diff --git a/models/contacts.js b/models/contacts.js
index 409d11c7c09..372279deb68 100644
--- a/models/contacts.js
+++ b/models/contacts.js
@@ -1,14 +1,120 @@
-// const fs = require('fs/promises')
+const { v4: uuidv4 } = require("uuid");
+const fs = require('fs').promises;
+const path = require('path');
+const contactsPath = path.join(__dirname, 'contacts.json');
 
-const listContacts = async () => {}
+const listContacts = async () => {
+  try {
+    const data = await fs.readFile(contactsPath);
+    const contacts = JSON.parse(data);
+    return contacts;
+  } catch (err) {
+    console.error("Error reading contacts file in listContacts:", err);
+    throw err;
+  }
+};
 
-const getContactById = async (contactId) => {}
+const getContactById = async (contactId) => {
+  let contacts;
+  
+  try {
+    const data = await fs.readFile(contactsPath);
+    contacts = JSON.parse(data);
+  } catch (err) {
+    console.error("Error reading contacts file in getContactById:", err);
+    throw err;
+  }
 
-const removeContact = async (contactId) => {}
+  const contact = contacts.filter((contact) => contact.id === contactId);
+  if (contact.length === 0) {
+    return null;
+  }
+  return contact;
+};
 
-const addContact = async (body) => {}
+const removeContact = async (contactId) => {
+  let contacts;
 
-const updateContact = async (contactId, body) => {}
+  try {
+    contacts = await listContacts();
+  } catch (err) {
+    console.error("Error reading contacts file in removeContact:", err);
+    throw err;
+  }
+
+  const index = contacts.findIndex((contact) => contact.id === contactId);
+  if (index === -1) {
+    return null;
+  }
+
+  contacts.splice(index, 1);
+
+  try {
+    await fs.writeFile(contactsPath, JSON.stringify(contacts, null, 2));
+  } catch (err) {
+    console.error("Error writing to contacts file in removeContact:", err);
+    throw err;
+  }
+
+  return contacts;
+};
+
+const addContact = async (body) => {
+  let contacts;
+
+  try {
+    contacts = await listContacts();
+  } catch (err) {
+    console.error("Error reading contacts file in addContact:", err);
+    throw err;
+  }
+
+  const newContact = {
+    id: uuidv4(),
+    ...body,
+  };
+
+  contacts.push(newContact);
+
+  try {
+    await fs.writeFile(contactsPath, JSON.stringify(contacts, null, 2));
+    return newContact;
+  } catch (err) {
+    console.error("Error writing to contacts file in addContact:", err);
+    throw err;
+  }
+};
+
+const updateContact = async (contactId, body) => {
+  let contacts;
+
+  try {
+    contacts = await listContacts();
+  } catch (err) {
+    console.error("Error reading contacts file in updateContact:", err);
+    throw err;
+  }
+
+  const index = contacts.findIndex((contact) => contact.id === contactId);
+  if (index === -1) {
+    return null;
+  }
+
+  const newContact = {
+    id: uuidv4(),
+    ...body,
+  };
+
+  contacts.splice(index, 1, newContact);
+
+  try {
+    await fs.writeFile(contactsPath, JSON.stringify(contacts, null, 2));
+    return newContact;
+  } catch (err) {
+    console.error("Error writing to contacts file in updateContact:", err);
+    throw err;
+  }
+};
 
