Express endpoint not getting called - node.js

Question

An endpoint works fine if added directly to my server.js file:
app.post('/test', function(req,res) {
res.status(200).send({"message" : "OK"});
});
but in an attempt to refactor the app I include a file called api.js from server.js like this:
var routesApi = require('./server/routes/api');
app.use('/v1', routesApi);
and it looks like this:
var express = require('express');
var router = express.Router();
module.exports = function() {
router.post('/test', function(req, res){
res.status(200).send({"message" : "OK"});
});
return router;
}
but if I try and hit this end point the req "stalls" as there is no response. What am I doing wrong?

Answer 1

Because of the way you exported your router, you need to invoke routesApi when adding it to the middleware stack via .use(). This is how that might look like
app.use('/v1', routesApi());
Though you can avoid this altogether by changing your api.js to look like this:
var express = require('express');
var router = express.Router();
router.post('/test', function(req, res){
res.status(200).send({"message" : "OK"});
});
module.exports = router;
and the code for the server can stay the same since now, you're exporting an instance of the Router module.

Answer 2

you have define global variable for app and may use like this:
api.js
exports.allRoutes=function() {
var version1="v1";
app.post('/'+version1+'/test', function(req, res){
res.status(200).send({"message" : "OK"});
});
}
app.js
global.app = express();
var all_routes = require('./server/routes/api');
all_routes.allRoutes();
var server = http.createServer(app);
server.listen(app.get('port'), function(req,res){
console.log('Express server listening on port ' + app.get('port'));
});