Hook0 is an open-source webhook server designed to help SaaS providers easily expose webhooks to their users without building the infrastructure from scratch. It solves common pain points like managing event subscriptions, handling failed delivery retries, and tracking event history for debugging. Built in Rust, Hook0 supports both cloud deployment and on-premises installation, making it ideal for developers who need a reliable, self-hostable webhook solution with a non-technical-friendly UI. The project is licensed under SSPL v1, allowing free use and modification while restricting managed service offerings.
Hook0 is tailored for developers building SaaS platforms who need to offer webhooks as a feature—whether to integrate with third-party tools, enable real-time notifications, or support automation workflows. Its combination of a REST API, event persistence, and an intuitive dashboard makes it suitable for teams that want to avoid reinventing webhook infrastructure while maintaining control over their data and deployment environment.
What You Get
- JSON REST API - Hook0 provides a documented, standards-compliant REST API for programmatically managing webhooks, subscriptions, and events. All operations are accessible via HTTP endpoints as described in the official API reference.
- Fine-grained subscriptions - Users can subscribe to specific event types (e.g., ‘user.created’, ‘payment.completed’) rather than receiving all events, enabling efficient and relevant event delivery.
- Auto request retry - Hook0 automatically retries failed webhook deliveries with exponential backoff, reducing manual intervention for transient failures.
- Events & responses persistence - Every event sent and every webhook response (including status codes and payloads) is stored, enabling audit trails and debugging for failed deliveries.
- Event scoping - Events can be scoped to specific projects or applications, allowing multi-tenant SaaS platforms to isolate webhook traffic between customers.
- On-Prem or Cloud deployment - Hook0 can be deployed on-premises using Docker or directly on Linux/macOS/Windows, or used via the free cloud tier at hook0.com.
- Modern dashboard - A no-code UI allows non-technical users to view event history, manage subscriptions, and monitor webhook delivery status without CLI or API knowledge.
Common Use Cases
- Building a multi-tenant SaaS dashboard - A SaaS company uses Hook0 to let customers subscribe to real-time events like invoice generation or user activity, with per-customer event scoping and detailed delivery logs for support.
- Creating a mobile-first e-commerce platform with 10k+ SKUs - Hook0 is used to notify external inventory systems and analytics tools whenever stock levels change, with automatic retries ensuring no updates are lost during API outages.
- Problem: Manual webhook management → Solution: Hook0 - A developer previously wrote custom code to handle retries and logging for webhooks. By switching to Hook0, they eliminated 80% of the webhook-related codebase and gained a visual dashboard for monitoring delivery failures.
- DevOps teams managing microservices across multiple cloud providers - Teams use Hook0 to centralize webhook delivery from internal services (e.g., CI/CD pipelines, monitoring tools) and route them to external systems like Slack, PagerDuty, or custom endpoints with guaranteed delivery tracking.
Under The Hood
Hook0 is a distributed, event-driven infrastructure system designed for robust webhook handling and organization management. It integrates multiple technologies to support scalable API services, real-time analytics, and flexible client integrations.
Architecture
The system adopts a modular monolithic architecture with well-defined separation of concerns across its components. It balances backend and frontend development through distinct modules that handle API, worker, and client logic.
- Modular design with clear responsibilities for REST API, output worker, and client SDKs
- Multi-language support enabling integration of Rust, Vue, and TypeScript
- Extensible architecture that supports dynamic subscription management and soft-deleting of resources
Tech Stack
Hook0 leverages a multi-language tech stack to build a resilient and scalable system, combining backend performance with modern frontend capabilities.
- Built primarily in Rust for core services and Actix-web for REST API handling
- Frontend developed using Vue.js with TypeScript for type safety and UI consistency
- PostgreSQL as the primary database with materialized views and optimized migrations
- Containerization and CI/CD pipelines for deployment and automated testing
Code Quality
The codebase demonstrates a balanced approach to quality with strong testing practices and structured error handling, though some inconsistencies remain.
- Comprehensive testing across Rust, frontend, and integration layers with Clippy, Rustfmt, and Playwright
- Consistent use of try/catch blocks and exception handling for robustness
- Extensive linting and CI/CD configurations to enforce code standards
- Moderate consistency in naming and style, with some technical debt in migration scripts
What Makes It Unique
Hook0 stands out through its innovative use of database optimizations and extensible architecture tailored for event-driven systems.
- Materialized views and database migrations optimized for high-performance event processing
- Built-in quota management and worker queue types enabling fine-grained control over capacity
- Developer-friendly ADRs and documentation practices that improve maintainability and onboarding
- Soft-deleting of resources and dynamic subscription management for flexible event handling