diff --git a/package-lock.json b/package-lock.json
index 975d275a862531e5645ba1854c1d75ec2e98a686..d0fc0c2e275cffca9611cb1fce03effad06f5a25 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,11 +8,14 @@
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-        "@nestjs/config": "^1.0.1",
-        "@nestjs/core": "^7.5.1",
+        "@nestjs/common": "^7.6.15",
+        "@nestjs/config": "^0.6.2",
+        "@nestjs/core": "^7.6.15",
         "@nestjs/platform-express": "^7.5.1",
         "@nestjs/swagger": "^4.7.12",
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+        "ajv-formats": "1.5.1",
+        "class-transformer": "^0.4.0",
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         "rimraf": "^3.0.2",
         "rxjs": "^6.6.3",
@@ -59,6 +62,28 @@
         "yarn": ">= 1.13.0"
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+    "node_modules/@angular-devkit/core/node_modules/ajv": {
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
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+    "node_modules/@angular-devkit/core/node_modules/json-schema-traverse": {
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+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
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@@ -839,6 +864,22 @@
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+    "node_modules/@eslint/eslintrc/node_modules/ajv": {
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
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@@ -848,6 +889,12 @@
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+    "node_modules/@eslint/eslintrc/node_modules/json-schema-traverse": {
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+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
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+      "dev": true
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@@ -1436,6 +1483,22 @@
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
     "node_modules/@nestjs/cli/node_modules/enhanced-resolve": {
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       "dev": true
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+    "node_modules/@nestjs/cli/node_modules/json-schema-traverse": {
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+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
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+      "dev": true
+    },
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+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/@nestjs/config/-/config-0.6.3.tgz",
+      "integrity": "sha512-JxvvUpmH0/WOrTB+zh8dEkxSUQXhB7V3d/qeQXyCnMiEFjaq89+fNFztpWjz4DlOfdS4/eYTzIEy9PH2uGnfzA==",
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+        "dotenv": "8.2.0",
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@@ -1642,9 +1711,9 @@
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-        "reflect-metadata": "^0.1.13",
-        "rxjs": "^6.0.0 || ^7.2.0"
+        "@nestjs/common": "^6.10.0 || ^7.0.0",
+        "reflect-metadata": "^0.1.12",
+        "rxjs": "^6.0.0"
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     "node_modules/@nestjs/core": {
@@ -1766,6 +1835,22 @@
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       }
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+    "node_modules/@nestjs/schematics/node_modules/ajv": {
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "dev": true,
+      "dependencies": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
     "node_modules/@nestjs/schematics/node_modules/chalk": {
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@@ -1782,6 +1867,12 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
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+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
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+      "dev": true
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@@ -2231,12 +2322,6 @@
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@@ -2409,167 +2494,6 @@
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-7.2.4.tgz",
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@@ -2668,6 +2591,14 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
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+      "resolved": "https://registry.npmjs.org/ajv-formats/-/ajv-formats-1.5.1.tgz",
