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Building AI Agents with JavaScript/TypeScript

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The Shift: You Don't Need Python Anymore

For a long time, building serious AI applications meant learning Python. But in 2025, the landscape has completely shifted. The JavaScript and TypeScript ecosystem for AI agents has matured rapidly, offering tools that are arguably more production-ready and developer-friendly than their Python counterparts.

I am currently working on an AI agent framework project, which led me down a rabbit hole of researching the entire ecosystem. I wanted to understand the architecture, pain points, and solutions offered by every major tool out there.

Exploring the Ecosystem

My research went deep into the codebases of existing tools—I even ended up making minor open-source contributions to VoltAgent (a developer-focused agent framework) along the way.

In my full guide, I break down the best tools available right now across the spectrum:

  • Code-First Frameworks: For developers who crave full control and type safety. I cover LangChain.js (the mature giant), Mastra (batteries-included), VoltAgent (visual debugging), and the Vercel AI SDK.
  • Visual & Low-Code Platforms: For rapid prototyping and enterprise integrations. I analyze n8n, Flowise, and Langflow.
  • Specialized Tools: Niche frameworks like Coinbase AgentKit for Web3/Crypto interactions.

Making the Right Choice

The hardest part isn't finding a tool—it's picking the right one for your specific architecture.

Do you need a stateful graph for complex decision-making? LangGraph is your best bet. Need to integrate with 1,000+ business apps? n8n is the clear winner. Building a Next.js app? The Vercel AI SDK is a no-brainer.

Read the Complete Guide

I compiled all my notes, architectural comparisons, and "rabbit hole" discoveries into a comprehensive guide. Whether you are a seasoned TypeScript engineer or just getting started with AI, this article will help you navigate the ecosystem and start building agents today.

Read my full guide on Medium: Building AI Agents with JavaScript/TypeScript: Your Complete Guide