 module.exports = {
   listContacts,
diff --git a/package-lock.json b/package-lock.json
index e6d047044e5..69d0c59d6cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,9 @@
         "cors": "2.8.5",
         "cross-env": "7.0.3",
         "express": "4.17.1",
-        "morgan": "1.10.0"
+        "joi": "^17.13.3",
+        "morgan": "1.10.0",
+        "uuid": "^11.1.0"
       },
       "devDependencies": {
         "eslint": "7.19.0",
@@ -141,6 +143,42 @@
         "node": "^10.12.0 || >=12.0.0"
       }
     },
+    "node_modules/@hapi/hoek": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz",
+      "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@hapi/topo": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz",
+      "integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "node_modules/@sideway/address": {
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/@sideway/address/-/address-4.1.5.tgz",
+      "integrity": "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "node_modules/@sideway/formula": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sideway/formula/-/formula-3.0.1.tgz",
+      "integrity": "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@sideway/pinpoint": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sideway/pinpoint/-/pinpoint-2.0.0.tgz",
+      "integrity": "sha512-RNiOoTPkptFtSVzQevY/yWtZwf/RxyVnPy/OcA9HBM3MlGDnBEYL5B41H0MTn0Uec8Hi+2qUtTfG2WWZBmMejQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/@sindresorhus/is": {
       "version": "0.14.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
@@ -2166,6 +2204,19 @@
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
     },
+    "node_modules/joi": {
+      "version": "17.13.3",
+      "resolved": "https://registry.npmjs.org/joi/-/joi-17.13.3.tgz",
+      "integrity": "sha512-otDA4ldcIx+ZXsKHWmp0YizCweVRZG96J10b0FevjfuncLO1oX59THoAmHkNubYJ+9gWsYsp5k8v4ib6oDv1fA==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@hapi/hoek": "^9.3.0",
+        "@hapi/topo": "^5.1.0",
+        "@sideway/address": "^4.1.5",
+        "@sideway/formula": "^3.0.1",
+        "@sideway/pinpoint": "^2.0.0"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -3544,6 +3595,19 @@
         "node": ">= 0.4.0"
       }
     },
+    "node_modules/uuid": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
+      "integrity": "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
     "node_modules/v8-compile-cache": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
@@ -3757,6 +3821,37 @@
         "strip-json-comments": "^3.1.1"
       }
     },
+    "@hapi/hoek": {
+      "version": "9.3.0",
+      "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz",
+      "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ=="
+    },
+    "@hapi/topo": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz",
+      "integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==",
+      "requires": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "@sideway/address": {
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/@sideway/address/-/address-4.1.5.tgz",
+      "integrity": "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q==",
+      "requires": {
+        "@hapi/hoek": "^9.0.0"
+      }
+    },
+    "@sideway/formula": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sideway/formula/-/formula-3.0.1.tgz",
+      "integrity": "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg=="
+    },
+    "@sideway/pinpoint": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sideway/pinpoint/-/pinpoint-2.0.0.tgz",
+      "integrity": "sha512-RNiOoTPkptFtSVzQevY/yWtZwf/RxyVnPy/OcA9HBM3MlGDnBEYL5B41H0MTn0Uec8Hi+2qUtTfG2WWZBmMejQ=="
+    },
     "@sindresorhus/is": {
       "version": "0.14.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
@@ -5269,6 +5364,18 @@
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
     },
+    "joi": {
+      "version": "17.13.3",
+      "resolved": "https://registry.npmjs.org/joi/-/joi-17.13.3.tgz",
+      "integrity": "sha512-otDA4ldcIx+ZXsKHWmp0YizCweVRZG96J10b0FevjfuncLO1oX59THoAmHkNubYJ+9gWsYsp5k8v4ib6oDv1fA==",
+      "requires": {
+        "@hapi/hoek": "^9.3.0",
+        "@hapi/topo": "^5.1.0",
+        "@sideway/address": "^4.1.5",
+        "@sideway/formula": "^3.0.1",
+        "@sideway/pinpoint": "^2.0.0"
+      }
+    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -6326,6 +6433,11 @@
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
     },
+    "uuid": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
+      "integrity": "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A=="
+    },
     "v8-compile-cache": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
diff --git a/package.json b/package.json
index 5045e827160..380978dcdbc 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,9 @@
     "cors": "2.8.5",
     "cross-env": "7.0.3",
     "express": "4.17.1",
-    "morgan": "1.10.0"
+    "joi": "^17.13.3",
+    "morgan": "1.10.0",
+    "uuid": "^11.1.0"
   },
   "devDependencies": {
     "eslint": "7.19.0",
diff --git a/routes/api/contacts.js b/routes/api/contacts.js
index a60ebd69231..7f72e6374d2 100644
--- a/routes/api/contacts.js
+++ b/routes/api/contacts.js
@@ -1,25 +1,127 @@
+const Joi = require("joi");
+const contactsFunctions = require("../../models/contacts.js");
+
+const schema = Joi.object({
+  name: Joi.string().required(),
+  email: Joi.string()
+    .email({
+      minDomainSegments: 2,
+      tlds: { allow: ["com", "net"] },
+    })
+    .required(),
+  phone: Joi.number().integer().positive().required(),
+});
+
+
+
+
 const express = require('express')
 
 const router = express.Router()
 
 router.get('/', async (req, res, next) => {
-  res.json({ message: 'template message' })
-})
+  try {
+    const contacts = await contactsFunctions.listContacts();
+    res.json({
+      status: 200,
+      data: { contacts },
+    });
+  } catch (err) {
+    console.error(err);
+    next(err);
+  }
+});
 
 router.get('/:contactId', async (req, res, next) => {
-  res.json({ message: 'template message' })
-})
+  try {
+    const contactId = req.params.contactId;
+    const contact = await contactsFunctions.getContactById(contactId);
+    if (contact) {
+      res.json({
+        status: 200,
+        data: { contact },
+      });
+    } else {
+      res.status(404).json({
+        status: 404,
+        message: "Not found",
+      });
+    }
+  } catch (err) {
+    console.error(err);
+    next(err);
+  }
+});
 
 router.post('/', async (req, res, next) => {
-  res.json({ message: 'template message' })
-})
+  const { error } = schema.validate(req.body);
+  if (error) {
+    res.status(400).json({
+      status: 400,
+      message: error.message,
+    });
+  } else {
+    try {
+      const newContact = await contactsFunctions.addContact(req.body);
+      res.json({
+        status: 201,
+        data: { newContact },
+      });
+    } catch (err) {
+      console.error(err);
+      next(err);
+    }
+  }
+});
 
 router.delete('/:contactId', async (req, res, next) => {
-  res.json({ message: 'template message' })
-})
+  try {
+    const contactId = req.params.contactId;
+    const index = await contactsFunctions.removeContact(contactId);
+    if (index !== -1) {
+      res.json({
+        status: 200,
+        message: "contact deleted",
+      });
+    } else {
+      res.status(404).json({
+        status: 404,
+        message: "Not found",
+      });
+    }
+  } catch (err) {
+    console.error(err);
+    next(err);
+  }
+});
 
 router.put('/:contactId', async (req, res, next) => {
-  res.json({ message: 'template message' })
-})
+  const contactId = req.params.contactId;
+  const { error } = schema.validate(req.body);
+  if (error) {
+    res.status(400).json({
+      status: 400,
+      message: error.message,
+    });
+  } else {
+    try {
+      const newContact = await contactsFunctions.updateContact(contactId, req.body);
+      if (newContact) {
+        res.json({
+          status: 200,
+          data: { newContact },
+        });
+      } else {
+        res.status(404).json({
+          status: 404,
+          message: "Not found",
+        });
+      }
+    } catch (err) {
+      console.error(err);
+      next(err);
+    }
+  }
+});
 
 module.exports = router