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Mastra Server

When deploying your Mastra application to production, it runs as an HTTP server that exposes your agents, workflows, and other functionality as API endpoints. This page covers how to configure and customize the server for a production environment.

Server architecture​

Mastra uses Hono as its underlying HTTP server framework. When you build a Mastra application using mastra build, it generates a Hono-based HTTP server in the .mastra directory.

The server provides:

  • API endpoints for all registered agents
  • API endpoints for all registered workflows
  • Custom API route support
  • Custom middleware support
  • Configuration of timeout
  • Configuration of port
  • Configuration of body limit

See the Middleware and Custom API Routes pages for details on adding additional server behaviour.

Server configuration​

You can configure server port and timeout in the Mastra instance.

src/mastra/index.ts
import { Mastra } from "@mastra/core/mastra";

export const mastra = new Mastra({
  // ...
  server: {
    port: 3000, // Defaults to 4111
    timeout: 10000, // Defaults to 30000 (30s)
  },
});

The method option can be one of "GET", "POST", "PUT", "DELETE" or "ALL". Using "ALL" will cause the handler to be invoked for any HTTP method that matches the path.

TypeScript configuration​

Mastra requires module and moduleResolution values that support modern Node.js versions. Older settings like CommonJS or node are incompatible with Mastra’s packages and will cause resolution errors.

tsconfig.json
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ES2022",
    "moduleResolution": "bundler",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true,
    "noEmit": true,
    "outDir": "dist"
  },
  "include": ["src/**/*"]
}

This TypeScript configuration is optimized for Mastra projects, using modern module resolution and strict type checking.

CORS configuration​

Mastra allows you to configure CORS (Cross-Origin Resource Sharing) settings for your server.

src/mastra/index.ts
import { Mastra } from "@mastra/core/mastra";

export const mastra = new Mastra({
  // ...
  server: {
    cors: {
      origin: ["https://example.com"], // Allow specific origins or '*' for all
      allowMethods: ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
      allowHeaders: ["Content-Type", "Authorization"],
      credentials: false,
    },
  },
});