diff --git a/package-lock.json b/package-lock.json
index 59150ae..4d08cfe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1303,6 +1303,16 @@
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@@ -1481,6 +1491,15 @@
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@@ -2262,6 +2360,11 @@
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+        "fecha": "^4.2.0",
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@@ -3847,6 +4084,11 @@
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/one-time/-/one-time-1.0.0.tgz",
+      "integrity": "sha512-5DXOiRKwuSEcQ/l0kGCF6Q3jcADFv5tSmRaJck/OqkVFcOzutB134KRSfF0xDrL39MNnqxbHBbUUcjZIhTgb2g==",
+      "requires": {
+        "fn.name": "1.x.x"
+      }
+    },
     "optionator": {
       "version": "0.9.1",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
@@ -4118,6 +4368,11 @@
       "integrity": "sha512-9fbDAXSBcc6Bs1mZrDYb3XKzDLm4EXXL9sC1LqKP5rZkT6KRr/rf9amVUcODVXgguK/isJz0d0hP72WeaKWsvA==",
       "dev": true
     },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+    },
     "progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -4382,6 +4637,17 @@
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
       "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
     },
+    "safe-json-stringify": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/safe-json-stringify/-/safe-json-stringify-1.2.0.tgz",
+      "integrity": "sha512-gH8eh2nZudPQO6TytOvbxnuhYBOvDBBLW52tz5q6X58lJcd/tkmqFR+5Z9adS8aJtURSXWThWy/xJtJwixErvg==",
+      "optional": true
+    },
+    "safe-stable-stringify": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/safe-stable-stringify/-/safe-stable-stringify-1.1.1.tgz",
+      "integrity": "sha512-ERq4hUjKDbJfE4+XtZLFPCDi8Vb1JqaxAPTxWFLBx8XcAlf9Bda/ZJdVezs/NAfsMQScyIlUMx+Yeu7P7rx5jw=="
+    },
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@@ -4556,6 +4822,14 @@
       "integrity": "sha512-KWcOiKeQj6ZyXx7zq4YxSMgHRlod4czeBQZrPb8OKcohcqAXShm7E20kEMle9WBt26hFcAf0qLOcp5zmY7kOqQ==",
       "dev": true
     },
+    "simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "requires": {
+        "is-arrayish": "^0.3.1"
+      }
+    },
     "slash": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-2.0.0.tgz",
@@ -4599,6 +4873,11 @@
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
     },
+    "stack-trace": {
+      "version": "0.0.10",
+      "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.10.tgz",
+      "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA="
+    },
     "statuses": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
@@ -4690,6 +4969,11 @@
         "has-flag": "^3.0.0"
       }
     },
+    "text-hex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/text-hex/-/text-hex-1.0.0.tgz",
+      "integrity": "sha512-uuVGNWzgJ4yhRaNSiubPY7OjISw4sw4E5Uv0wbjp+OzcbmVU/rsT8ujgcXJhn9ypzsgr5vlzpPqP+MBBKcGvbg=="
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -4741,6 +5025,11 @@
         "nopt": "~1.0.10"
       }
     },
+    "triple-beam": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.3.0.tgz",
+      "integrity": "sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw=="
+    },
     "tslib": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
@@ -5052,6 +5341,55 @@
         "string-width": "^4.0.0"
       }
     },
+    "winston": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/winston/-/winston-3.3.3.tgz",
+      "integrity": "sha512-oEXTISQnC8VlSAKf1KYSSd7J6IWuRPQqDdo8eoRNaYKLvwSb5+79Z3Yi1lrl6KDpU6/VWaxpakDAtb1oQ4n9aw==",
+      "requires": {
+        "@dabh/diagnostics": "^2.0.2",
+        "async": "^3.1.0",
+        "is-stream": "^2.0.0",
+        "logform": "^2.2.0",
+        "one-time": "^1.0.0",
+        "readable-stream": "^3.4.0",
+        "stack-trace": "0.0.x",
+        "triple-beam": "^1.3.0",
+        "winston-transport": "^4.4.0"
+      }
+    },
+    "winston-transport": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.4.0.tgz",
+      "integrity": "sha512-Lc7/p3GtqtqPBYYtS6KCN3c77/2QCev51DvcJKbkFPQNoj1sinkGwLGFDxkXY9J6p9+EPnYs+D90uwbnaiURTw==",
+      "requires": {
+        "readable-stream": "^2.3.7",
+        "triple-beam": "^1.2.0"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "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": "~5.1.0"
+          }
+        }
+      }
+    },
     "wkx": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/wkx/-/wkx-0.5.0.tgz",
diff --git a/package.json b/package.json
index b4660f5..7c572a8 100644
--- a/package.json
+++ b/package.json
@@ -13,17 +13,20 @@
   "dependencies": {
     "@types/event-stream": "^3.3.34",
     "@types/node": "^16.10.1",
+    "bunyan": "^1.8.15",
     "csvtojson": "^2.0.10",
     "dotenv": "^10.0.0",
     "event-stream": "^4.0.1",
     "express": "^4.17.1",
     "express-joi-validation": "^5.0.0",
     "joi": "^17.4.2",
+    "morgan": "^1.10.0",
     "pg": "^8.7.1",
     "pg-hstore": "^2.3.4",
     "sequelize": "^6.9.0",
     "tslint": "^6.1.3",
-    "typescript": "^4.4.3"
+    "typescript": "^4.4.3",
+    "winston": "^3.3.3"
   },
   "devDependencies": {
     "@babel/cli": "^7.15.7",
@@ -31,7 +34,9 @@
     "@babel/node": "^7.15.4",
     "@babel/preset-env": "^7.15.6",
     "@babel/preset-typescript": "^7.15.0",
+    "@types/bunyan": "^1.8.8",
     "@types/express": "^4.17.13",
+    "@types/morgan": "^1.9.3",
     "@typescript-eslint/eslint-plugin": "^5.1.0",
     "@typescript-eslint/parser": "^5.1.0",
     "babel-eslint": "^10.1.0",
diff --git a/src/module-3/controllers/groups.ts b/src/module-3/controllers/groups.ts
index 29ce3e8..a8e8ea9 100644
--- a/src/module-3/controllers/groups.ts
+++ b/src/module-3/controllers/groups.ts
@@ -1,5 +1,6 @@
 import express from "express";
 import { createValidator } from "express-joi-validation";
+import { log, logger } from "../loggers";
 import * as GroupsService from "../services/groups";
 import { Errors, GroupModel } from "../types";
 import { isNull } from "./utils";
@@ -10,25 +11,28 @@ const router = express.Router();
 
