update env settings

.env.example

@@ -0,0 +1,3 @@
+APP_URL=http://localhost:3000
+MONGO_URL=mongodb://localhost:27017/nodeAPI
+PORT=3000

.gitignore

@@ -0,0 +1,4 @@
+node_modules/
+npm-debug.log
+yarn-error.log
+.env

src/server.js

@@ -3,13 +3,14 @@ const cors = require('cors');
 
 const mongoose = require('mongoose');
 const requireDir = require('require-dir'); 
+require('dotenv-safe').config({ allowEmptyValues: true });
 
 const app = express();
 app.use(express.json()); // Permitir request de dados em formato JSON
 app.use(cors()); // Permite acesso da API aos domínios externos
 
 // Iniciando o Database
-mongoose.connect('mongodb://localhost:27017/nodeAPI', { useNewUrlParser: true })
+mongoose.connect(process.env.MONGO_URL, { useNewUrlParser: true })
     .then(() => console.log('MongoDB connected'))
     .catch(error => console.log('Connection failed: ' + error));
 mongoose.set('useFindAndModify', false);
@@ -19,6 +20,4 @@ requireDir('./models');
 // Rotas
 app.use('/api', require('./routes'));
 
-app.listen(3000, () => {
-    console.log('server on')
-});
+app.listen(process.env.PORT || 3000, () => console.log('server on'));