diff --git a/frontend/.eslintignore b/frontend/.eslintignore
new file mode 100644
index 0000000..5827a85
--- /dev/null
+++ b/frontend/.eslintignore
@@ -0,0 +1,2 @@
+*.css
+*.scss
\ No newline at end of file
diff --git a/frontend/.eslintrc.json b/frontend/.eslintrc.json
index 441450d..84236db 100644
--- a/frontend/.eslintrc.json
+++ b/frontend/.eslintrc.json
@@ -53,6 +53,7 @@
         "@typescript-eslint/require-await": "off",
         "@typescript-eslint/no-unsafe-member-access": "off",
         "@typescript-eslint/no-unsafe-assignment": "off",
-        "@typescript-eslint/no-unsafe-call": "off"
+        "@typescript-eslint/no-unsafe-call": "off",
+        "@typescript-eslint/unbound-method": "off"
     }
 }
\ No newline at end of file
diff --git a/frontend/package.json b/frontend/package.json
index 5f50368..ae494bb 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -3,7 +3,8 @@
     "scripts": {
         "start": "parcel serve src/index.html",
         "build": "parcel build src/index.html",
-        "lint": "eslint ./src/** --ext .js,.jsx,.ts,.tsx",
+        "lint": "eslint ./src/** --ext .js,.jsx,.ts,.tsx && tsc --noEmit",
+        "lint-fix": "eslint ./src/** --ext .js,.jsx,.ts,.tsx --fix",
         "test": "jest"
     },
     "postcss": {
@@ -61,4 +62,4 @@
         "@types/react-router-dom": "^5.1.6",
         "@types/sass": "^1.16.0"
     }
-}
+}
\ No newline at end of file
diff --git a/frontend/src/Auth/AuthScreen.tsx b/frontend/src/Auth/AuthScreen.tsx
index 113c190..2d2c986 100644
--- a/frontend/src/Auth/AuthScreen.tsx
+++ b/frontend/src/Auth/AuthScreen.tsx
@@ -23,7 +23,7 @@ export class AuthScreenComponent extends React.PureComponent<IAuthScreenProps> {
     }
     public render() {
         const { location } = this.props.history;
-        const { from } = this.props.location.state || { from: "/" };
+        const { from } = (this.props.location.state as any) || { from: "/" };
         const { loggedIn } = this.props;
         return loggedIn ? (
             <Redirect to={from} />
diff --git a/frontend/src/Auth/Login.tsx b/frontend/src/Auth/Login.tsx
index 3992c77..6301384 100644
--- a/frontend/src/Auth/Login.tsx
+++ b/frontend/src/Auth/Login.tsx
@@ -10,7 +10,7 @@ import { IAppState } from "~redux/reducers";
 
 interface ILoginComponentProps extends RouteComponentProps {
     inProgress: boolean;
-    error: string;
+    error: string | null;
     spinner: boolean;
     login: (username: string, password: string) => void;
 }
diff --git a/frontend/src/Auth/Signup.tsx b/frontend/src/Auth/Signup.tsx
index b084ce2..45f28ec 100644
--- a/frontend/src/Auth/Signup.tsx
+++ b/frontend/src/Auth/Signup.tsx
@@ -10,7 +10,7 @@ import { IAppState } from "~redux/reducers";
 
 interface ISignupComponentProps extends RouteComponentProps {
     inProgress: boolean;
-    error: string;
+    error: string | null;
     spinner: boolean;
     signup: (username: string, password: string, email: string) => void;
 }
diff --git a/frontend/src/Photos/Photos.scss b/frontend/src/Photos/Photos.scss
index 96f54f0..9e7a8de 100644
--- a/frontend/src/Photos/Photos.scss
+++ b/frontend/src/Photos/Photos.scss
@@ -6,5 +6,6 @@
 }
 
 .bp3-dark {
-    #overview {}
-}
\ No newline at end of file
+    #overview {
+    }
+}
diff --git a/frontend/src/redux/reducers.ts b/frontend/src/redux/reducers.ts
index 35ea9b3..be3a9fe 100644
--- a/frontend/src/redux/reducers.ts
+++ b/frontend/src/redux/reducers.ts
@@ -27,10 +27,10 @@ const localSettingsPersistConfig = {
 };
 
 export const rootReducer = combineReducers({
-    auth: persistReducer<IAuthState>(authPersistConfig, authReducer),
+    auth: persistReducer<IAuthState>(authPersistConfig, authReducer as any),
     user: userReducer,
     localSettings: persistReducer(
         localSettingsPersistConfig,
-        localSettingsReducer,
+        localSettingsReducer as any,
     ),
 });
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
index 1c9d822..3cdbc7f 100644
--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@@ -16,6 +16,7 @@
         "allowSyntheticDefaultImports": true,
         "strictFunctionTypes": true,
         "strictNullChecks": true,
+        "skipLibCheck": true,
         "baseUrl": "./src",
         "paths": {
             "~*": [
diff --git a/package-lock.json b/package-lock.json
index 6647c4e..ab10df4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -381,6 +381,11 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.5.tgz",
       "integrity": "sha512-jVFzDV6NTbrLMxm4xDSIW/gKnk8rQLF9wAzLWIOg+5nU6ACrIMndeBdXci0FGtqJbP9tQvm6V39eshc96TO2wQ=="
     },
