readMembers and registerMember functions added.

apiFunctions.js

@@ -0,0 +1,13 @@
+const write = require('./jsonRW.js');
+
+module.exports = (app)=> {    
+      app.post('/api/v1/members/register', (req, res) => {
+          let body = req.body;
+          if (body.userName==undefined||body.email==undefined||body.password==undefined){
+              res.status(400).send("Invalid Post request")
+              return;
+          }
+          write.registerMember(body.userName,body.email,body.password);
+          res.status(200).send("User Registered.");
+      });
+  }

index.js

@@ -1,10 +1,16 @@
-/**
- * External libraries
- */
-const
-    express = require('express'),
-    http = require('http'),
-    app = express(),
-    bodyParser = require('body-parser'),
-    // When running the server can pass in the PORT as an argument (environment variable)
-    port = process.env.PORT || 3000;
+const express = require('express');
+const bodyParser = require('body-parser');
+
+const routes = require('./apiFunctions.js');
+const port = process.env.PORT || 3000; //env port for heroku and similar services.
+
+let app = express();
+
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({extended:false}));
+
+routes(app);
+
+app.listen(port, () => {
+    console.log(`Server is open on port ${port}`);
+});

jsonRW.js

@@ -0,0 +1,27 @@
+const fs = require('fs');
+
+let registerMember = (userName,email,password)=>{
+    let members = readMembers();
+    let memberDetails ={
+        id : (members.length)+1,
+        userName,
+        email,
+        password
+    }
+    members.push(memberDetails);
+    fs.writeFileSync('./config/members.json', JSON.stringify(members));
+}
+
+let readMembers = () => {
+    try {
+      let memberString = fs.readFileSync('./config/members.json');
+      return JSON.parse(memberString);
+    } catch (e) {
+      return [];
+    }
+};
+
+module.exports ={
+    registerMember,
+    readMembers
+}