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Workflow SDK Documentation

Patterns for Defining Tools Human-in-the-Loop Building Durable AI Agents Queueing User Messages Resumable Streams Sleep, Suspense, and Scheduling Streaming Updates from Tools API Reference Workflow Globals Changelog Resilient run start Cookbook Building a World Deploying Astro Express Fastify Hono Getting Started NestJS Next.js Nitro Nuxt Python SvelteKit Vite corrupted-event-log fetch-in-workflow hook-conflict Errors node-js-module-in-workflow serialization-failed start-invalid-workflow-function step-not-registered timeout-in-workflow webhook-invalid-respond-with-value webhook-response-not-sent workflow-not-registered Errors & Retrying Hooks & Webhooks Idempotency Foundations Serialization Starting Workflows Streaming Versioning Workflows and Steps How the Directives Work Encryption Event Sourcing Framework Integrations Understanding Directives Migration Guides Migrating from AWS Step Functions Migrating from Inngest Migrating from Temporal Observability Testing Server-Based Testing createHook createWebhook defineHook FatalError fetch getStepMetadata getWorkflowMetadata getWritable workflow RetryableError sleep @workflow/vitest DurableAgent @workflow/ai WorkflowChatTransport getHookByToken getRun getWorld workflow/api resumeHook resumeWebhook Chat Session Modeling runtime-decryption-failed Upgrading Workflows abort-signal-timeout-in-workflow Cancellation How Cancellation Works Internal Serializable AbortController and AbortSignal Eager Processing of Steps & Incremental Event Replay TanStack Start Agent Cancellation Sequential & Parallel Execution Workflow Composition Local World | Workflow SDK Postgres World | Workflow SDK Vercel World | Workflow SDK Migrating from trigger.dev Secure Credential Handling Postgres World | Workflow SDK Vercel World | Workflow SDK
Local World | Workflow SDK
2026-04-09 · via Workflow SDK Documentation

The Local World is bundled with workflow and used automatically during local development. No installation or configuration required.

To explicitly use the local world in any environment, set the environment variable:

WORKFLOW_TARGET_WORLD=local

The workflow CLI uses the local world by default. Running these commands inside your workflow project will show your local development workflows:

# List recent workflow runs
npx workflow inspect runs

# Launch the web UI
npx workflow web

Learn more in the Observability documentation.

E2E Tests

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Last updated: 4/17/2026, 6:41:14 PM · Commit: 5889d84

The local world works with zero configuration, but you can customize behavior through environment variables or programmatically via createLocalWorld().

WORKFLOW_LOCAL_DATA_DIR

Directory for storing workflow data as JSON files. Default: .workflow-data/

PORT

The application dev server port. Used to enqueue steps and workflows. Default: auto-detected

WORKFLOW_LOCAL_BASE_URL

Full base URL override for HTTPS or custom hostnames. Default: http://localhost:{port}

Port resolution priority: baseUrl > port > PORT > auto-detected

WORKFLOW_LOCAL_QUEUE_CONCURRENCY

Maximum number of concurrent queue workers. Default: 100

Programmatic configuration

import { createLocalWorld } from "@workflow/world-local";

const world = createLocalWorld({
  dataDir: "./custom-workflow-data",
  port: 5173,
  // baseUrl overrides port if set
  baseUrl: "https://local.example.com:3000",
});

The local world is designed for development, not production:

  • In-memory queue - Steps are queued in memory and do not persist across server restarts
  • Filesystem storage - Data is stored in local JSON files
  • Single instance - Cannot handle distributed deployments
  • No authentication - Suitable only for local development

For production deployments, use the Vercel World or Postgres World.