diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..045afad
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,7 @@
+{
+  "extends": "es2015",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  }
+}
diff --git a/hw1/.eslintrc b/hw1/.eslintrc
index 162fc5c..045afad 100644
--- a/hw1/.eslintrc
+++ b/hw1/.eslintrc
@@ -1,3 +1,7 @@
 {
-  "extends": "es2015"
+  "extends": "es2015",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  }
 }
diff --git a/hw3/.eslintrc b/hw3/.eslintrc
new file mode 100644
index 0000000..162fc5c
--- /dev/null
+++ b/hw3/.eslintrc
@@ -0,0 +1,3 @@
+{
+  "extends": "es2015"
+}
diff --git a/hw3/README.MD b/hw3/README.MD
new file mode 100644
index 0000000..0de64dc
--- /dev/null
+++ b/hw3/README.MD
@@ -0,0 +1,44 @@
+# Usage examples
+
+### 1. Reverse string from process.stdin to process.stdout
+`npm start -- -a reverse`
+
+`npm start -- --action=reverse`
+
+
+
+### 2. Convert string to uppercase from process.stdin to process.stdout
+
+`npm start -- -a transform`
+
+`npm start -- --action=transform`
+
+
+
+### 3. Read file and print to console
+
+`npm start -- -a outputFile -f users.txt`
+
+`npm start -- --action=outputFile --file=users.txt`
+
+
+
+### 4. Read .csv file, convert to JSON and print to console
+
+`npm start -- -a convertFromFile -f users.csv`
+
+`npm start -- --action=convertFromFile --file=users.csv`
+
+
+### 5. Read .csv file, convert to JSON and write to .json file with the same name
+
+`npm start -- -a convertToFile -f users.csv`
+
+`npm start -- --action=convertToFile --file=users.csv`
+
+
+### 6. Bundle all css files from given folder and add extra css styles for own file
+
+`npm start -- -a cssBundler -p ./assets/css`
+
+`npm start -- --action=cssBundler --path=./assets/css`
diff --git a/hw3/package-lock.json b/hw3/package-lock.json
new file mode 100644
index 0000000..f8307bc
--- /dev/null
+++ b/hw3/package-lock.json
@@ -0,0 +1,84 @@
+{
+  "name": "hw3",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "commander": {
+      "version": "2.15.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
+      "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag=="
+    },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+    },
+    "csvjson": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/csvjson/-/csvjson-5.0.0.tgz",
+      "integrity": "sha1-RW3zzrqYnR+qEhG/KttKk8kel9Q="
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+    },
+    "isarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+    },
+    "process-nextick-args": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
+      "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw=="
+    },
+    "readable-stream": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+      "requires": {
+        "core-util-is": "1.0.2",
+        "inherits": "2.0.3",
+        "isarray": "1.0.0",
+        "process-nextick-args": "2.0.0",
+        "safe-buffer": "5.1.2",
+        "string_decoder": "1.1.1",
+        "util-deprecate": "1.0.2"
+      }
+    },
+    "safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+    },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "through2": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
+      "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
+      "requires": {
+        "readable-stream": "2.3.6",
+        "xtend": "4.0.1"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    }
+  }
+}
diff --git a/hw3/package.json b/hw3/package.json
new file mode 100644
index 0000000..6cab68f
--- /dev/null
+++ b/hw3/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "hw3",
+  "version": "1.0.0",
+  "description": "",
+  "main": "utils/streams.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node utils/streams.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/okachynskyy/nodejs-homeworks.git"
