lazy-load express routes

[its-dibo]

I have too many routes in my express app, all of them are loaded when the app started.

I want to load each route only when needed.
so, I tried this approach but with no luck.

let app = Router();

app.get('/collections', getRoute('collections'));
// other routes....

function getRoute(route: string): any {
  let [path, func = 'default'] = route.split(':');

  console.log(`getting route: ${path}`);
  return require(`./${path}`)[func];
}

collections.ts

export default (req,res)=>res.json({ok:1})

when the app starts it logs 'getting route: collections' once and in advance (even if it not accessed).

but I want to load this route only when we access the route 'api/collections'

[scinscinscin]

What you might want is

let app = Router();

app.get('/collections', getRoute('collections'));
// other routes....

function getRoute(route: string): any {
  let [path, func = 'default'] = route.split(':');
  let fn = null;
  
  return (req, res, next) => {
    if(fn == null) fn = require(`./${path}`)[func];
    return fn(req, res, next);
  };
}

[its-dibo]

I see the only difference here is that you cached the function in fn, but here fn will be loaded when Express starts up, not lazy loaded

[scinscinscin]

fn = require(./${path})[func]; will only execute once the first request to the route is sent.