Mastra

Mastra is a TypeScript agent framework that gives JavaScript developers a complete, typed toolkit for building agents, workflows, memory and evaluations.

Overview

The Node ecosystem long lacked an agent framework as polished as Python’s offerings. Mastra fills that gap with agents, workflows, durable execution, retrieval and evaluation, all written in TypeScript with end-to-end types so refactors stay safe across your whole AI stack.

Mastra includes a local playground for testing agents, integrations for major model providers, RAG primitives for document pipelines, and a cloud platform for deploying agents with monitoring and tracing. Workflows support branching, suspension and resumption, which suits long-running business processes. Its workflow engine can pause long-running jobs and resume them later, which suits business processes that span days rather than seconds. Documentation and examples are oriented toward real product patterns rather than toy demos.

Key Features

• Fully typed agents, tools and workflows in TypeScript
• Visual local playground for testing and debugging agents
• Workflow engine with branching, suspend and resume semantics
• Built-in RAG primitives: chunking, embedding and retrieval
• Agent memory and conversation history management
• Evaluation tooling for scoring prompts and agent outputs
• Cloud deployment with tracing and observability

Pricing

Mastra’s framework is open source and free. Mastra Cloud offers a free tier for hobby projects and usage-based pricing for production deployments, with enterprise plans covering dedicated support, security review and custom limits. Cloud pricing scales with executions and model usage, and small teams can run the entire stack locally during development without spending anything.

Who Is It For

Mastra is for TypeScript and Node.js developers building AI features into web products, backends and automation. It is a natural fit for full-stack teams that want one language across the product and its AI layer. Startups building AI-native products in Node find they can share types and infrastructure across their whole application stack.

FAQ

Is Mastra free to use?

Yes, the framework is free and open source, and Mastra Cloud includes a free tier for small projects. Paid plans begin when you need higher execution volume and team features.

Does Mastra offer an API?

Yes, workflows and agents can be exposed as HTTP endpoints with typed contracts, and Mastra Cloud provides hosted endpoints with keys, rate limits and usage analytics.

How does Mastra compare to alternatives?

Mastra is the strongest typed option in a field dominated by Python. It gives up some bleeding-edge research tooling compared with Python frameworks, but for product teams shipping TypeScript services it removes an entire class of integration friction. For JavaScript teams, Mastra removes the need to reach for Python tooling, keeping the codebase unified while still delivering modern agent capabilities.