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+        "json-schema-traverse": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
         }
       }
     },
@@ -15076,8 +14815,7 @@
     "fast-deep-equal": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
-      "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
-      "dev": true
+      "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="
     },
     "fast-diff": {
       "version": "1.2.0",
@@ -16643,10 +16381,9 @@
       "dev": true
     },
     "json-schema-traverse": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
-      "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
-      "dev": true
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+      "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug=="
     },
     "json-stable-stringify-without-jsonify": {
       "version": "1.0.1",
@@ -16707,12 +16444,6 @@
         "type-check": "~0.4.0"
       }
     },
-    "libphonenumber-js": {
-      "version": "1.9.34",
-      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.9.34.tgz",
-      "integrity": "sha512-gHTNU9xTtVgSp30IDX/57W4pETMXDIYXFfwEOJVXiYosiY7Hc7ogJwlBjOqlCcU04X0aA8DT57hdwUC1sJBJnA==",
-      "peer": true
-    },
     "lines-and-columns": {
       "version": "1.1.6",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.1.6.tgz",
@@ -17636,8 +17367,7 @@
     "punycode": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
-      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
-      "dev": true
+      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A=="
     },
     "qs": {
       "version": "6.7.0",
@@ -17797,8 +17527,7 @@
     "require-from-string": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
-      "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
-      "dev": true
+      "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw=="
     },
     "require-main-filename": {
       "version": "2.0.0",
@@ -18183,6 +17912,26 @@
         "@types/json-schema": "^7.0.4",
         "ajv": "^6.12.2",
         "ajv-keywords": "^3.4.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "json-schema-traverse": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
+        }
       }
     },
     "semver": {
@@ -18968,12 +18717,6 @@
           "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
           "dev": true
         },
-        "json-schema-traverse": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
-          "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
-          "dev": true
-        },
         "string-width": {
           "version": "4.2.3",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -19036,6 +18779,18 @@
         "terser": "^5.7.2"
       },
       "dependencies": {
+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
         "jest-worker": {
           "version": "27.2.4",
           "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-27.2.4.tgz",
@@ -19047,6 +18802,12 @@
             "supports-color": "^8.0.0"
           }
         },
+        "json-schema-traverse": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
+        },
         "p-limit": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
@@ -19500,7 +19261,6 @@
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
       "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
-      "dev": true,
       "requires": {
         "punycode": "^2.1.0"
       }
@@ -19559,12 +19319,6 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
-    "validator": {
-      "version": "13.6.0",
-      "resolved": "https://registry.npmjs.org/validator/-/validator-13.6.0.tgz",
-      "integrity": "sha512-gVgKbdbHgtxpRyR8K0O6oFZPhhB5tT1jeEHZR0Znr9Svg03U0+r9DXWMrnRAB+HtCStDQKlaIZm42tVsVjqtjg==",
-      "peer": true
-    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -19622,99 +19376,12 @@
       "integrity": "sha512-qBIvFLGiBpLjfwmYAaHPXsn+ho5xZnGvyGvsarywGNc8VyQJUMHJ8OBKGGrPER0okBeMDaan4mNBlgBROxuI8w==",
       "dev": true
     },
-    "webpack": {
-      "version": "5.55.1",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.55.1.tgz",
-      "integrity": "sha512-EYp9lwaOOAs+AA/KviNZ7bQiITHm4bXQvyTPewD2+f5YGjv6sfiClm40yeX5FgBMxh5bxcB6LryiFoP09B97Ug==",
-      "dev": true,
-      "peer": true,
-      "requires": {
