A tiny express server for compiling Elm

index.js

// JSON API

const app = require("express")();
const bodyParser = require("body-parser");

app.use(bodyParser.json())


// COMPILE

const assert = require("assert");
const fs = require("fs");
const temp = require("temp");
const elm = require("node-elm-compiler");

const flags = { warn: true, yes: true, report: "json" };

app.post("/compile", function (request, response) {
  temp.open({ suffix: 'elm' }, (tempError, { fd, path }) => {
    assert(!tempError);
    fs.write(fd, request.body.elm, fsError => {
      assert(!fsError);
      elm.compileToString(path, flags).then(
        output => response.send({ output }),
        error => response.send({ error })
      );
    });
  });
});


// START SERVER

const port = process.env["PORT"] || 3000;

app.listen(port, function() {
  console.log(`Listening on port ${port}...`);
}); 

package.json

{
    "description": "A tiny express server for compiling Elm",
    "repository": "gist.github.com/hkgumbs",
    "license": "BSD3",
    "dependencies": {
        "body-parser": "^1.18.2",
        "express": "^4.16.3",
        "node-elm-compiler": "^4.5.0",
        "npm": "^5.8.0",
        "temp": "^0.8.3"
    }
}