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Workflow Builder is an open-source Next.js template for building workflow automation platforms
Today we're open-sourcing Workflow Builder, a complete visual automation platform powered by the Workflow Development Kit (WDK).
The project includes a visual editor, execution engine, and infrastructure, giving you what you need to build your own workflow automation tools and agents. Deploy it to Vercel and customize it for your use case.
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Link to headingWhat's included in Workflow Builder
Workflow Builder is a production-ready Next.js application with a fully interactive workflow editor, AI-assisted workflow generation, six prebuilt integration modules, and end-to-end observability.
Link to headingVisual workflow editor
The visual workflow editor lets you build, connect, and execute workflows using drag-and-drop steps. You get real-time validation, undo/redo, auto-save, and persistent state without writing code.
Prebuilt integrations include:
Resend (emails)
Linear (issues)
Slack (notifications)
PostgreSQL (database)
HTTP requests (API calls)
Vercel AI Gateway (AI models)
Link to headingAI-powered text-to-workflow generation
The AI-powered text-to-workflow feature converts natural language prompts into executable workflows. Type a description of your automation, and the system generates structured step definitions and connections.
Link to headingWebhook triggers
Webhook triggers connect your workflows to external apps and APIs. External events, services, or data sources can trigger workflow execution in real time.
Link to headingReferencing outputs from previous steps
Each workflow step can access and reference outputs from previous steps. This creates dynamic, data-driven processes and enables agentic workflows where later steps depend on earlier results.
Link to headingWorkflow code generation
Every visual workflow compiles into executable TypeScript via the Workflow Development Kit (WDK). The "use workflow" and "use step" directives transform your functions into a runtime execution graph that handles state management, error handling, and step coordination.
Link to headingUse cases for Workflow Builder
With Workflow Builder, you have the foundation to build your own workflow automation platform for internal tools or customer-facing products:
Agents: Execute multi-step, cross-system workflows powered by AI
Internal tools: Custom automation systems tailored to your organization’s processes and systems
Customer-facing workflow tools: Offer domain-specific workflow builders like Zapier or n8n
Integration platforms: Add drag-and-drop workflow capabilities to your product
Data pipelines: Design ETL or data processing pipelines with visual monitoring and execution tracking