+    "@types/parse-json": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/parse-json/-/parse-json-4.0.0.tgz",
+      "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA=="
+    },
     "@types/prettier": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/@types/prettier/-/prettier-2.1.1.tgz",
@@ -1052,6 +1057,11 @@
       "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
       "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg=="
     },
+    "ci-info": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
+      "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ=="
+    },
     "clean-stack": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@@ -1315,6 +1325,11 @@
       "resolved": "https://registry.npmjs.org/common-tags/-/common-tags-1.8.0.tgz",
       "integrity": "sha512-6P6g0uetGpW/sdyUy/iQQCbFF0kWVMSIVSyYz7Zgjcgh8mgw8PQzDNZeyZ5DQ2gM7LBoZPHmnjz8rUthkBG5tw=="
     },
+    "compare-versions": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/compare-versions/-/compare-versions-3.6.0.tgz",
+      "integrity": "sha512-W6Af2Iw1z4CB7q4uU4hv646dW9GQuBM+YpC0UvUCWSD8w90SJjp+ujJuXaEMtAXBtSqGfMPuFOVn4/+FlaqfBA=="
+    },
     "component-emitter": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -1444,6 +1459,36 @@
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
+    "cosmiconfig": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
+      "requires": {
+        "@types/parse-json": "^4.0.0",
+        "import-fresh": "^3.2.1",
+        "parse-json": "^5.0.0",
+        "path-type": "^4.0.0",
+        "yaml": "^1.10.0"
+      },
+      "dependencies": {
+        "parse-json": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
+          "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "error-ex": "^1.3.1",
+            "json-parse-even-better-errors": "^2.3.0",
+            "lines-and-columns": "^1.1.6"
+          }
+        },
+        "path-type": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
+          "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw=="
+        }
+      }
+    },
     "cross-env": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.2.tgz",
@@ -2072,6 +2117,14 @@
         "locate-path": "^2.0.0"
       }
     },
+    "find-versions": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/find-versions/-/find-versions-3.2.0.tgz",
+      "integrity": "sha512-P8WRou2S+oe222TOCHitLy8zj+SIsVJh52VP4lvXkaFVnOFFdoWv1H1Jjvel1aI6NCFOAaeAVm8qrI0odiLcww==",
+      "requires": {
+        "semver-regex": "^2.0.0"
+      }
+    },
     "flat": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
@@ -2366,6 +2419,76 @@
       "resolved": "https://registry.npmjs.org/humanize-number/-/humanize-number-0.0.2.tgz",
       "integrity": "sha1-EcCvakcWQ2M1iFiASPF5lUFInBg="
     },
+    "husky": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.0.tgz",
+      "integrity": "sha512-tTMeLCLqSBqnflBZnlVDhpaIMucSGaYyX6855jM4AguGeWCeSzNdb1mfyWduTZ3pe3SJVvVWGL0jO1iKZVPfTA==",
+      "requires": {
+        "chalk": "^4.0.0",
+        "ci-info": "^2.0.0",
+        "compare-versions": "^3.6.0",
+        "cosmiconfig": "^7.0.0",
+        "find-versions": "^3.2.0",
+        "opencollective-postinstall": "^2.0.2",
+        "pkg-dir": "^4.2.0",
+        "please-upgrade-node": "^3.2.0",
+        "slash": "^3.0.0",
+        "which-pm-runs": "^1.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+          "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+          "requires": {
+            "locate-path": "^5.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ=="
+        },
+        "path-exists": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
+          "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w=="
+        },
+        "pkg-dir": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
+          "integrity": "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==",
+          "requires": {
+            "find-up": "^4.0.0"
+          }
+        }
+      }
+    },
     "iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -2635,6 +2758,11 @@
       "resolved": "https://registry.npmjs.org/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz",
       "integrity": "sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw=="
     },
+    "json-parse-even-better-errors": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz",
+      "integrity": "sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w=="
+    },
     "json-schema-traverse": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
@@ -2886,6 +3014,11 @@
         "type-check": "~0.4.0"
       }
     },
