diff --git a/index.js b/index.js
index 8b13789..af4ee89 100644
--- a/index.js
+++ b/index.js
@@ -1 +1,181 @@
+let http = require('http');
+let state = require('./state');
+let users = state.users;
+let products = state.products;
 
+let server = http.createServer(messageReceived);
+server.listen(8080);
+
+function messageReceived(req, res) {
+    res.writeHead( 200, {'Content-Type': 'text/plain'} );
+
+    // get all users:
+    if( req.method === 'GET' && req.url === '/users' ) {
+        res.write( JSON.stringify(users) );
+        res.end()
+    }
+
+    // get all products:
+    else if( req.method === 'GET' && req.url === '/products' ) {
+        res.write( JSON.stringify(products) );
+        res.end();
+    }
+
+    // get specific user by id:
+    else if( req.method === 'GET' && req.url.indexOf('/users') > -1 ) {
+        let id = req.url.split('/');
+        let user = users.find( u => u['_id'] === Number(id[2]) );
+        if(!user) {
+            res.write('User Not Found');
+        }
+        else {
+            let userJSON = JSON.stringify(user);
+            res.write(userJSON);
+        }
+        res.end()
+    }
+
+    // get specific product by id:
+    else if( req.method === 'GET' && req.url.indexOf('/products/') > -1 ) {
+        let id = req.url.split('/');
+        let product = products.find( p => p['id'] === Number(id[2]) );
+        if(!product) res.write('Product not found')
+        else {
+            let productJSON = JSON.stringify(product);
+            res.write(productJSON);
+        }
+        res.end();
+    }
+
+    // post a new user:
+    else if( req.method === 'POST' && req.url === '/users' ) {
+        postUsers(req, res);
+    }
+
+    // post a new product:
+    else if( req.method === 'POST' && req.url === '/products' ) {
+        let body = [];
+        req.on( 'data', (chunk) => {
+            body.push(chunk);
+        }).on( 'end', () => {
+            body = Buffer.concat(body).toString();
+            // parse JSON to create an object(s) from the body:
+            let product = JSON.parse(body);
+            
+            // add _id property to new product:
+            product.id = products.length + 1;
+    
+            // push new product to products array in state.js:
+            products.push(product);
+            
+            // return the data we just updated to the client:
+            res.write(JSON.stringify(product));
+            res.end();
+        })
+    }
+
+    // change a user:
+    else if( req.method === 'PUT' && req.url.indexOf('/users/') > -1 ) {
+        // putUsers();
+        let body = [];
+        let id = req.url.split('/');
+        let user = users.find( u => u['_id'] === Number(id[2]) );
+    
+        req.on( 'data', (chunk) => {
+            body.push(chunk);
+        }).on( 'end', () => {
+            body = Buffer.concat(body).toString();
+            body = JSON.parse(body);
+            user.occupation = body.occupation;
+            res.write(JSON.stringify(user))
+            res.end();
+        })
+    }
+
+    // change a product:
+    else if( req.method === 'PUT' && req.url.indexOf('/products/') > -1 ) {
+        let body = [];
+        let id = req.url.split('/');
+        let product = products.find( u => u['id'] === Number(id[2]) );
+    
+        req.on( 'data', (chunk) => {
+            body.push(chunk);
+        }).on( 'end', () => {
+            body = Buffer.concat(body).toString();
+            body = JSON.parse(body);
+            product.description = body.description;
+            res.write(JSON.stringify(product))
+            res.end();
+        })
+    }
+
+    // delete a user:
+    else if( req.method === 'DELETE' && req.url.indexOf('/users/') > -1 ) {
+        let id = req.url.split('/');
+        let user = users.find( u => u['_id'] === Number(id[2]) );
+        if(!user) {
+            res.write('User Not Found');
+        }
+        else {
+            user.isActive = false;
+            res.write(`Deleted user ${user._id}: ${user.name}`);
+        }
+        res.end()
+    }
+
+    else if( req.method === 'DELETE' && req.url.indexOf('/products/') > -1 ) {
+        let id = req.url.split('/');
+        let product = products.find( p => p['id'] === Number(id[2]) );
+        if(!product) {
+            res.write('Product not found');
+        }
+        else {
+            product.isActive = false;
+            res.write(`Deleted product #${product.id}: ${product.name}`);
+        }
+        res.end();
+    }
+
+    else {
+        res.write('Not Found')
+    }
+
+    // res.end();
+}
+
+function postUsers(req, res) {
+    // initialize array to store the body:
+    let body = [];
+    req.on( 'data', (chunk) => {
+        body.push(chunk);
+    }).on( 'end', () => {
+        body = Buffer.concat(body).toString();
+        // parse JSON to create an object(s) from the body:
+        let user = JSON.parse(body);
+        
+        // add _id property to new user:
+        user._id = users.length + 1;
+
+        // push new user to users array in state.js:
+        users.push(user);
+        
+        // return the data we just updated to the client:
+        res.write(JSON.stringify(user));
+        res.end();
+    })
+}
+
+// function putUsers(req, res) {
+//     let body = [];
+//     let id = req.url.split('/');
+//     let user = users.find( u => u['_id'] === Number(id[2]) );
+
+//     req.on( 'data', (chunk) => {
+//         body.push(chunk);
+//     }).on( 'end', () => {
+//         body = Buffer.concat(body).toString();
+//         body = JSON.parse(body);
+//         user.occupation = body.occupation;
+//         res.end();
+//     })
+// }
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