Have you heard about react-content-loader? It's React component that uses SVG to create loaders which simulates the structure of the content that will be loaded. So now you can use this online tool to create your own loader easily. You just need to draw using the canvas or code using the live editing!
Read the documentation of react-content-loader.
This project was bootstrapped with Create React App, so in the project directory, you can run:
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.