+  },
+  "keywords": [
+    "nodejs"
+  ],
+  "author": "Oleksiy Kachynskyy <oleksiy.kachynskyy@gmail.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/okachynskyy/nodejs-homeworks/issues"
+  },
+  "homepage": "https://github.com/okachynskyy/nodejs-homeworks#readme",
+  "dependencies": {
+    "commander": "^2.15.1",
+    "csvjson": "^5.0.0",
+    "through2": "^2.0.3"
+  }
+}
diff --git a/hw3/utils/assets/css/1.css b/hw3/utils/assets/css/1.css
new file mode 100644
index 0000000..60f1eab
--- /dev/null
+++ b/hw3/utils/assets/css/1.css
@@ -0,0 +1,3 @@
+body {
+  color: red;
+}
diff --git a/hw3/utils/assets/css/2.css b/hw3/utils/assets/css/2.css
new file mode 100644
index 0000000..d6b2916
--- /dev/null
+++ b/hw3/utils/assets/css/2.css
@@ -0,0 +1,3 @@
+.header {
+  background-color: gray;
+}
diff --git a/hw3/utils/lib/convert-from-file.js b/hw3/utils/lib/convert-from-file.js
new file mode 100644
index 0000000..c83ad67
--- /dev/null
+++ b/hw3/utils/lib/convert-from-file.js
@@ -0,0 +1,15 @@
+const fs = require('fs');
+const through = require('through2');
+const csvJson = require('csvjson');
+
+module.exports = (filePath, stdOut) => {
+  const parseCsv = function (buffer, encoding, next) {
+    const parsedCsv = csvJson.toObject(buffer.toString());
+    this.push(JSON.stringify(parsedCsv));
+    next();
+  }
+
+  fs.createReadStream(filePath)
+    .pipe(through(parseCsv))
+    .pipe(stdOut);
+}
diff --git a/hw3/utils/lib/convert-to-file.js b/hw3/utils/lib/convert-to-file.js
new file mode 100644
index 0000000..65c8e08
--- /dev/null
+++ b/hw3/utils/lib/convert-to-file.js
@@ -0,0 +1,20 @@
+const fs = require('fs');
+const path = require('path');
+const through = require('through2');
+const csvJson = require('csvjson');
+const pUtils = require('./path-utils');
+
+module.exports = (filePath) => {
+  const parseCsv = function (buffer, encoding, next) {
+    const parsedCsv = csvJson.toObject(buffer.toString());
+    this.push(JSON.stringify(parsedCsv));
+    next();
+  }
+
+  const outputFilePath = pUtils.replaceExt(filePath, '.json');
+  fs.createReadStream(filePath)
+    .pipe(through(parseCsv))
+    .pipe(fs.createWriteStream(outputFilePath));
+
+  console.info(`Done! Data saved to: \n${outputFilePath}`);
+}
diff --git a/hw3/utils/lib/css-bundler.js b/hw3/utils/lib/css-bundler.js
new file mode 100644
index 0000000..f10fdb2
--- /dev/null
+++ b/hw3/utils/lib/css-bundler.js
@@ -0,0 +1,18 @@
+const fs = require('fs');
+const path = require('path');
+
+module.exports = (folderPath) => {
+  const files = fs.readdirSync(folderPath);
+  const outputFilePath = path.resolve(folderPath, `bundle.css`);
+  const outStream = fs.createWriteStream(outputFilePath);
+
+  files.forEach(file => {
+    const filePath = path.resolve(folderPath, file);
+    fs.createReadStream(filePath).pipe(outStream);
+  });
+
+  const extraContent = path.resolve(__dirname, './css-data/nodejs18-hw3-css.css');
+  fs.createReadStream(extraContent).pipe(outStream);
+
+  console.info(`Done! Styles saved to: \n${outputFilePath}`);
+}
diff --git a/hw3/utils/lib/css-data/nodejs18-hw3-css.css b/hw3/utils/lib/css-data/nodejs18-hw3-css.css
new file mode 100644
index 0000000..25fdde8
--- /dev/null
+++ b/hw3/utils/lib/css-data/nodejs18-hw3-css.css
@@ -0,0 +1,15 @@
+.ngmp18 {
+  background-color: #fff;
+  overflow: hidden;
+  width: 100%;
+  height: 100%;
+  position: relative;
+}
+
+.ngmp18__hw3 {
+  color: #333;
+}
+
+.ngmp18__hw3--t7 {
+  font-weight: bold;
+}
diff --git a/hw3/utils/lib/output-file.js b/hw3/utils/lib/output-file.js
new file mode 100644
index 0000000..0e5ddfd
--- /dev/null
+++ b/hw3/utils/lib/output-file.js
@@ -0,0 +1,6 @@
+const fs = require('fs');