 /* Get all groups */
 
-router.get("/", async (req, res) => {
+router.get("/", log(GroupsService.findAll), async (req, res) => {
   try {
     const groups = await GroupsService.findAll();
     res.status(200).send(groups);
   } catch (e) {
+    logger.setError(e.message);
     res.status(500).send(e.message);
   }
 });
 
 /* Find group by id */
 
-router.get("/:id", async (req, res) => {
+router.get("/:id", log(GroupsService.find), async (req, res) => {
   try {
     const id = req.params.id;
     const group = await GroupsService.find(id);
     if (group) {
       return res.status(200).send(group);
     }
-    res.status(404).send("Group not found");
+    const err = "Group not found";
+    logger.setError(err);
+    res.status(404).send(err);
   } catch (e) {
     res.status(500).send(e.message);
   }
@@ -36,27 +40,35 @@ router.get("/:id", async (req, res) => {
 
 /* Create new group */
 
-router.post("/", validator.body(groupValidationSchema), async (req, res) => {
-  try {
-    const body: GroupModel = req.body;
-    const isSuccess = await GroupsService.create(body);
-    if (!isSuccess) {
-      return res.status(400).send("Group with this name is already exists");
+router.post(
+  "/",
+  [log(GroupsService.create), validator.body(groupValidationSchema)],
+  async (req, res) => {
+    try {
+      const body: GroupModel = req.body;
+      const isSuccess = await GroupsService.create(body);
+      if (!isSuccess) {
+        const err = "Group with this name is already exists";
+        logger.setError(err);
+        return res.status(400).send(err);
+      }
+      res.redirect("/api/groups");
+    } catch (e) {
+      res.status(500).send(e.message);
     }
-    res.redirect("/api/groups");
-  } catch (e) {
-    res.status(500).send(e.message);
   }
-});
+);
 
