react-express-mongodb: rename server to backend

The goal here is to keep the same structure than the other examples.
Also, considering that it has a "frontend" folder, the equivalent for
the server should be "backend".

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-express-mongodb/backend/config/config.js

@@ -0,0 +1,12 @@
+var env = process.env.NODE_ENV || 'development';
+
+if(env === 'development' || env === 'test'){
+
+    const config = require('./config.json')
+    let envConfig = config[env];
+    console.log(envConfig);
+
+    Object.keys(envConfig).forEach((key) => {
+        process.env[key] = envConfig[key]
+    })
+}

react-express-mongodb/backend/config/config.json

@@ -0,0 +1,10 @@
+{
+  "test":{
+    "PORT": 3000,
+    "MONGODB_URI": "mongodb://mongo:27017/TodoAppTest"
+  },
+  "development":{
+    "PORT": 3000,
+    "MONGODB_URI": "mongodb://mongo:27017/TodoApp"
+  }
+}

react-express-mongodb/backend/config/messages.js

@@ -0,0 +1,62 @@
+module.exports = {
+    AUTHENTICATION_FAILED: {
+        code: 400,
+        message: 'Authentication failed. Please login with valid credentials.',
+        success: false,
+    },
+    SUCCESSFUL_LOGIN: {
+        code: 200,
+        message: 'Successfully logged in',
+        success: true,
+    },
+    INTERNAL_SERVER_ERROR: {
+        code: 500,
+        message: 'Something unexpected happened',
+        success: false,
+    },
+    UNAUTHORIZED: {
+        code: 401,
+        message: 'You session is expired. Please login again',
+        success: false,
+    },
+    SUCCESSFUL_DELETE: {
+        code: 200,
+        message: 'Successfully deleted',
+        success: true,
+    },
+    SUCCESSFUL_UPDATE: {
+        code: 200,
+        message: 'Updated successfully',
+        success: true,
+    },
+    SUCCESSFUL: {
+        code: 200,
+        success: true,
+        message: 'Successfully completed',
+    },
+    NOT_FOUND: {
+        code: 404,
+        success: true,
+        message: 'Requested API not found',
+    },
+    ALREADY_EXIST: {
+        code: 200,
+        success: true,
+        message: 'Already exists',
+    },
+    FORBIDDEN: {
+        code: 403,
+        message: 'You are not authorized to complete this action',
+        success: false,
+    },
+    BAD_REQUEST: {
+        code: 400,
+        message: 'Bad request. Please try again with valid parameters',
+        success: false,
+    },
+    IN_COMPLETE_REQUEST: {
+        code: 422,
+        message: 'Required parameter missing',
+        success: false,
+    },
+};