-        "@types/eslint-scope": "^3.7.0",
-        "@types/estree": "^0.0.50",
-        "@webassemblyjs/ast": "1.11.1",
-        "@webassemblyjs/wasm-edit": "1.11.1",
-        "@webassemblyjs/wasm-parser": "1.11.1",
-        "acorn": "^8.4.1",
-        "acorn-import-assertions": "^1.7.6",
-        "browserslist": "^4.14.5",
-        "chrome-trace-event": "^1.0.2",
-        "enhanced-resolve": "^5.8.3",
-        "es-module-lexer": "^0.9.0",
-        "eslint-scope": "5.1.1",
-        "events": "^3.2.0",
-        "glob-to-regexp": "^0.4.1",
-        "graceful-fs": "^4.2.4",
-        "json-parse-better-errors": "^1.0.2",
-        "loader-runner": "^4.2.0",
-        "mime-types": "^2.1.27",
-        "neo-async": "^2.6.2",
-        "schema-utils": "^3.1.0",
-        "tapable": "^2.1.1",
-        "terser-webpack-plugin": "^5.1.3",
-        "watchpack": "^2.2.0",
-        "webpack-sources": "^3.2.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "8.5.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.5.0.tgz",
-          "integrity": "sha512-yXbYeFy+jUuYd3/CDcg2NkIYE991XYX/bje7LmjJigUciaeO1JR4XxXgCIV1/Zc/dRuFEyw1L0pbA+qynJkW5Q==",
-          "dev": true,
-          "peer": true
-        },
-        "acorn-import-assertions": {
-          "version": "1.7.6",
-          "resolved": "https://registry.npmjs.org/acorn-import-assertions/-/acorn-import-assertions-1.7.6.tgz",
-          "integrity": "sha512-FlVvVFA1TX6l3lp8VjDnYYq7R1nyW6x3svAt4nDgrWQ9SBaSh9CnbwgSUTasgfNfOG5HlM1ehugCvM+hjo56LA==",
-          "dev": true,
-          "peer": true,
-          "requires": {}
-        },
-        "enhanced-resolve": {
-          "version": "5.8.3",
-          "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.8.3.tgz",
-          "integrity": "sha512-EGAbGvH7j7Xt2nc0E7D99La1OiEs8LnyimkRgwExpUMScN6O+3x9tIWs7PLQZVNx4YD+00skHXPXi1yQHpAmZA==",
-          "dev": true,
-          "peer": true,
-          "requires": {
-            "graceful-fs": "^4.2.4",
-            "tapable": "^2.2.0"
-          }
-        },
-        "schema-utils": {
-          "version": "3.1.1",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.1.1.tgz",
-          "integrity": "sha512-Y5PQxS4ITlC+EahLuXaY86TXfR7Dc5lw294alXOq86JAHCihAIZfqv8nNCWvaEJvaC51uN9hbLGeV0cFBdH+Fw==",
-          "dev": true,
-          "peer": true,
-          "requires": {
-            "@types/json-schema": "^7.0.8",
-            "ajv": "^6.12.5",
-            "ajv-keywords": "^3.5.2"
-          }
-        },
-        "tapable": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.2.1.tgz",
-          "integrity": "sha512-GNzQvQTOIP6RyTfE2Qxb8ZVlNmw0n88vp1szwWRimP02mnTsx3Wtn5qRdqY9w2XduFNUgvOwhNnQsjwCp+kqaQ==",
-          "dev": true,
-          "peer": true
-        }
-      }
-    },
     "webpack-node-externals": {
       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-2.5.2.tgz",
       "integrity": "sha512-aHdl/y2N7PW2Sx7K+r3AxpJO+aDMcYzMQd60Qxefq3+EwhewSbTBqNumOsCE1JsCUNoyfGj5465N0sSf6hc/5w==",
       "dev": true
     },
-    "webpack-sources": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-3.2.1.tgz",
-      "integrity": "sha512-t6BMVLQ0AkjBOoRTZgqrWm7xbXMBzD+XDq2EZ96+vMfn3qKgsvdXZhbPZ4ElUOpdv4u+iiGe+w3+J75iy/bYGA==",
-      "dev": true,
-      "peer": true
-    },
     "whatwg-encoding": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
diff --git a/package.json b/package.json
index 22213e99230ce0e6fd092048e567509608a5a9f3..0ef9c8f2381205a8f2a3bb4d7a9151375e337950 100644
--- a/package.json
+++ b/package.json
@@ -21,11 +21,14 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
-    "@nestjs/common": "^7.5.1",
-    "@nestjs/config": "^1.0.1",
-    "@nestjs/core": "^7.5.1",
+    "@nestjs/common": "^7.6.15",
+    "@nestjs/config": "^0.6.2",
+    "@nestjs/core": "^7.6.15",
     "@nestjs/platform-express": "^7.5.1",
     "@nestjs/swagger": "^4.7.12",
+    "ajv": "^7.0.3",
+    "ajv-formats": "1.5.1",
+    "class-transformer": "^0.4.0",
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
     "rxjs": "^6.6.3",
diff --git a/src/app.dto.ts b/src/app.dto.ts
new file mode 100644
index 0000000000000000000000000000000000000000..622547505a316f5a17946a0992af395df70e2820
--- /dev/null
+++ b/src/app.dto.ts
@@ -0,0 +1,6 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class AddItemDto {