+const path = require('path');
+
+module.exports = (filePath, stdOut) => {
+  fs.createReadStream(filePath).pipe(stdOut);
+}
diff --git a/hw3/utils/lib/path-utils.js b/hw3/utils/lib/path-utils.js
new file mode 100644
index 0000000..8a7c3d6
--- /dev/null
+++ b/hw3/utils/lib/path-utils.js
@@ -0,0 +1,47 @@
+const fs = require('fs');
+const path = require('path');
+
+const resolveFilePath = (dir, fileName) => {
+  if (!fileName) {
+    throw new Error('Please, provide a file name!');
+  }
+  const filePath = path.resolve(__dirname, `../${fileName}`);
+
+  if (!fs.existsSync(filePath)) {
+    throw new Error(`File not exist: ${filePath}`);
+  }
+
+  return filePath;
+};
+
+const resolveFolderPath = (dir, relativeFolderPath) => {
+  if (!relativeFolderPath) {
+    throw new Error('Please, provide a folder path!');
+  }
+  const folderPath = path.resolve(__dirname, `../${relativeFolderPath}`);
+
+  if (!fs.existsSync(folderPath)) {
+    throw new Error(`Folder not exist: ${folderPath}`);
+  }
+
+  return folderPath;
+};
+
+const replaceExt = (npath, ext) => {
+  if (typeof npath !== 'string') {
+    return npath;
+  }
+
+  if (npath.length === 0) {
+    return npath;
+  }
+
+  var nFileName = path.basename(npath, path.extname(npath)) + ext;
+  return path.join(path.dirname(npath), nFileName);
+}
+
+module.exports = {
+  resolveFilePath,
+  resolveFolderPath,
+  replaceExt
+}
diff --git a/hw3/utils/lib/reverse.js b/hw3/utils/lib/reverse.js
new file mode 100644
index 0000000..3ef10ed
--- /dev/null
+++ b/hw3/utils/lib/reverse.js
@@ -0,0 +1,16 @@
+const through = require('through2');
+
+module.exports = (stdIn, stdOut) => {
+  const transform = function (buffer, encoding, next) {
+    const input = buffer.toString();
+
+    const strArray = input.split('');
+    strArray.unshift(strArray.pop())
+    const output = strArray.reverse().join('');
+
+    this.push(output);
+    next();
+  };
+
+  stdIn.pipe(through(transform)).pipe(stdOut);
+}
diff --git a/hw3/utils/lib/transform.js b/hw3/utils/lib/transform.js
new file mode 100644
index 0000000..1beac92
--- /dev/null
+++ b/hw3/utils/lib/transform.js
@@ -0,0 +1,10 @@
+const through = require('through2');
+
+module.exports = (stdin, stdout) => {
+  const transform = function (buffer, encoding, next) {
+    this.push(buffer.toString().toUpperCase());
+    next();
+  }
+
+  stdin.pipe(through(transform)).pipe(stdout);
+}
diff --git a/hw3/utils/streams.js b/hw3/utils/streams.js
new file mode 100644
index 0000000..d47466e
--- /dev/null
+++ b/hw3/utils/streams.js
@@ -0,0 +1,44 @@
+const program = require('commander');
+const pUtils = require('./lib/path-utils');
+
+program
+  .version('0.1.0')
+  .option('-a, --action [value]', 'Provide necessary action name')
+  .option('-f, --file [value]', 'File name')
+  .option('-p, --path [value]', 'Folder path')
+  .parse(process.argv);
+
+try {
+  let filePath;
+  switch (program.action) {
+    case 'reverse':
+      require('./lib/reverse')(process.stdin, process.stdout);
+      break;
+    case 'transform':
+      require('./lib/transform')(process.stdin, process.stdout);
+      break;
+    case 'outputFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/output-file')(filePath, process.stdout);
+      break;
+    case 'convertFromFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/convert-from-file')(filePath, process.stdout);
+      break;
+    case 'convertToFile':
+      filePath = pUtils.resolveFilePath(__dirname, program.file);
+      require('./lib/convert-to-file')(filePath);
+      break;
+    case 'cssBundler':
+      const folderPath = pUtils.resolveFolderPath(__dirname, program.path);
+      require('./lib/css-bundler')(folderPath);
+      break;
+    default:
+      console.error('Wrong input parameters!')
