diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a9240e9fc..f1fb2ff2c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,13 +22,62 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
-      - name: Backend Tests
+      - name: Backend Tests (with coverage)
         run: |
           rm package-lock.json
           npm install -g npm@latest
           npm install
           npm run build
-          npm run test:backend
+          npm run test:backend -- --coverage
+
+      - name: Upload backend coverage report
+        if: ${{ always() && hashFiles('coverage/**/coverage-summary.json') != '' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-coverage-${{ matrix.node-version }}
+          path: coverage
+          retention-days: 5
+
+      - name: Publish backend coverage summary
+        if: ${{ always() && matrix.node-version == '22.x' }}
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const path = require('path');
+            const globModule = require('glob');
+
+            const matches = globModule.sync('coverage/**/coverage-summary.json', {
+              cwd: process.cwd(),
+              ignore: ['**/node_modules/**'],
+            });
+
+            if (!matches.length) {
+              core.warning('Coverage summary not found (expected coverage/**/coverage-summary.json). Did Vitest run with --coverage and include the json-summary reporter?');
+              return;
+            }
+
+            const summaryPath = path.resolve(matches[0]);
+            const summary = JSON.parse(fs.readFileSync(summaryPath, 'utf8'));
+            const metrics = ['lines', 'statements', 'branches', 'functions']
+              .map((key) => ({
+                label: key.charAt(0).toUpperCase() + key.slice(1),
+                ...summary.total[key],
+              }));
+
+            core.summary
+              .addHeading('Backend coverage')
+              .addTable([
+                ['Metric', 'Covered', 'Total', 'Pct'],
+                ...metrics.map(({ label, covered, total, pct }) => [
+                  label,
+                  `${covered}`,
+                  `${total}`,
+                  `${pct}%`,
+                ]),
+              ])
+              .addRaw('Full HTML report is available in the uploaded `backend-coverage-${{ matrix.node-version }}` artifact.')
+              .write();
 
   api-test:
     name: API tests (node env, api-test)
diff --git a/.gitignore b/.gitignore
index c5df3843c..c2b1df4ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,4 +63,7 @@ AGENTS.md
 .roo
 
 # source maps
-*.map
\ No newline at end of file
+*.map
+
+
+coverage/
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 1b7d01def..3e184dcad 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -39,6 +39,8 @@
         "@types/uuid": "^10.0.0",
         "@typescript-eslint/eslint-plugin": "^8.46.1",
         "@typescript-eslint/parser": "^8.46.1",
+        "@vitest/coverage-v8": "^4.0.14",
+        "@vitest/ui": "^4.0.14",
         "chalk": "^4.1.0",
         "clean-css": "^5.3.2",
         "dotenv": "^16.4.5",
@@ -1272,6 +1274,16 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@bufbuild/protobuf": {
       "version": "2.10.1",
       "resolved": "https://registry.npmjs.org/@bufbuild/protobuf/-/protobuf-2.10.1.tgz",
@@ -6425,6 +6437,13 @@
         "node": ">=18"
       }
     },
+    "node_modules/@polka/url": {
+      "version": "1.0.0-next.29",
+      "resolved": "https://registry.npmjs.org/@polka/url/-/url-1.0.0-next.29.tgz",
+      "integrity": "sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@protobufjs/aspromise": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
@@ -8145,6 +8164,53 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/@vitest/coverage-v8": {
+      "version": "4.0.14",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-4.0.14.tgz",
+      "integrity": "sha512-EYHLqN/BY6b47qHH7gtMxAg++saoGmsjWmAq9MlXxAz4M0NcHh9iOyKhBZyU4yxZqOd8Xnqp80/5saeitz4Cng==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.2",
+        "@vitest/utils": "4.0.14",
+        "ast-v8-to-istanbul": "^0.3.8",
+        "istanbul-lib-coverage": "^3.2.2",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-lib-source-maps": "^5.0.6",
