Programming and Extending PocketBase with JSVM

PocketBase is not just a simple backend solution—it offers powerful capabilities for extending its functionality through JavaScript, specifically using the Goja engine and its JSVM (JavaScript Virtual Machine). This allows developers to add custom logic, plugins, and server-side rendering to their applications, making PocketBase a highly versatile platform.

A Growing Ecosystem

The PocketBase ecosystem is expanding rapidly, making it easier to enhance your applications in a modular and scalable way. A key project in this space is pocketpages.dev: a platform for building classic server-side rendered (SSR) pages with PocketBase. By leveraging PocketBase’s JSVM and the Goja engine, developers can serve SSR content, delivering a seamless experience for static or dynamic web pages directly from PocketBase.

Extending PocketBase with JSVM

PocketBase’s JSVM makes it possible to run custom JavaScript code directly within your PocketBase instance. This can be used for a wide range of tasks, from extending API functionality to adding business logic that runs server-side. With the JSVM feature, you can write JavaScript code that interacts with PocketBase’s core services, hooks, and events.

Use Cases for JSVM

• Custom API Routes: Use the JSVM to define and execute custom routes that go beyond the default PocketBase APIs. This enables more sophisticated data manipulation, custom validation, and complex business logic.

• Hooks and Triggers: Integrate JavaScript hooks into your application to trigger actions in response to database changes, such as sending notifications when records are updated or applying complex validation before data is written.

• Reusable Modules: Package custom logic as JavaScript modules in pb_hooks and share patterns across instances. The JSVM makes it straightforward to build reusable server-side code for PocketBase.

Hosting Static and SSR Content

PocketHost is an excellent choice for hosting both static/SSG (Static Site Generation) and SSR (Server-Side Rendered) content. With PocketPages.dev and similar technologies, you can combine the power of PocketBase’s JSVM and server-side rendering to deliver fully dynamic web applications.

• Static Content: PocketHost supports static files and SSG, making it ideal for static websites or single-page applications.
• Server-Side Rendering (SSR): By using PocketPages and PocketBase’s JavaScript capabilities, you can serve SSR pages directly from your backend. This provides the advantages of SEO and faster initial page loads for dynamic content.