This is a simplified version of whats needed to connect to InvokeAI websocket api, submit requests, upload init_images and recieve results

invokeAi-api-gist

const io = require("socket.io-client")
const socket = io("http://127.0.0.1:9090",{reconnect: true})
const log = console.log.bind(console)

socket.on("connect", (socket) => {
	log(socket) // Connected to api
})

socket.on("progressUpdate", (data) => {
	log(data) // Returns current steps, status etc
}

socket.on("generationResult", (data) => {
	log(data) // data contains all the image data needed (params, filename etc)
})

var imageOptions={
  prompt: 'anon goes to space',
  iterations: 1,
  steps: 50,
  cfg_scale: 7.5,
  threshold: 0,
  perlin: 0,
  sampler_name: 'k_lms',
  width: 512,
  height: 512,
  seed: 2977597109,
  progress_images: false,
  variation_amount: 0,
  strength: 0.75,
  fit: true
}
var upscale=false // or an object like {level:2,strength:0.5}
var facefix=false // or an object like {type:'codeformer',strength:1,codeformer_fidelity:1}}
socket.emit('generateImage',imageOptions,upscale,facefix) // Send request, result comes via a "generationResult" reply

// if you need to send an init image
// "initimg" should contain a buffered file // Buffer.from(res.data)
// socket.emit('uploadInitialImage', initimg, 'filename.png') // I pass an id via the filename to associate the returned result later

socket.on("initialImageUploaded", (data) => {
	log(data) // Contains uploaded images new filename
})