App Versioning Structure

app.js

import v1 from "./v1"
import v2 from "./v2"

import express from "express";

var app = express();

app.use("/v1", v1);
app.use("/v2", v2);

fooController.js

export default {
  getFoo: function (req, res) {},
  
  //This controller method had a breaking change, needed a second version
  getFooV2: function (req, res) {},
  
  saveFoo: function (req, res) {}
}

v1.js

import fooController from "./fooController";

import express from "express";

var appV1 = express();

appV1.get("/foo", fooController.getFoo);
appV1.put("/foo", fooController.saveFoo);

export default appV1;

v2.js

import fooController from "./fooController";

import express from "express";

var appV2 = express();

appV2.get("/foo", fooController.getFooV2); //This changed, so use the new version
appV2.put("/foo", fooController.saveFoo); //This didn't change, use the old version

epxort default appV2;