[CONVEX H(POST /polar/webhook)] Uncaught (FiberFailure) ReferenceError: Buffer is not defined

[dawn crater]

This error happens when i try to validate event using polar sdk

[rancid merlin]

Hi @dawn crater. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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The error ReferenceError: Buffer is not defined occurs because the Convex runtime does not provide the Node.js Buffer global by default. This is a common issue when using libraries (like the Polar SDK) that expect a Node.js environment, but are running in the Convex default runtime, which is more web-like and does not include Node.js globals such as Buffer.

How to fix:

1. Use the "use node" directive:
   If the code that validates the event (using the Polar SDK) requires Node.js features like Buffer, you need to ensure that the file or function is running in the Node.js runtime by adding "use node"; at the very top of the file (before any imports or comments). This tells Convex to run the function in a Node.js environment, where Buffer is available.

2. Check the SDK version:
   The Polar component has had issues with large bundle sizes and Node.js dependencies, but recent versions (0.6.0 and above) have improved compatibility and reduced size. Make sure you are using the latest version of @convex-dev/polar as this may resolve some compatibility issues automatically.
   Polar component usage and updates

3. If you are using a webhook handler:
   Make sure your webhook handler is in a file that uses the Node.js runtime if it needs Node.js features. For example:

   "use node";
   import { httpRouter } from "convex/server";
   import { polar } from "./example";
   
   const http = httpRouter();
   polar.registerRoutes(http as any);
   export default http;
   

   Place "use node"; at the very top of your convex/http.ts file if the Polar SDK or your code needs Node.js globals.

Summary:
Add "use node"; at the top of your webhook handler file to ensure Buffer is defined. If you still encounter issues, make sure you are using the latest version of the Polar component, as recent updates have improved compatibility with Convex's runtime.
See related discussion and solution
Polar component usage

If you continue to have issues after these steps, please provide the relevant code snippet and confirm your Polar SDK version.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: