diff --git a/contacts-endpoints-lifecycle.png b/contacts-endpoints-lifecycle.png
new file mode 100644
index 0000000..2db4a9b
Binary files /dev/null and b/contacts-endpoints-lifecycle.png differ
diff --git a/package-lock.json b/package-lock.json
index 3fb12fd..23780a3 100644
--- a/package-lock.json
+++ b/package-lock.json
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       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/pstree.remy/-/pstree.remy-1.1.8.tgz",
-      "integrity": "sha512-77DZwxQmxKnu3aR542U+X8FypNzbfJ+C5XQDk3uWjWxn6151aIMGthWYRXTqT1E5oJvg+ljaa2OJi+VfvCOQ8w=="
+      "integrity": "sha512-77DZwxQmxKnu3aR542U+X8FypNzbfJ+C5XQDk3uWjWxn6151aIMGthWYRXTqT1E5oJvg+ljaa2OJi+VfvCOQ8w==",
+      "dev": true
+    },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "engines": {
+        "node": ">=6"
+      }
     },
     "node_modules/pure-rand": {
       "version": "6.0.4",
@@ -4013,9 +4085,9 @@
       }
     },
     "node_modules/raw-body": {
-      "version": "2.5.1",
-      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.1.tgz",
-      "integrity": "sha512-qqJBtEyVgS0ZmPGdCFPWJ3FreoqvG4MVQln/kCgF7Olq95IbOp0/BWyMwbdtn4VTvkM8Y7khCQ2Xgk/tcrCXig==",
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.2.tgz",
+      "integrity": "sha512-8zGqypfENjCIqGhgXToC8aB2r7YrBX+AQAfIPs/Mlk+BtPTztOvTS01NRW/3Eh60J+a48lt8qsCzirQ6loCVfA==",
       "dependencies": {
         "bytes": "3.1.2",
         "http-errors": "2.0.0",
@@ -4036,6 +4108,7 @@
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.6.0.tgz",
       "integrity": "sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==",
+      "dev": true,
       "dependencies": {
         "picomatch": "^2.2.1"
       },
@@ -4237,6 +4310,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-2.0.0.tgz",
       "integrity": "sha512-a2B9Y0KlNXl9u/vsW6sTIu9vGEpfKu2wRV6l1H3XEas/0gUIzGzBoP/IouTcUQbm9JWZLH3COxyn03TYlFax6w==",
+      "dev": true,
       "dependencies": {
         "semver": "^7.5.3"
       },
@@ -4248,6 +4322,7 @@
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
       "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dev": true,
       "dependencies": {
         "yallist": "^4.0.0"
       },
@@ -4259,6 +4334,7 @@
       "version": "7.5.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
       "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dev": true,
       "dependencies": {
         "lru-cache": "^6.0.0"
       },
@@ -4272,7 +4348,8 @@
     "node_modules/simple-update-notifier/node_modules/yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
     },
     "node_modules/sisteransi": {
       "version": "1.0.5",
@@ -4562,6 +4639,7 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
       "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "dev": true,
       "dependencies": {
         "is-number": "^7.0.0"
       },
@@ -4577,10 +4655,26 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/topo": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/topo/-/topo-3.0.3.tgz",
+      "integrity": "sha512-IgpPtvD4kjrJ7CRA3ov2FhWQADwv+Tdqbsf1ZnPUSAtCJ9e1Z44MmoSGDXGk4IppoZA7jd/QRkNddlLJWlUZsQ==",
+      "deprecated": "This module has moved and is now available at @hapi/topo. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.",
+      "dependencies": {
+        "hoek": "6.x.x"
+      }
+    },
+    "node_modules/topo/node_modules/hoek": {
+      "version": "6.1.3",
+      "resolved": "https://registry.npmjs.org/hoek/-/hoek-6.1.3.tgz",
+      "integrity": "sha512-YXXAAhmF9zpQbC7LEcREFtXfGq5K1fmd+4PHkBq8NUqmzW3G+Dq10bI/i0KucLRwss3YYFQ0fSfoxBZYiGUqtQ==",
+      "deprecated": "This module has moved and is now available at @hapi/hoek. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues."
+    },
     "node_modules/touch": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
       "integrity": "sha512-WBx8Uy5TLtOSRtIq+M03/sKDrXCLHxwDcquSP2c43Le03/9serjQBIztjRz6FkJez9D/hleyAXTBGLwwZUw9lA==",
+      "dev": true,
       "dependencies": {
         "nopt": "~1.0.10"
       },
@@ -4624,7 +4718,8 @@
     "node_modules/undefsafe": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/undefsafe/-/undefsafe-2.0.5.tgz",
-      "integrity": "sha512-WxONCrssBM8TSPRqN5EmsjVrsv4A8X12J4ArBiiayv3DyyG3ZlIg6yysuuSYdZsVz3TKcTg2fd//Ujd4CHV1iA=="
+      "integrity": "sha512-WxONCrssBM8TSPRqN5EmsjVrsv4A8X12J4ArBiiayv3DyyG3ZlIg6yysuuSYdZsVz3TKcTg2fd//Ujd4CHV1iA==",
+      "dev": true
     },
     "node_modules/undici-types": {
       "version": "5.26.5",
diff --git a/package.json b/package.json
index ec6510a..fe2feeb 100644
--- a/package.json
+++ b/package.json
@@ -20,12 +20,13 @@
   "homepage": "https://github.com/boolean-uk/api-address-book#readme",
   "dependencies": {
     "cors": "^2.8.5",
-    "express": "^4.18.2",
-    "morgan": "^1.10.0",
-    "nodemon": "^3.0.1"
+    "express": "^4.19.2",
+    "joi": "^13.1.0",
+    "morgan": "^1.10.0"
   },
   "devDependencies": {
     "jest": "^29.7.0",
+    "nodemon": "^3.1.3",
     "supertest": "^6.2.3"
   }
 }
diff --git a/src/server.js b/src/server.js
index 30f0ce3..f4f3a2e 100644
--- a/src/server.js
+++ b/src/server.js
@@ -1,13 +1,166 @@
-const express = require("express")
-const morgan = require("morgan")
-const cors = require("cors")
-const app = express()
+const express = require("express");
+const Joi = require("joi");
+const morgan = require("morgan");
+const cors = require("cors");
+const app = express();
 
-app.use(morgan("dev"))
-app.use(cors())
-app.use(express.json())
+app.use(morgan("dev"));
+app.use(cors());
+app.use(express.json());
 
-// write your app code here
+const contacts = require("../data/contacts");
+const meetings = require("../data/meetings");
 
+// 1- Contacts
+// a) Helper functions
+function findContact(req, res) {
+  const id = Number.parseInt(req.params.id, 10);
+  const contact = contacts.find((contact) => contact.id === id);
 
-module.exports = app
+  if (!contact)
+    return res.status(404).send(`The contact with ID ${id} is not found.`);
+
+  return contact;
+}
+
+function validateContact(req, res) {
+  const schema = {
+    firstName: Joi.string().required(),
+    lastName: Joi.string().required(),
+    street: Joi.string().required(),
+    city: Joi.string().required(),
+    type: Joi.string().required(),
+    email: Joi.string().required(),
+    linkedin: Joi.string().required(),
+    twitter: Joi.string().required(),
+  };
+
+  const { error } = Joi.validate(req.body, schema);
+
+  if (error) {
+    return res.status(400).send(error.details[0].message);
+  }
+}
+
+// b) API verbs
+app.get("/contacts", (req, res) => {
+  res.status(200).json({ contacts: contacts });
+});
+
+app.post("/contacts", (req, res) => {
+  validateContact(req, res);
+
+  const id = contacts[contacts.length - 1].id + 1;
+  const contact = Object.assign({ id }, req.body);
+
+  contacts.push(contact);
+  res.status(201).json({ contact });
+});
+
+app.get("/contacts/:id", (req, res) => {
+  const contact = findContact(req, res);
+
+  res.status(200).json({ contact });
+});
+
+app.delete("/contacts/:id", (req, res) => {
+  const contact = findContact(req, res);
+
+  const index = contacts.indexOf(contact);
+  contacts.splice(index, 1);
+
+  for (let key of meetings) {
+    if (key?.contactId === contact.id) {
+      meetings.splice(meetings.indexOf(key), 1);
+    }
+  }
+
+  res.status(200).json({ contact });
+});
+
+app.put("/contacts/:id", (req, res) => {
+  const contact = findContact(req, res);
+
+  validateContact(req, res);
+
+  contacts[contacts.indexOf(contact)] = { ...contact, ...req.body };
+
+  res.status(200).json({ contact: { ...contact, ...req.body } });
+});
+
+// 2- Meetings
+// a) Helper functions
+function findMeeting(req, res) {
+  const id = Number.parseInt(req.params.id, 10);
+  const meeting = meetings.find((meeting) => meeting.id === id);
+
+  if (!meeting)
+    return res.status(404).send(`The meeting with ID ${id} is not found.`);
+
+  return meeting;
+}
+
+function validateMeeting(req, res) {
+  const schema = {
+    name: Joi.string().required(),
+  };
+
+  const { error } = Joi.validate(req.body, schema);
+
+  if (error) return res.status(400).send(error.details[0].message);
+}
+
+// b) API verbs
+app.get("/meetings", (req, res) => {
+  res.status(200).json({ meetings });
+});
+
+app.get("/meetings/:id", (req, res) => {
+  const meeting = findMeeting(req, res);
+
+  res.status(200).json({ meeting });
+});
+
+app.delete("/meetings/:id", (req, res) => {
+  const meeting = findMeeting(req, res);
+
+  const index = meetings.indexOf(meeting);
+
+  meetings.splice(index, 1);
+  res.status(200).json({ meeting });
+});
+
+app.put("/meetings/:id", (req, res) => {
+  const meeting = findMeeting(req, res);
+
+  validateMeeting(req, res);
+
+  meeting.name = req.body.name;
+  res.status(200).json({ meeting });
+});
+
+app.get("/contacts/:id/meetings", (req, res) => {
+  const contactMeetings = meetings.filter(
+    (meeting) => meeting.contactId === findContact(req, res).id
+  );
+
+  if (!contactMeetings)
+    return res.status(404).send(`No meetings found for this contact.`);
+
+  res.status(200).json({ meetings: contactMeetings });
+});
+
+app.post("/contacts/:id/meetings", (req, res) => {
+  validateMeeting(req, res);
+
+  const meetingId = meetings[meetings.length - 1].id + 1;
+  const contactId = Number.parseInt(req.params.id, 10);
+
+  const newMeeting = Object.assign({ id: meetingId, contactId }, req.body);
+
+  meetings.push(newMeeting);
+
+  res.status(201).json({ meeting: newMeeting });
+});
+
+module.exports = app;
diff --git a/test/api/standard/contacts.spec.js b/test/api/standard/contacts.spec.js
index 4c430a8..4ff2de5 100644
--- a/test/api/standard/contacts.spec.js
+++ b/test/api/standard/contacts.spec.js
@@ -1,135 +1,129 @@
-const supertest = require('supertest')
+const supertest = require("supertest");
 
-describe('Address Book API', () => {
-  let app, createTestFormData, updateTestFormData
+describe("Address Book API", () => {
+  let app, createTestFormData, updateTestFormData;
 
