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node.jsexpress

Using nodemon I am facing error - ReferenceError: app is not defined

Getting ReferenceError: app is not defined.

Here is the error details- with source code

[nodemon] restarting due to changes... [nodemon] starting node server.js

D:\ebl\server\app\routes.js:4 app.get('/health', (_req, res) => { ^

ReferenceError: app is not defined at Object.<anonymous> (D:\ebl\server\app\routes.js:4:1) at Module._compile (node:internal/modules/cjs/loader:1241:14) at Module._extensions..js (node:internal/modules/cjs/loader:1295:10) at Module.load (node:internal/modules/cjs/loader:1091:32) at Module._load (node:internal/modules/cjs/loader:938:12) at Module.require (node:internal/modules/cjs/loader:1115:19) at require (node:internal/modules/helpers:130:18) at Object.<anonymous> (D:\ebl\server\app\app.js:8:9) at Module._compile (node:internal/modules/cjs/loader:1241:14) at Module._extensions..js (node:internal/modules/cjs/loader:1295:10)

Node.js v20.9.0 [nodemon] app crashed - waiting for file changes before starting...

app.js

//app.js
require('dotenv').config('../.env')
const express = require('express')
const app = express();

app.use(require('./middleware'));
app.use(require('./routes'));
app.use(require('./error'));

module.exports = app;

routes.js

 const router = require('express').Router();

 app.get('/health', (_req, res) => {
 res.status(200).json({ message: 'success' })
 });

 module.exports = router

package.json

{
  "name": "ebl",
  "version": "1.0.0",
  "description": "ebl",
  "main": "index.js",
  "scripts": {
    "dev": "nodemon server.js"
  },
  "keywords": [],
  "author": "ebl",
  "license": "ISC",
  "dependencies": {
    "cors": "^2.8.5",
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "mongoose": "^8.3.5",
    "morgan": "^1.10.0"
  },
  "devDependencies": {
    "nodemon": "^3.1.0"
  }
}

I chanage the path route '/health' to another name '/home', but error is the same

Solution

  • Getting ReferenceError: app is not defined.

    Just change the following in routes.js.

    router.get('/health', (_req, res) => {...