How to Debug 'The client-side rendered virtual DOM tree is not matching server-rendered content' in Vue.js?

Debugging Virtual DOM Tree Mismatch in Vue.js

The error "The client-side rendered virtual DOM tree is not matching server-rendered content" indicates a discrepancy between the HTML markup generated on the server and the virtual DOM tree created on the client.

To debug this issue, consider using Chrome DevTools to localize the problem:

1. Open DevTools in Chrome (F12).
2. Load the page triggering the warning.
3. Scroll to the warning in the console.
4. Click the source location hyperlink of the warning.
5. Set a breakpoint at the specified line in the source code.
6. Refresh the page or revisit the section causing the error.
7. Inspect the call stack after breakpoint execution. Click one frame down to "patch" and open its source.
8. Hover over the hydrate function call and follow the hyperlink to its source.
9. Set a breakpoint in the hydrate function where false is returned.
10. Refresh the page and evaluate elm and vnode in the DevTools console.

elm represents the server-rendered DOM element, while vnode is the virtual DOM node. Inspecting their HTML content should reveal the location of the mismatch.

Additional Tips

• Using a lint tool such as ESLint with Vue.js rules can help prevent common markup errors.
• Manually verifying the HTML markup for nesting and missing elements can be helpful, especially in smaller applications.
• Consider using Vue.js development tools such as Vue.js devtools to inspect the virtual DOM tree on both the server and client.

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