Why can't I display LaTeX formula and get a 404 error when deploying MathJax.js locally?

Problems and solutions for deploying MathJax.js locally to display LaTeX formulas

In web development, MathJax.js is a powerful tool for rendering LaTeX formulas. Referring to MathJax.js using CDN usually smoothly displays formulas, but you may encounter a 404 error when deploying locally, causing the formula to fail to display.

The problem stems from: MathJax.js itself depends on other files (such as extension files), and downloading only MathJax.js files does not guarantee that these dependencies will also be included. For example, MathJax.js may contain code like import xxx from './extension/MathZoom.js' . If extension/MathZoom.js is not downloaded locally, a 404 error will appear.

The following code snippet demonstrates the difference between using a CDN and local deployment:

CDN reference (normal display formula):

<script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js"></script>
<p>Example formula: \( \forall x \in \mathbb{R}, x^2 \ge 0 \)</p>

Local deployment (404 errors may occur):

<script src="./mathjax/tex-chtml.js"></script> <!-- Assume that the mathjax directory contains the required files-->
<p>Example formula: \( \forall x \in \mathbb{R}, x^2 \ge 0 \)</p>

Solution:

It is very cumbersome to download all MathJax.js dependencies directly to the local area and is not recommended. A better way is:

1. Install MathJax using npm or yarn: This ensures that all dependencies are installed correctly. Use the package manager to manage and update MathJax more easily. For example, use npm: npm install mathjax@3

2. Refer to the official MathJax documentation: The official documentation provides detailed local deployment guides, including how to configure and use MathJax. Following official guidelines can avoid errors caused by omitting dependency files.

3. Use the right MathJax version and configuration: Choosing the right MathJax version and configuration can reduce the number of dependent files and simplify the local deployment process.

Through the above methods, the 404 errors that occur when deploying MathJax.js locally can be effectively solved, and ensure that the LaTeX formula is displayed correctly in the local web page. Avoid downloading and manually managing large amounts of files directly and using package managers and referring to official documentation is a more reliable and efficient solution.

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