This example add-on uses files from Stremio Static Add-on Example

npm install
npm start

Then use the URL that is printed as the Add-on Repository URL

index.js file contents:

const express = require('express')

const app = express()

const opts = {
  setHeaders: (res, path, stat) => {
    res.set('Access-Control-Allow-Origin', '*')
    res.set('Access-Control-Allow-Headers', '*')
  }
}
 
app.use('/', express.static('./', opts))

app.listen(7000)

console.log('Add-on started on: http://127.0.0.1:7000/manifest.json')

That's it, this add-on simply serves the files from Stremio Static Add-on Example through a local web server, it also sets CORS in the response headers.

localtunnel allows you to publish a local add-on to a remote address.

Usage:

npm install -g localtunnel
lt --port 7000

This will typically bring a response such as:

your url is: https://perfect-bird-96.localtunnel.me

In which case you should use https://perfect-bird-96.localtunnel.me/manifest.json as your Add-on Repository URL