   beforeEach(() => {
-    app = require('../../../src/server.js')
-    createTestFormData = require('../../fixtures/contacts/createTestFormData.js')
-    updateTestFormData = require('../../fixtures/contacts/updateTestFormData.js')
-  })
-
-  describe('GET /contacts', () => {
-    it('returns default contacts', async () => {
-      const response = await supertest(app).get('/contacts')
-
-      expect(response.status).toEqual(200)
-      expect(response.body.contacts).not.toEqual(undefined)
-      expect(response.body.contacts.length).toEqual(2)
-
-      const [contact1, contact2] = response.body.contacts
-      expect(contact1.firstName).toEqual("John")
-      expect(contact1.lastName).toEqual("Carmack")
-      expect(contact2.firstName).toEqual("Grace")
-      expect(contact2.lastName).toEqual("Hopper")
-    })
-  })
-
-  describe('GET /contacts/:id', () => {
-    it('returns contact, id 2', async () => {
-      const response = await supertest(app).get('/contacts/2')
-
-      expect(response.status).toEqual(200)
-      expect(response.body.contact).not.toEqual(undefined)
-
-      const contact = response.body.contact
-      expect(contact.id).toEqual(2)
-      expect(contact.firstName).toEqual("Grace")
-      expect(contact.lastName).toEqual("Hopper")
-    })
-  })
-
-  describe('POST /contacts', () => {
-    it('returns created contact', async () => {
+    app = require("../../../src/server.js");
+    createTestFormData = require("../../fixtures/contacts/createTestFormData.js");
+    updateTestFormData = require("../../fixtures/contacts/updateTestFormData.js");
+  });
+
+  describe("GET /contacts", () => {
+    it("returns default contacts", async () => {
+      const response = await supertest(app).get("/contacts");
+
+      expect(response.status).toEqual(200);
+      expect(response.body.contacts).not.toEqual(undefined);
+      expect(response.body.contacts.length).toEqual(2);
+
+      const [contact1, contact2] = response.body.contacts;
+      expect(contact1.firstName).toEqual("John");
+      expect(contact1.lastName).toEqual("Carmack");
+      expect(contact2.firstName).toEqual("Grace");
+      expect(contact2.lastName).toEqual("Hopper");
+    });
+  });
+
+  describe("GET /contacts/:id", () => {
+    it("returns contact, id 2", async () => {
+      const response = await supertest(app).get("/contacts/2");
+
+      expect(response.status).toEqual(200);
+      expect(response.body.contact).not.toEqual(undefined);
+
+      const contact = response.body.contact;
+      expect(contact.id).toEqual(2);
+      expect(contact.firstName).toEqual("Grace");
+      expect(contact.lastName).toEqual("Hopper");
+    });
+  });
+
+  describe("POST /contacts", () => {
+    it("returns created contact", async () => {
       const response = await supertest(app)
-        .post('/contacts')
-        .send(createTestFormData)
+        .post("/contacts")
+        .send(createTestFormData);
 
-      expect(response.status).toEqual(201)
-      expect(response.body.contact).not.toEqual(undefined)
+      expect(response.status).toEqual(201);
+      expect(response.body.contact).not.toEqual(undefined);
 
-      const contact = response.body.contact
-      expect(contact.id).toEqual(3)
-      expect(contact.firstName).toEqual(createTestFormData.firstName)
-      expect(contact.lastName).toEqual(createTestFormData.lastName)
-    })
+      const contact = response.body.contact;
+      expect(contact.id).toEqual(3);
+      expect(contact.firstName).toEqual(createTestFormData.firstName);
+      expect(contact.lastName).toEqual(createTestFormData.lastName);
+    });
 
-    it('adds contact to data store', async () => {
-      await supertest(app)
-        .post('/contacts')
-        .send(createTestFormData)
+    it("adds contact to data store", async () => {
+      await supertest(app).post("/contacts").send(createTestFormData);
 
-      const response = await supertest(app).get('/contacts')
+      const response = await supertest(app).get("/contacts");
 
-      expect(response.status).toEqual(200)
-      expect(response.body.contacts).not.toEqual(undefined)
-      expect(response.body.contacts.length).toEqual(3)
+      expect(response.status).toEqual(200);
+      expect(response.body.contacts).not.toEqual(undefined);
+      expect(response.body.contacts.length).toEqual(3);
 