+    @ApiProperty({ description: 'Any value or object you want to add'})
+    data: any
+}
diff --git a/src/app.module.ts b/src/app.module.ts
index 56cea32fbcf3e16636ef89087235132c94bfaaed..80ce98897ad668a3ed6e07d5ffb3efb55d0e9160 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -1,13 +1,17 @@
 import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { getConfig } from './config';
+import { LifoModule } from './modules/lifo/lifo.module';
 
 @Module({
-    imports: [ConfigModule.forRoot({
-        isGlobal: true,
-        expandVariables: true,
-        load: [getConfig],
-    })],
+    imports: [
+        ConfigModule.forRoot({
+            isGlobal: true,
+            expandVariables: true,
+            load: [getConfig],
+        }),
+        LifoModule,
+    ],
     providers: [ConfigService],
 })
 export class AppModule {}
diff --git a/src/common/schemas/add-item-schema.json b/src/common/schemas/add-item-schema.json
new file mode 100644
index 0000000000000000000000000000000000000000..edcfcb057d2686cf3d42ffb6852bca5f60e53ed3
--- /dev/null
+++ b/src/common/schemas/add-item-schema.json
@@ -0,0 +1,12 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "https://lifo-ttl/schemas/add-item-schema.json",
+  "type": "object",
+  "properties": {
+    "data": {
+      "type": ["object", "boolean", "string", "number", "array", "null"]
+    }
+  },
+  "required": ["data"],
+  "additionalProperties": false
+}
\ No newline at end of file
diff --git a/src/common/schemas/index.ts b/src/common/schemas/index.ts
new file mode 100644
index 0000000000000000000000000000000000000000..147971a62e4e93b2d7277c34a86d57c66f5a029a
--- /dev/null
+++ b/src/common/schemas/index.ts
@@ -0,0 +1,3 @@
+import * as addItemSchema from './add-item-schema.json';
+
+export { addItemSchema }
\ No newline at end of file
diff --git a/src/common/validation/AjvValidationPipe.ts b/src/common/validation/AjvValidationPipe.ts
new file mode 100644
index 0000000000000000000000000000000000000000..7e39567f38b5c786aa2e522185b4556651c6c3dd
--- /dev/null
+++ b/src/common/validation/AjvValidationPipe.ts
@@ -0,0 +1,41 @@
+import Ajv, { JSONSchemaType, Schema, ValidateFunction } from 'ajv';
+import addFormats from 'ajv-formats';
+import { PipeTransform, Injectable, BadRequestException } from '@nestjs/common';
+import * as schemas from '../schemas';
+
+interface AJVConfigParam {
+    adapter: (value) => any;
+}
+
+const ajv = new Ajv({
+    allErrors: true,
+    schemas: [...Object.values(schemas)],
+});
+addFormats(ajv as any);
+
+@Injectable()
+export class AjvValidationPipe implements PipeTransform {
+    validationSchema: ValidateFunction;
+
+    constructor(private schema: Schema | JSONSchemaType<any>, private config?: AJVConfigParam) {
+        this.validationSchema = ajv.compile(schema);
+    }
+
+    async transform(value: object) {
+
+        if (this.config?.adapter) {
+            value = this.config.adapter(value);
+        }
+
+        const validate = this.validationSchema.schemaEnv.validate;
+
+        await validate(value);
+        const { errors } = this.validationSchema;
+
+        if (errors) {
+            throw new BadRequestException(errors);
+        }
+
+        return value;
+    }
+}
diff --git a/src/config/config.ts b/src/config/config.ts
index a0a1183607740d3cfadd2a3e6de848dd05bc5ab7..6b3394bc647dc2aceeee59ccd789f1a1223f4486 100644
--- a/src/config/config.ts
+++ b/src/config/config.ts
@@ -3,6 +3,9 @@ import { envSchema, appSchema } from './';
 
 const ajv = new Ajv({
     allErrors: true,
+    useDefaults: true,
+    allowUnionTypes: true,
+    coerceTypes: true,
 })
 
 export const getConfig = () => {
@@ -10,8 +13,7 @@ export const getConfig = () => {
     const config = { ...env };
 
     const validationSchema = ajv.compile(appSchema);
-    const valid = ajv.validate(appSchema, config);
-    if (!valid) {
+    if (!validationSchema.schemaEnv.validate(config)) {
         throw new Error(JSON.stringify(validationSchema.errors));
     }
 
@@ -20,8 +22,7 @@ export const getConfig = () => {
 
 export const initConfig = () => {
     const validationSchema = ajv.compile(envSchema);
-    const valid = ajv.validate(appSchema, process.env);
-    if (!valid) {
+    if (!validationSchema.schemaEnv.validate(process.env)) {
         throw new Error(JSON.stringify(validationSchema.errors));
     }
 }
