ecosystem, or developers who want access to LangChain's extensive documentation and community.

GitHub: langchain-ai/langchainjs

4. VoltAgent ⭐ 4,478 | 📦 151K downloads/week

VoltAgent is an open-source AI agent framework with LLM observability built into its core. It's a rising star in the ecosystem, offering debugging and tracing capabilities that are often afterthoughts in other frameworks.

Best for: Developers who prioritize debugging, tracing, and understanding what their agents are actually doing under the hood.

GitHub: VoltAgent/voltagent

5. LangGraph.js ⭐ 2,388 | 📦 529K downloads/week

LangGraph.js brings graph-based orchestration to AI agents. Instead of linear chains, you define your agent logic as nodes and edges—making it easier to build complex, multi-step workflows with branching, loops, and conditional logic.

Best for: Complex agent workflows that need fine-grained control over execution flow, especially multi-agent systems.

GitHub: langchain-ai/langgraphjs

Special Mentions

These frameworks are brand new but backed by major players. Watch this space.

Google ADK TypeScript ⭐ 581 | 📦 5K downloads/week — Google's agent development toolkit, released December 2025. Code-first approach with flexibility and control.
OpenAI Agents SDK TypeScript ⭐ 2,100 | 📦 128K downloads/week — Official OpenAI framework for multi-agent workflows and voice agents. Lightweight but powerful.

Key Insights

Vercel AI SDK dominates downloads — 2.8M weekly vs. the next best at 795K. The Next.js ecosystem effect is real.
LangGraph.js punches above its weight — Only 2.3K stars but 529K weekly downloads. Developers are using it, even if they're not starring it.
Stars ≠ adoption — Mastra has more stars than LangChain.js but fewer downloads. Community buzz doesn't always match production usage.
The big players just arrived — Google ADK and OpenAI SDK are brand new. Momentum over the next 6 months will tell the real story.

What to Read Next

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Star counts and npm downloads as of January 2026. Numbers change—check the repos and npm for the latest.

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