Create JSON from template

config-template.json

{
  "name": "Test",
  "baseURL": "__baseURL__",
  "otherBaseURL": "__baseURL__"
}

index.js

const fs = require("fs")

async function create(baseURL) {
  const tmpl = await fs.promises.readFile("./config-template.json", "utf-8")
  const contents = tmpl.replace(/__baseURL__/g, baseURL)
  await fs.promises.writeFile("./config.json", contents)
}

create("http://localhost:5000")