 /* Delete group */
 
-router.delete("/:id", async (req, res) => {
+router.delete("/:id", log(GroupsService.remove), async (req, res) => {
   try {
     const id = req.params.id;
     const isSuccess = await GroupsService.remove(id);
     if (isNull(isSuccess)) {
-      return res.status(404).send("Something wrong");
+      const err = "Something wrong";
+      logger.setError(err);
+      return res.status(404).send(err);
     }
     res.redirect("/api/groups");
   } catch (e) {
@@ -66,17 +78,21 @@ router.delete("/:id", async (req, res) => {
 
 /* Update group */
 
-router.put("/:id", validator.body(groupValidationSchema), async (req, res) => {
-  try {
-    const id = req.params.id;
-    const status = await GroupsService.update(id, req.body);
-    if ((status as Errors).type === "error") {
-      return res.status(404).send((status as Errors).message);
+router.put(
+  "/:id",
+  [log(GroupsService.update), validator.body(groupValidationSchema)],
+  async ({ params: { id }, body }, res) => {
+    try {
+      const status = await GroupsService.update(id, body);
+      if ((status as Errors).type === "error") {
+        logger.setError(status);
+        return res.status(404).send((status as Errors).message);
+      }
+      res.redirect("/api/groups");
+    } catch (e) {
+      res.status(500).send(e.message);
     }
-    res.redirect("/api/groups");
-  } catch (e) {
-    res.status(500).send(e.message);
   }
-});
+);
 
 export default router;
diff --git a/src/module-3/controllers/user-groups.ts b/src/module-3/controllers/user-groups.ts
index e83b280..67ca29b 100644
--- a/src/module-3/controllers/user-groups.ts
+++ b/src/module-3/controllers/user-groups.ts
@@ -1,5 +1,6 @@
 import express from "express";
 import { createValidator } from "express-joi-validation";
+import { log, logger } from "../loggers";
 import { AddUsersToGroupModel } from "../services/types";
 import * as UserGroupsService from "../services/user-groups";
 import userGroupValidationSchema from "./validation/user-groups";
@@ -9,11 +10,12 @@ const router = express.Router();
 
 /* Get user-groups list */
 
-router.get("/", async (req, res) => {
+router.get("/", log(UserGroupsService.findAll), async (req, res) => {
   try {
     const userGroups = await UserGroupsService.findAll();
     res.status(200).send(userGroups);
   } catch (e) {
+    logger.setError(e);
     res.status(500).send(e.message);
   }
 });
@@ -22,13 +24,17 @@ router.get("/", async (req, res) => {
 
 router.post(
   "/",
-  validator.body(userGroupValidationSchema),
+  [
+    log(UserGroupsService.addUsersToGroup),
+    validator.body(userGroupValidationSchema)
+  ],
   async (req, res) => {
     try {
-      const body: AddUsersToGroupModel = req.body;
-      await UserGroupsService.addUsersToGroup(body.groupId, body.userIds);
+      const { groupId, userIds }: AddUsersToGroupModel = req.body;
+      await UserGroupsService.addUsersToGroup(groupId, userIds);
       res.redirect("/api/user-groups");
     } catch (e) {
+      logger.setError(e);
       res.status(500).send(e.message);
     }
   }
diff --git a/src/module-3/controllers/users.ts b/src/module-3/controllers/users.ts
index f9b8b9c..459d94b 100644
--- a/src/module-3/controllers/users.ts
+++ b/src/module-3/controllers/users.ts
@@ -1,5 +1,6 @@
 import express from "express";
 import { createValidator } from "express-joi-validation";
+import { log, logger } from "../loggers";
 import * as UsersService from "../services/users";
 import { UserModel } from "../types";
 import { isNull } from "./utils";
@@ -10,28 +11,35 @@ const router = express.Router();
 
