After Update to 0.20 from 0.19 the error Cannot assign to read only property 'defaults' of object '[object Object]' occurs
The release says that there a breaking change. Try that and see if the problem goes away. I got the same error but haven't tried the fix yet. https://github.com/artf/grapesjs/releases/tag/v0.20.1
Read full answer below βQuestion
GrapesJS version
- I confirm to use the latest version of GrapesJS
What browser are you using?
chrome
Reproducible demo link
none
Describe the bug
image.js :

Code of Conduct
- I agree to follow this project's Code of Conduct
Answers (3)
The release says that there a breaking change. Try that and see if the problem goes away. I got the same error but haven't tried the fix yet. https://github.com/artf/grapesjs/releases/tag/v0.20.1
Yes, as mentioned in the release note you have to switch from the old legacy API for custom component registration.
Thanks for reporting this, @Aventrue. The issue with After Update to 0.20 from 0.19 the error Cannot assign to read only property 'defaults' of object '[object Object]' occurs appears to be a race condition or state management timing problem. This typically happens when component lifecycle events a...
Related Questions and Answers
Continue research with similar issue discussions.
Issue #5378
Uncaught TypeError: Cannot read properties of undefined (reading 'Canvas') while dragging a component in Layer Manager Panel
GrapesJS version [X] I confirm to use the latest version of GrapesJS What browser are you using? Chrome v116.0.5845.97 Reproducible demo li...
Issue #5320
Upload Image or Asset is not triggering on File/Image selection
GrapesJS version [X] I confirm to use the latest version of GrapesJS What browser are you using? Chrome v114 Reproducible demo link none De...
Issue #5583
Can't set background:none in mobile version using styles panel
GrapesJS version [X] I confirm to use the latest version of GrapesJS What browser are you using? Edge last version Reproducible demo link h...
Issue #5385
getDirtyCount() non deterministic after load
GrapesJS version [X] I confirm to use the latest version of GrapesJS What browser are you using? Chrome Reproducible demo link https://gith...
Paid Plugins That Match This Issue
Curated by issue keywords and label relevance to help you ship faster.
Loading paid plugin recommendations...
Check the open-source GrapesJS plugins on GitHub or run a quick search in our free catalog.
Browse free plugins βPremium plugins ship with support, regular updates, and production-ready features β save days of integration work.
Browse premium plugins βRelated tutorials
In-depth guides on the same topic.
Tutorial
How to Build a Production GrapesJS Editor: The Complete Walkthrough of Brief, Preset, Plugins, and Services
A complete walkthrough of building a production GrapesJS editor: how to choose a preset, pick plugins, and scope setup services without burning a sprint.
Tutorial
GrapesJS Inline RTE Plugins Update: CKEditor 5 v0.1.4 and Froala Inline Text Editor
CKEditor 5 Inline for GrapesJS v0.1.4 fixes Studio SDK toolbar clipping, iframe injection and link balloon bugs. Compare with Froala Inline β both $69.
Tutorial
Embed GrapesJS in Your SaaS: A Weekend Guide
Embed GrapesJS in your SaaS and ship a white-label page builder over a weekend. Honest tradeoffs, real code, and the plugins that close the UX gap.
Browse Plugin Categories
Jump directly to plugin category pages on the marketplace.