if you find out the vue project generated by vue-cli scaffolding, you will find this code in the build/dev-server.js file

// proxy api requests
Object.keys(proxyTable).forEach(function (context) {
  var options = proxyTable[context]
  if (typeof options === 'string') {
    options = { target: options }
  }
  app.use(proxyMiddleware(options.filter || context, options))
})

Yes, the proxyTable you're talking about is an express middleware, but this express middleware is different from nuxt's middleware. It seems that the authorities have not explained exactly how to add it. Nuxt seems to use express when it is developed locally.

after some efforts, I finally got you out of this thing. How to add express middleware in nuxt?

first, install dependencies

  https://github.com/nuxt-commu.