Block render function not trigger

The block manager doesn't see the change if you do this block.attributes.render = .... You have to update the property explicitly in this way:

block.set({
 render: () => {
  return `<div>NEW HTML</div>`
 }
})

And be careful, the render function SHOULD return the HTML string or the DOM node, NOT a Promise. If you need to do something async, at first resolve it, THEN update the render with the returned content.

Thanks for reporting this, @mohd7469.

Thanks for sharing your report about block render function not trigger. To help the team investigate and prioritize this:

Please provide:

1. A minimal reproducible example (CodeSandbox/JSFiddle)
2. Your GrapesJS version number
3. Browser and OS information
4. Any error messages from the browser console
5. Steps to reproduce the issue

What helps most:

• Minimal code example (not your full project)
• Screen recording or screenshot showing the issue
• Expected vs actual behavior clearly stated
• GrapesJS configuration you're using

With these details, the maintainers can identify and prioritize a fix much faster. The GrapesJS team is very responsive to well-documented issues.