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

The Client-Side and Server-Rendered Virtual DOM Trees Mismatch: A Comprehensive Debugging Guide

When leveraging Nuxt.js or Vuejs, a persistent error commonly encountered is "The client-side rendered virtual DOM tree is not matching server-rendered content." This issue arises from incorrect HTML markup, such as erroneous element nesting or missing table body tags. To effectively debug this error, it's crucial to pinpoint the specific cause.

The Chrome DevTools provide a comprehensive method for isolating the culprit element. Navigate to Chrome's DevTools and locate the error message in the console. Click on the source location hyperlink to unveil the specific line in the vue.runtime.esm.js file.

Establish a breakpoint on that line and reload the page to trigger the error. Examine the call stack and navigate to the "patch" function within the hydrate function.

In the hydrate function, set a breakpoint 15 lines from the start, where false is returned if assertNodeMatch fails. Debug the error again and evaluate the elm and vnode variables in the console. Elm represents the server-rendered DOM element, while vnode is the corresponding virtual DOM node. By comparing their HTML, you can identify the source of the mismatch.

This systematic approach leverages the Chrome DevTools to pinpoint the root cause of the virtual DOM tree discrepancy, enabling you to rectify the HTML markup and eliminate the error.

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