+      program.help();
+      break;
+  }
+} catch (error) {
+  console.error('Something went wrong!')
+  console.error(`Error: ${error.message || error}`);
+}
diff --git a/hw3/utils/users.csv b/hw3/utils/users.csv
new file mode 100644
index 0000000..26c93ee
--- /dev/null
+++ b/hw3/utils/users.csv
@@ -0,0 +1,3 @@
+user_id,first_name,last_name,timestamp
+4a5a0930-faac-11e7-8c3f-9a214cf093ae,John,Snow,2017-01-23 03:00:00+03
+510c3e42-faac-11e7-8c3f-9a214cf093ae,Sam,Smith,2017-01-23 03:00:00+04
diff --git a/hw3/utils/users.txt b/hw3/utils/users.txt
new file mode 100644
index 0000000..fa87013
--- /dev/null
+++ b/hw3/utils/users.txt
@@ -0,0 +1,3 @@
+Bob
+Jack
+Bill
diff --git a/hw4/.babelrc b/hw4/.babelrc
new file mode 100644
index 0000000..002b4aa
--- /dev/null
+++ b/hw4/.babelrc
@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}
diff --git a/hw4/.eslintrc b/hw4/.eslintrc
new file mode 100644
index 0000000..162fc5c
--- /dev/null
+++ b/hw4/.eslintrc
@@ -0,0 +1,3 @@
+{
+  "extends": "es2015"
+}
diff --git a/hw4/app.js b/hw4/app.js
new file mode 100644
index 0000000..9616b74
--- /dev/null
+++ b/hw4/app.js
@@ -0,0 +1,16 @@
+const express = require('express');
+const app = express();
+
+import cookieParser from './middlewares/cookie-parser';
+import queryParser from './middlewares/query-parser';
+
+cookieParser({ app });
+queryParser({ app });
+
+import users from './routes/users';
+import products from './routes/products';
+
+app.use('/api/users', users)
+app.use('/api/products', products);
+
+module.exports = app;
\ No newline at end of file
diff --git a/hw4/http-servers/echo-server.js b/hw4/http-servers/echo-server.js
new file mode 100644
index 0000000..43e64d8
--- /dev/null
+++ b/hw4/http-servers/echo-server.js
@@ -0,0 +1,12 @@
+const Http = require('http');
+
+const server = Http.createServer();
+
+server.on('request', (req, res) => {
+  console.log(`incoming ${req.method} request ${req.url}`)
+  res.writeHead(200);
+  req.pipe(res);
+});
+
+const port = process.env.PORT || 3000;
+server.listen(port, () => { console.log(`Listening on port ${port}...`) });
diff --git a/hw4/http-servers/html-server.js b/hw4/http-servers/html-server.js
new file mode 100644
index 0000000..9d6b4e0
--- /dev/null
+++ b/hw4/http-servers/html-server.js
@@ -0,0 +1,15 @@
+const Http = require('http');
+const fs = require('fs');
+
+const server = Http.createServer();
+
+server.on('request', (req, res) => {
+  console.log(`incoming ${req.method} request ${req.url}`)
+  res.writeHead(200, {
+    'Content-Type': 'text/html'
+  });
+  fs.createReadStream('./index.html').pipe(res);
+});
+
+const port = process.env.PORT || 3000;
+server.listen(port, () => { console.log(`Listening on port ${port}...`) });
diff --git a/hw4/http-servers/index.html b/hw4/http-servers/index.html
new file mode 100644
index 0000000..6209469
--- /dev/null
+++ b/hw4/http-servers/index.html
@@ -0,0 +1,6 @@
+<html>
+    <head></head>
+    <body>
+        <h1>{message}</h1>
+    </body>
+</html>
diff --git a/hw4/http-servers/json-server.js b/hw4/http-servers/json-server.js
new file mode 100644
index 0000000..595d1ed
--- /dev/null
+++ b/hw4/http-servers/json-server.js
@@ -0,0 +1,24 @@
+const Http = require('http');
+
+const server = Http.createServer();
+
+server.on('request', (req, res) => {
+  console.log(`incoming ${req.method} request ${req.url}`)
+  res.writeHead(200, {
+    'Content-Type': 'application/json'
+  });
+  const product = {
+    id: 1,
+    name: 'Supreme T-Shirt',
+    brand: 'Supreme',
+    price: 99.99,
+    options: [
+      { color: 'blue' },
+      { size: 'XL' }