 /* Get users list */
 
-router.get("/", async (req, res) => {
-  try {
-    const users = await UsersService.getAutoSuggestUsers(
-      req.body.loginSubstring,
-      req.body.limit
-    );
-    res.status(200).send(users);
-  } catch (e) {
-    res.status(500).send(e.message);
+router.get(
+  "/",
+  log(UsersService.getAutoSuggestUsers),
+  async ({ body }, res) => {
+    try {
+      const users = await UsersService.getAutoSuggestUsers(
+        body.loginSubstring,
+        body.limit
+      );
+      res.status(200).send(users);
+    } catch (e) {
+      logger.setError(e);
+      res.status(500).send(e.message);
+    }
   }
-});
+);
 
 /* Find user by id */
 
-router.get("/:id", async (req, res) => {
+router.get("/:id", log(UsersService.find), async (req, res) => {
   try {
     const id = req.params.id;
     const user = await UsersService.find(id);
     if (user) {
       return res.status(200).send(user);
     }
-    res.status(404).send("User not found");
+    const err = "User not found";
+    logger.setError(err);
+    res.status(404).send(err);
   } catch (e) {
     res.status(500).send(e.message);
   }
@@ -39,27 +47,35 @@ router.get("/:id", async (req, res) => {
 
 /* Create user */
 
-router.post("/", validator.body(userValidationSchema), async (req, res) => {
-  try {
-    const body: UserModel = req.body;
-    const isSuccess = await UsersService.create(body);
-    if (!isSuccess) {
-      return res.status(400).send("User with this login is already exists");
+router.post(
+  "/",
+  [log(UsersService.create), validator.body(userValidationSchema)],
+  async (req, res) => {
+    try {
+      const body: UserModel = req.body;
+      const isSuccess = await UsersService.create(body);
+      if (!isSuccess) {
+        const err = "User with this login is already exists";
+        logger.setError(err);
+        return res.status(400).send(err);
+      }
+      res.redirect("/api/users");
+    } catch (e) {
+      res.status(500).send(e.message);
     }
-    res.redirect("/api/users");
-  } catch (e) {
-    res.status(500).send(e.message);
   }
-});
+);
 
 /* Delete user */
 
-router.delete("/:id", async (req, res) => {
+router.delete("/:id", log(UsersService.remove), async (req, res) => {
   try {
     const id = req.params.id;
     const isSuccess = await UsersService.remove(id);
     if (isNull(isSuccess)) {
-      return res.status(404).send("User with this id is not found");
+      const err = "User with this id is not found";
+      logger.setError(err);
+      return res.status(404).send(err);
     }
     res.redirect("/api/users");
   } catch (e) {
@@ -69,17 +85,23 @@ router.delete("/:id", async (req, res) => {
 
 /* Update user */
 
-router.put("/:id", validator.body(userValidationSchema), async (req, res) => {
-  try {
-    const id = req.params.id;
-    const isSuccess = await UsersService.update(id, req.body);
-    if (!isSuccess) {
-      return res.status(404).send("User with this id is not found");
+router.put(
+  "/:id",
+  [log(UsersService.update), validator.body(userValidationSchema)],
+  async (req, res) => {
+    try {
+      const id = req.params.id;
+      const isSuccess = await UsersService.update(id, req.body);
+      if (!isSuccess) {
+        const err = "User with this id is not found";
+        logger.setError(err);
+        return res.status(404).send(err);
+      }
+      res.redirect("/api/users");
+    } catch (e) {
+      res.status(500).send(e.message);
     }
-    res.redirect("/api/users");
-  } catch (e) {
-    res.status(500).send(e.message);
   }
-});
+);
 
 export default router;
diff --git a/src/module-3/index.ts b/src/module-3/index.ts
index c79e912..f769679 100644
--- a/src/module-3/index.ts
+++ b/src/module-3/index.ts
@@ -3,9 +3,18 @@ import groupsRouter from "./controllers/groups";
 import userGroupsRouter from "./controllers/user-groups";
 import usersRouter from "./controllers/users";
 import db from "./data-access";
+import {
+  errorLoggerMiddleware,
+  initHandlers,
+  mainLoggerMiddleware
+} from "./loggers";
 
 const app = express();
 
