Скачать или смотреть Resolving TypeError and Webhook Issues with Next.js and Sanity

Discover how to troubleshoot the "resolver is not a function" error when revalidating Next.js components with Sanity webhooks. Get practical coding solutions and tips!
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This video is based on the question https://stackoverflow.com/q/76918668/ asked by the user 'Kavindu Wijesekara' ( https://stackoverflow.com/u/16945137/ ) and on the answer https://stackoverflow.com/a/77465337/ provided by the user 'Ahmer Saud' ( https://stackoverflow.com/u/13112286/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving TypeError and Webhook Issues with Next.js and Sanity: A Step-by-Step Guide

Setting up webhooks to manage content updates in your Next.js applications can be a tricky process. A common issue developers face involves an error message such as "resolver is not a function" when attempting to revalidate pages after updates in Sanity CMS. If you're encountering this problem, you're not alone, and this guide will break down the solution.

Understanding the Problem

In this scenario, your application deployed on Vercel is configured to trigger a webhook from Sanity whenever there are changes to the content, such as adding or updating testimonials. However, you're facing a few distinct issues:

Initial Error: "resolver is not a function".

Unauthorized Responses: Your API consistently returns a "401 Unauthorized" error message stating "Invalid request".

Key Reasons Behind the Errors

Signature Validation: The most likely culprit behind the unauthorized response is the signature validation process.

Function Exporting: Missing proper exports for the functions handling the webhook could also result in the errors encountered.

Step-by-Step Solution

Step 1: Set Up the Webhook Properly

First, ensure that you have a correct setup for your webhook handler. Here’s a snippet based on Next.js 13 that employs the app router for routing and revalidation:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Check Your Imports and Environment Variables

Ensure Imports Are Correct: Make sure that the necessary imports such as parseBody and revalidateTag are correctly specified at the top of your file.

Environment Variables: Double-check that your Sanity webhook settings and your environment variables have the same validation secret. Mismatched secrets can lead to the "Invalid request" response.

Step 3: Debugging the Signature Validation

Log Requests: To identify if the signature is valid, log the incoming request and the signature being validated. This will help you track any discrepancies.

Re-validate the Webhook Setup: Confirm that the webhook URL configured in your Sanity project matches with the one you are using for handling in Next.js.

Step 4: Testing the Setup

After you make the changes:

Update or add a testimonial in Sanity.

Watch for console logs to verify if the webhook is being triggered correctly and if the revalidation is functioning as expected.

Conclusion

While facing errors in a development environment, especially when working with webhooks, can be frustrating, following a structured approach can help you troubleshoot effectively. This guide covered:

Understanding the "resolver is not a function" and "401 Unauthorized" errors.

Setting up the webhook handler correctly.

Ensuring proper environment variables and imports.

By isolating these issues, you can ensure your Next.js application stays synchronized with your Sanity content without unnecessary full rebuilds. If you encounter any further issues, feel free to share in the comments!