+    ]
+  };
+  res.end(JSON.stringify(product));
+});
+
+const port = 3000;
+server.listen(port, () => { console.log(`Listening on port ${port}...`) });
diff --git a/hw4/http-servers/plain-text-server.js b/hw4/http-servers/plain-text-server.js
new file mode 100644
index 0000000..fd56dfc
--- /dev/null
+++ b/hw4/http-servers/plain-text-server.js
@@ -0,0 +1,14 @@
+const Http = require('http');
+
+const server = Http.createServer();
+
+server.on('request', (req, res) => {
+  console.log(`incoming ${req.method} request ${req.url}`)
+  res.writeHead(200, {
+    'Content-Type': 'text/plain'
+  });
+  res.end('Hello World');
+});
+
+const port = process.env.PORT || 3000;
+server.listen(port, () => { console.log(`Listening on port ${port}...`) });
diff --git a/hw4/index.js b/hw4/index.js
new file mode 100644
index 0000000..23e1688
--- /dev/null
+++ b/hw4/index.js
@@ -0,0 +1,3 @@
+import app from './app';
+const port = process.env.PORT || 3000;
+app.listen(port, () => console.log(`App listening on port ${port}!`))
diff --git a/hw4/middlewares/cookie-parser.js b/hw4/middlewares/cookie-parser.js
new file mode 100644
index 0000000..e71b57d
--- /dev/null
+++ b/hw4/middlewares/cookie-parser.js
@@ -0,0 +1,10 @@
+import cookieParser from 'cookie-parser';
+
+export default ({ app }) => {
+  app.use(cookieParser());
+
+  app.use((req, res, next) => {
+    req.parsedCookies = Object.assign({}, req.cookies);
+    next();
+  });
+};
diff --git a/hw4/middlewares/query-parser.js b/hw4/middlewares/query-parser.js
new file mode 100644
index 0000000..a1aa07f
--- /dev/null
+++ b/hw4/middlewares/query-parser.js
@@ -0,0 +1,6 @@
+export default ({ app }) => {
+  app.use((req, res, next) => {
+    req.parsedQuery = req.query;
+    next();
+  });
+};
diff --git a/hw4/models/index.js b/hw4/models/index.js
new file mode 100644
index 0000000..f01c653
--- /dev/null
+++ b/hw4/models/index.js
@@ -0,0 +1,4 @@
+import { User } from './user';
+import { Product } from './product';
+
+export { User, Product };
diff --git a/hw4/models/product/index.js b/hw4/models/product/index.js
new file mode 100644
index 0000000..bd83987
--- /dev/null
+++ b/hw4/models/product/index.js
@@ -0,0 +1,52 @@
+export class Product {
+  constructor() {
+    console.log('Product module');
+
+    this.id = 6;
+    this.products = [
+      {
+        id: 1,
+        reviews: [1, 2, 3]
+      },
+      {
+        id: 2,
+        reviews: [4, 5, 6]
+      },
+      {
+        id: 3,
+        reviews: [7, 8, 9]
+      },
+      {
+        id: 4,
+        reviews: [10, 11, 12]
+      },
+      {
+        id: 5,
+        reviews: [13, 14, 15]
+      }
+    ];
+  }
+
+  getAllProducts() {
+    return this.products;
+  }
+
+  getProductById(id) {
+    return this.products.filter(product => product.id === +id)[0];
+  }
+
+  getProductReviews(id) {
+    return this.getProductById(id).reviews;
+  }
+
+  addProduct() {
+    const newProduct = {
+      id: this.id++,
+      reviews: []
+    };
+
+    this.products.push(newProduct);
+
+    return newProduct;
+  }
+}
diff --git a/hw4/models/user/index.js b/hw4/models/user/index.js
new file mode 100644
index 0000000..194a198
--- /dev/null
+++ b/hw4/models/user/index.js
@@ -0,0 +1,24 @@
+export class User {
+  constructor() {
+    console.log('User module');
+
+    this.users = [
+      {
+        email: '1',
+        password: '1'
+      },
+      {
+        email: '2',
+        password: '2'
+      }
+    ];
+  }
+
+  getAllUsers() {
+    return this.users;
+  }
+
+  getUser(email) {
+    return this.users.filter(user => user.email = email)[0];
+  }