+initHandlers();
+
+app.use(errorLoggerMiddleware);
+
 app.listen(3000, () =>
   db
     .authenticate()
@@ -16,6 +25,7 @@ app.listen(3000, () =>
     )
     .then(() => app.use(express.json()))
     .then(() => {
+      app.use(mainLoggerMiddleware);
       app.use("/api/groups", groupsRouter);
       app.use("/api/users", usersRouter);
       app.use("/api/user-groups", userGroupsRouter);
diff --git a/src/module-3/loggers.ts b/src/module-3/loggers.ts
new file mode 100644
index 0000000..61d4b95
--- /dev/null
+++ b/src/module-3/loggers.ts
@@ -0,0 +1,88 @@
+import { NextFunction, Request, Response } from "express";
+import morgan from "morgan";
+import winston from "winston";
+
+export let logger: LoggerStore = null;
+
+export class LoggerStore {
+  private fnName = null;
+  private fnArgs = null;
+  private error = null;
+
+  getFnData() {
+    console.log("\n");
+    console.log("============================================");
+    console.log("\n");
+    console.log("Info of the executed function:");
+    console.log({
+      ...(this.fnName ? { fnName: this.fnName } : undefined),
+      ...(this.fnArgs ? { fnArgs: this.fnArgs } : undefined),
+      ...(this.error ? { error: this.error } : undefined)
+    });
+  }
+
+  setFnData(name: string, { body, params }: Request) {
+    this.fnName = name;
+    this.fnArgs = { ...body, ...params };
+  }
+
+  setError(message: any) {
+    this.error = message;
+  }
+}
+
+const winstonLogger = winston.createLogger({
+  transports: [
+    new winston.transports.Console({
+      level: "error",
+      handleExceptions: true
+    })
+  ],
+  format: winston.format.combine(
+    winston.format.timestamp({ format: "YYYY-MM-DD HH:mm:ss:ms" }),
+    winston.format.colorize({ all: true }),
+    winston.format.printf(
+      (info) => `${info.timestamp} ${info.level}: ${info.message}`
+    )
+  ),
+  exitOnError: false
+});
+
+export const errorLoggerMiddleware = morgan("tiny", {
+  stream: {
+    write: (message) => winstonLogger.error(message)
+  },
+  skip: (req, res) => res.statusCode !== 500
+});
+
+export const mainLoggerMiddleware = (
+  req: Request,
+  res: Response,
+  next: NextFunction
+) => {
+  req.once("close", () => {
+    logger.getFnData();
+  });
+  next();
+};
+
+export const initHandlers = () => {
+  logger = new LoggerStore();
+
+  process.on("uncaughtException", (err) => {
+    console.log("We found an uncaught exception.");
+    console.log(err.stack);
+  });
+
+  process.on("unhandledRejection", (error) => {
+    console.log("unhandledRejection", error);
+  });
+};
+
+export const log = (fn: (...params: any) => void) => {
+  return (req: Request, res: Response, next: NextFunction) => {
+    logger.setError(null);
+    logger.setFnData(fn.name, req);
+    next();
+  };
+};
diff --git a/src/module-3/services/groups.ts b/src/module-3/services/groups.ts
index 5dd1bdf..a4ed5f5 100644
--- a/src/module-3/services/groups.ts
+++ b/src/module-3/services/groups.ts
@@ -12,10 +12,11 @@ export const find = async (id: string) =>
     }
   });
 
-export const findAll = async () =>
-  Group.findAll({
+export const findAll = async () => {
+  return Group.findAll({
     raw: true
   });
+};
 
 export const create = async (model: GroupModel) => {
   const { name } = model;