-      const [contact1, contact2, contact3] = response.body.contacts
-      expect(contact3.firstName).toEqual(createTestFormData.firstName)
-      expect(contact3.lastName).toEqual(createTestFormData.lastName)
-    })
-  })
+      const [contact1, contact2, contact3] = response.body.contacts;
+      expect(contact3.firstName).toEqual(createTestFormData.firstName);
+      expect(contact3.lastName).toEqual(createTestFormData.lastName);
+    });
+  });
 
-  describe('PUT /contacts', () => {
-    let updatedContact
+  describe("PUT /contacts", () => {
+    let updatedContact;
     beforeEach(() => {
       updatedContact = {
         ...updateTestFormData,
-        id: 1
-      }
-    })
-    it('returns updated contact', async () => {
+        id: 1,
+      };
+    });
+    it("returns updated contact", async () => {
       const response = await supertest(app)
         .put(`/contacts/1`)
-        .send(updateTestFormData)
+        .send(updateTestFormData);
 
-      expect(response.status).toEqual(200)
-      expect(response.body.contact).not.toEqual(undefined)
+      expect(response.status).toEqual(200);
+      expect(response.body.contact).not.toEqual(undefined);
 
-      const contact = response.body.contact
-      expect(contact).toMatchObject(updatedContact)
-    })
+      const contact = response.body.contact;
+      expect(contact).toMatchObject(updatedContact);
+    });
 
-    it('updated contact is in data store', async () => {
-      await supertest(app)
-        .put(`/contacts/1`)
-        .send(updateTestFormData)
+    it("updated contact is in data store", async () => {
+      await supertest(app).put(`/contacts/1`).send(updateTestFormData);
 
-      const response = await supertest(app).get('/contacts')
+      const response = await supertest(app).get("/contacts");
 
-      expect(response.status).toEqual(200)
-      expect(response.body.contacts).not.toEqual(undefined)
-      expect(response.body.contacts.length).toEqual(2)
+      expect(response.status).toEqual(200);
+      expect(response.body.contacts).not.toEqual(undefined);
+      expect(response.body.contacts.length).toEqual(2);
 
-      const [contact1, contact2] = response.body.contacts
-      expect(contact1.firstName).toEqual(updatedContact.firstName)
-      expect(contact1.lastName).toEqual(updatedContact.lastName)
-    })
-  })
+      const [contact1, contact2] = response.body.contacts;
+      expect(contact1.firstName).toEqual(updatedContact.firstName);
+      expect(contact1.lastName).toEqual(updatedContact.lastName);
+    });
+  });
 
-  describe('DELETE /contacts', () => {
-    it('returns deleted contact', async () => {
-      const response = await supertest(app)
-        .delete(`/contacts/1`)
+  describe("DELETE /contacts", () => {
+    it("returns deleted contact", async () => {
+      const response = await supertest(app).delete(`/contacts/1`);
 
-      expect(response.status).toEqual(200)
-      expect(response.body.contact).not.toEqual(undefined)
-      expect(response.body.contact.id).toEqual(1)
-    })
+      expect(response.status).toEqual(200);
+      expect(response.body.contact).not.toEqual(undefined);
+      expect(response.body.contact.id).toEqual(1);
+    });
 
-    it('removes contact from data store', async () => {
-      const response = await supertest(app)
-        .delete(`/contacts/1`)
+    it("removes contact from data store", async () => {
+      const response = await supertest(app).delete(`/contacts/1`);
 
-      const deletedContact = response.body.contact
+      const deletedContact = response.body.contact;
 
-      const response2 = await supertest(app).get('/contacts')
+      const response2 = await supertest(app).get("/contacts");
 
-      expect(response2.status).toEqual(200)
-      expect(response2.body.contacts).not.toEqual(undefined)
-      expect(response2.body.contacts.length).toEqual(1)
-      expect(response2.body.contacts).not.toContain(deletedContact)
-    })
-  })
-})
+      expect(response2.status).toEqual(200);
+      expect(response2.body.contacts).not.toEqual(undefined);
+      expect(response2.body.contacts.length).toEqual(1);
+      expect(response2.body.contacts).not.toContain(deletedContact);
+    });
+  });
+});