+}
diff --git a/hw4/package-lock.json b/hw4/package-lock.json
new file mode 100644
index 0000000..9dc8f0a
--- /dev/null
+++ b/hw4/package-lock.json
@@ -0,0 +1,4482 @@
+{
+  "name": "hw4",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "dev": true
+    },
+    "accepts": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
+      "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
+      "requires": {
+        "mime-types": "~2.1.18",
+        "negotiator": "0.6.1"
+      }
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+    "ansi-align": {
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+      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz",
+      "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=",
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+      "requires": {
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+    "ansi-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
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+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
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+}
diff --git a/hw4/package.json b/hw4/package.json
new file mode 100644
index 0000000..78019f6
--- /dev/null
+++ b/hw4/package.json
@@ -0,0 +1,31 @@
+{
+  "name": "hw4",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon --exec npm run babel",
+    "babel": "babel-node index.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/okachynskyy/nodejs-homeworks.git"
+  },
+  "author": "Oleksiy Kachynskyy <oleksiy.kachynskyy@gmail.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/okachynskyy/nodejs-homeworks/issues"
+  },
+  "homepage": "https://github.com/okachynskyy/nodejs-homeworks#readme",
+  "description": "",
+  "dependencies": {
+    "cookie-parser": "^1.4.3",
+    "express": "^4.16.3"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-preset-env": "^1.6.1",
+    "babel-preset-stage-2": "^6.24.1",
+    "babel-register": "^6.26.0",
+    "nodemon": "^1.18.3"
+  }
+}
diff --git a/hw4/readme.md b/hw4/readme.md
new file mode 100644
index 0000000..6a4b392
--- /dev/null
+++ b/hw4/readme.md
@@ -0,0 +1,21 @@
+## http-servers
+CD to `http-servers` folder and execute
+
+- plain-text-server
+
+  `node plain-text-server.js`
+
+- html-server
+
+  `node html-server.js`
+
+- json-server
+
+  `node json-server.js`
+
+- echo server (test `curl -d 'test' localhost:3000`)
+
+  `node echo-server.js`
+
+# App with routes
+  run `npm start`
diff --git a/hw4/routes/products.js b/hw4/routes/products.js
new file mode 100644
index 0000000..b23bd12
--- /dev/null
+++ b/hw4/routes/products.js
@@ -0,0 +1,24 @@
+var express = require('express')
+var router = express.Router()
+
+import { Product } from '../models/product';
+
+const product = new Product();
+
+router.get('/', (req, res) => {
+  res.json(product.getAllProducts());
+});
+
+router.get('/:id', (req, res) => {
+  res.json(product.getProductById(req.params.id));
+});
+
+router.get('/:id/reviews', (req, res) => {
+  res.json(product.getProductReviews(req.params.id));
+});
+
+router.post('/', (req, res) => {
+  res.json(product.addProduct());
+});
+
+module.exports = router
\ No newline at end of file
diff --git a/hw4/routes/users.js b/hw4/routes/users.js
new file mode 100644
index 0000000..de7223e
--- /dev/null
+++ b/hw4/routes/users.js
@@ -0,0 +1,11 @@
+var express = require('express')
+var router = express.Router()
+
+import { User } from '../models/user';
+const users = new User();
+
+router.get('/', (req, res) => {
+  res.json(users.getAllUsers());
+});
+
+module.exports = router
\ No newline at end of file