+    "lines-and-columns": {
+      "version": "1.1.6",
+      "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.1.6.tgz",
+      "integrity": "sha1-HADHQ7QzzQpOgHWPe2SldEDZ/wA="
+    },
     "load-json-file": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-2.0.0.tgz",
@@ -3581,6 +3714,11 @@
       "resolved": "https://registry.npmjs.org/only/-/only-0.0.2.tgz",
       "integrity": "sha1-Kv3oTQPlC5qO3EROMGEKcCle37Q="
     },
+    "opencollective-postinstall": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.3.tgz",
+      "integrity": "sha512-8AV/sCtuzUeTo8gQK5qDZzARrulB3egtLzFgteqB2tcT4Mw7B8Kt7JcDHmltjz6FOAHsvTevk70gZEbhM4ZS9Q=="
+    },
     "optionator": {
       "version": "0.9.1",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
@@ -3778,6 +3916,14 @@
         "find-up": "^2.1.0"
       }
     },
+    "please-upgrade-node": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/please-upgrade-node/-/please-upgrade-node-3.2.0.tgz",
+      "integrity": "sha512-gQR3WpIgNIKwBMVLkpMUeR3e1/E1y42bqDQZfql+kDeXd8COYfM8PQA4X6y7a8u9Ua9FHmsrrmirW2vHs45hWg==",
+      "requires": {
+        "semver-compare": "^1.0.0"
+      }
+    },
     "prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -4349,6 +4495,16 @@
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
       "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ=="
     },
+    "semver-compare": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
+      "integrity": "sha1-De4hahyUGrN+nvsXiPavxf9VN/w="
+    },
+    "semver-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/semver-regex/-/semver-regex-2.0.0.tgz",
+      "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw=="
+    },
     "serialize-javascript": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-4.0.0.tgz",
@@ -5041,6 +5197,11 @@
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
@@ -5150,6 +5311,11 @@
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
     },
+    "yaml": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg=="
+    },
     "yargonaut": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/yargonaut/-/yargonaut-1.1.4.tgz",
diff --git a/package.json b/package.json
index b596db8..d54cb6e 100644
--- a/package.json
+++ b/package.json
@@ -7,9 +7,16 @@
     "ts-node-dev": "ts-node-dev -r tsconfig-paths/register ./src/server.ts",
     "dev": "cross-env NODE_ENV=development concurrently npm:ts-node-dev npm:start-frontend -c 'blue,green'",
     "test": "cross-env NODE_ENV=test mocha --timeout 15000 -r ts-node/register -r tsconfig-paths/register 'src/tests/**/*.ts' ",
-    "lint": "eslint ./src/** --ext .js,.jsx,.ts,.tsx",
+    "test-frontend": "cd frontend && npm test",
+    "test-all": "npm test && npm run test-frontend",
+    "lint": "eslint ./src/** --ext .js,.jsx,.ts,.tsx && tsc --noEmit",
+    "lint-fix": "eslint ./src/** --ext .js,.jsx,.ts,.tsx --fix",
     "lint-frontend": "cd frontend && npm run lint",
-    "lint-all": "npm run lint && npm run lint-frontend"
+    "lint-frontend-fix": "cd frontend && npm run lint-fix",
+    "lint-all": "npm run lint && npm run lint-frontend",
+    "lint-all-fix": "npm run lint-fix && npm run lint-frontend-fix",
+    "prettier-check": "prettier src/** --check && prettier frontend/src/** --check",
+    "prettify": "prettier src/** --write && prettier frontend/src/** --write"
   },
   "license": "MIT",
   "dependencies": {
@@ -26,6 +33,7 @@
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-mocha": "^8.0.0",
     "eslint-plugin-prettier": "^3.1.4",
+    "husky": "^4.3.0",
     "jsonwebtoken": "^8.5.1",
     "koa": "^2.13.0",
     "koa-body": "^4.2.0",
@@ -63,5 +71,10 @@
     "@types/mocha": "^8.0.3",
     "@types/prettier": "^2.1.1",
     "@types/supertest": "^2.0.10"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "npm run lint-all && npm run prettier-check"
+    }
   }
-}
+}
\ No newline at end of file
diff --git a/src/tests/.eslintrc.json b/src/tests/.eslintrc.json
index 59d58e2..e9a88cc 100644
--- a/src/tests/.eslintrc.json
+++ b/src/tests/.eslintrc.json
@@ -1,8 +1,4 @@
 {
-    "plugins": [
-        "mocha"
-    ],
-    "extends": [
-        "plugin:mocha/recommended"
-    ]
-}
\ No newline at end of file
+    "plugins": ["mocha"],
+    "extends": ["plugin:mocha/recommended"]
+}
diff --git a/tsconfig.json b/tsconfig.json
index 16ecd64..2d7f07d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,6 +13,7 @@
         "noImplicitAny": true,
         "strictFunctionTypes": true,
         "strictNullChecks": true,
+        "skipLibCheck": true,
         "baseUrl": "./src",
         "paths": {
             "~*": [