I was tried to implement webhook of quickbooks in nodejs api for get realtime data related to customer for update and insert in my sql database but not got any proper reference and found solutions.
Quickbooks webhooks can be easily implemented in node.js, here is git repo with sample code.
https://github.com/IntuitDeveloper/SampleApp-WebhookNotifications-nodejs
If you are new to quickbooks integration and would like to test if webhooks are received or not then you shall use https://requestbin.com/ to create online webhook receiver. Which will consume any payload sent to it. Thus you will know what kind of response body to expect when coding in node.js
Here is official step by step guide for webhook implementation
https://developer.intuit.com/app/developer/qbo/docs/develop/webhooks
Do share specific error if any