Relative path in index.html after build

Solution 1:

// package.json
{
  "name": "your-project-name",
  "version": "0.1.0",
  "homepage": "./", # <--- Add this line ----
  ...
}

Run npm run build again.

This will change the path to ./, which is the relative path of your project.

I encountered a similar issue and resolved it by setting "homepage": "./" in package.json

I found this solution here https://github.com/facebook/create-react-app/issues/165

If you're using webpack, you can try setting publicPath to ./

You can read more about it here.