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 12599c209c6a14d27b695372b93aa974f91b7484..e0c789c386ca3fc9b78b16c3a7de1053e619e9bc 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -28,7 +28,7 @@ async function bootstrap() {
         }
 
         const port = configService.get<string | number>('PORT');
-        console.log(port);
+
         await app.listen(port);
 
         if (apiDoc) {
diff --git a/src/modules/lifo/index.ts b/src/modules/lifo/index.ts
new file mode 100644
index 0000000000000000000000000000000000000000..df8fcbce0b544e09fd931aa4b5813a0c7389c3e2
--- /dev/null
+++ b/src/modules/lifo/index.ts
@@ -0,0 +1,3 @@
+export * from './lifo.controller';
+export * from './lifo.model';
+export * from './lifo.service';
diff --git a/src/modules/lifo/lifo.controller.ts b/src/modules/lifo/lifo.controller.ts
new file mode 100644
index 0000000000000000000000000000000000000000..4cee128c8a5fef1f8e6ed6b46b9cbd78619b0734
--- /dev/null
+++ b/src/modules/lifo/lifo.controller.ts
@@ -0,0 +1,36 @@
+import { Body, Controller, Post, Get } from '@nestjs/common';
+import {
+    ApiBadRequestResponse,
+    ApiCreatedResponse,
+    ApiOkResponse,
+    ApiOperation,
+    ApiTags,
+} from '@nestjs/swagger'
+import { AddItemDto } from '../../app.dto';
+import { LifoService } from './lifo.service';
+import { AjvValidationPipe } from '../../common/validation/AjvValidationPipe';
+import { addItemSchema } from '../../common/schemas';
+
+@ApiTags('ttl-lifo/lifo')
+@Controller('lifo')
+export class LifoController {
+    constructor(private readonly lifoService: LifoService) {}
+
+    @Post()
+    @ApiOperation({ summary: 'Add value to stack' })
+    @ApiCreatedResponse({
+        description: 'Value successfully added',
+    })
+    @ApiBadRequestResponse({ description: 'Request failed with status code 400' })
+    add(@Body(new AjvValidationPipe(addItemSchema)) dto: AddItemDto) {
+        return this.lifoService.add(dto);
+    }
+
+    @Get()
+    @ApiOperation({ summary: 'Return value from stack' })
+    @ApiOkResponse({ description: 'Return value from stack' })
+    get() {
+        return this.lifoService.pop();
+    }
+}
+
diff --git a/src/modules/lifo/lifo.interfaces.ts b/src/modules/lifo/lifo.interfaces.ts
new file mode 100644
index 0000000000000000000000000000000000000000..abed3dc42d676f62a431ae431e5756e57cf8dae9
--- /dev/null
+++ b/src/modules/lifo/lifo.interfaces.ts
@@ -0,0 +1,4 @@
+export interface StackInterface {
+    push(item: any);
+    pop();
+}
diff --git a/src/modules/lifo/lifo.model.ts b/src/modules/lifo/lifo.model.ts
new file mode 100644
index 0000000000000000000000000000000000000000..e2573c28942d8360acd44c3e38a7fbeadc34cad8
--- /dev/null
+++ b/src/modules/lifo/lifo.model.ts
@@ -0,0 +1,18 @@
+import { Injectable } from '@nestjs/common';
+import { StackInterface } from './lifo.interfaces';
+
+@Injectable()
+export class LifoModel implements StackInterface {
+    private store;
+    constructor() {
+        this.store = [];
+    }
+
+    push(item: any) {
+        this.store.push(item);
+    }
+
+    pop() {
+        return this.store.pop();
+    }
+}
\ No newline at end of file
diff --git a/src/modules/lifo/lifo.module.ts b/src/modules/lifo/lifo.module.ts
new file mode 100644
index 0000000000000000000000000000000000000000..fba2a1c9b68deb184d2db52c386c0bb6376c5a5f
--- /dev/null
+++ b/src/modules/lifo/lifo.module.ts
@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { LifoController } from './lifo.controller';
+import { LifoService } from './lifo.service';
+import { LifoModel } from './lifo.model';
+
+@Module({
+    providers: [LifoService, LifoModel],
+    controllers: [LifoController]
+})
+export class LifoModule {}
diff --git a/src/modules/lifo/lifo.service.ts b/src/modules/lifo/lifo.service.ts
new file mode 100644
index 0000000000000000000000000000000000000000..f7840d38d5c72c7a283a93cedfc17e19aa03e703
--- /dev/null
+++ b/src/modules/lifo/lifo.service.ts
@@ -0,0 +1,16 @@
+import { Injectable } from '@nestjs/common';
+import { LifoModel } from './lifo.model';
+import { AddItemDto } from '../../app.dto';
+
+@Injectable()
+export class LifoService {
+    constructor(private readonly store: LifoModel) {}
+
+    add(item: AddItemDto) {
+        return this.store.push(item.data);
+    }
+
+    pop() {
+        return this.store.pop();
+    }
+}
\ No newline at end of file