+        "istanbul-reports": "^3.2.0",
+        "magicast": "^0.5.1",
+        "obug": "^2.1.1",
+        "std-env": "^3.10.0",
+        "tinyrainbow": "^3.0.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@vitest/browser": "4.0.14",
+        "vitest": "4.0.14"
+      },
+      "peerDependenciesMeta": {
+        "@vitest/browser": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@vitest/coverage-v8/node_modules/istanbul-lib-source-maps": {
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/istanbul-lib-source-maps/-/istanbul-lib-source-maps-5.0.6.tgz",
+      "integrity": "sha512-yg2d+Em4KizZC5niWhQaIomgf5WlL4vOOjZ5xGCmF8SnPE/mDWWXgvRExdcpCgh9lLRRa1/fSYp2ymmbJ1pI+A==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.23",
+        "debug": "^4.1.1",
+        "istanbul-lib-coverage": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "4.0.14",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.0.14.tgz",
@@ -8252,6 +8318,36 @@
         "url": "https://opencollective.com/vitest"
       }
     },
+    "node_modules/@vitest/ui": {
+      "version": "4.0.14",
+      "resolved": "https://registry.npmjs.org/@vitest/ui/-/ui-4.0.14.tgz",
+      "integrity": "sha512-fvDz8o7SQpFLoSBo6Cudv+fE85/fPCkwTnLAN85M+Jv7k59w2mSIjT9Q5px7XwGrmYqqKBEYxh/09IBGd1E7AQ==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@vitest/utils": "4.0.14",
+        "fflate": "^0.8.2",
+        "flatted": "^3.3.3",
+        "pathe": "^2.0.3",
+        "sirv": "^3.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.0.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "vitest": "4.0.14"
+      }
+    },
+    "node_modules/@vitest/ui/node_modules/fflate": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.8.2.tgz",
+      "integrity": "sha512-cPJU47OaAoCbg0pBvzsgpTPhmhqI5eJjh/JIu8tPj5q+T7iLvW/JAYUqmE7KOB4R1ZyEhzBaIQpQpardBF5z8A==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@vitest/utils": {
       "version": "4.0.14",
       "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.0.14.tgz",
@@ -8928,6 +9024,25 @@
         "node": "*"
       }
     },
+    "node_modules/ast-v8-to-istanbul": {
+      "version": "0.3.8",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-0.3.8.tgz",
+      "integrity": "sha512-szgSZqUxI5T8mLKvS7WTjF9is+MVbOeLADU73IseOcrqhxr/VAvy6wfoVE39KnKzA7JRhjF5eUagNlHwvZPlKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.31",
+        "estree-walker": "^3.0.3",
+        "js-tokens": "^9.0.1"
+      }
+    },
+    "node_modules/ast-v8-to-istanbul/node_modules/js-tokens": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-9.0.1.tgz",
+      "integrity": "sha512-mxa9E9ITFOt0ban3j6L5MpjwegGz6lBQmM1IJkWeBZGcMxto50+eWdjC/52xDbS2vy0k7vIMK0Fe2wfL9OQSpQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/async": {
       "version": "3.2.6",
       "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
@@ -15052,6 +15167,18 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/magicast": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/magicast/-/magicast-0.5.1.tgz",
+      "integrity": "sha512-xrHS24IxaLrvuo613F719wvOIv9xPHFWQHuvGUBmPnCA/3MQxKI3b+r7n1jAoDHmsbC5bRhTZYR77invLAxVnw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/parser": "^7.28.5",
+        "@babel/types": "^7.28.5",
+        "source-map-js": "^1.2.1"
+      }
+    },
     "node_modules/make-dir": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.1.0.tgz",
@@ -15465,6 +15592,16 @@
         "node": ">=4"
       }
     },
+    "node_modules/mrmime": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/mrmime/-/mrmime-2.0.1.tgz",
+      "integrity": "sha512-Y3wQdFg2Va6etvQ5I82yUhGdsKrcYox6p7FfL1LbK2J4V01F9TGlepTIhnK24t7koZibmg82KGglhA1XK5IsLQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -18297,6 +18434,21 @@
         "node": ">=8"
       }
     },
+    "node_modules/sirv": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/sirv/-/sirv-3.0.2.tgz",
+      "integrity": "sha512-2wcC/oGxHis/BoHkkPwldgiPSYcpZK3JU28WoMVv55yHJgcZ8rlXvuG9iZggz+sU1d4bRgIGASwyWqjxu3FM0g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@polka/url": "^1.0.0-next.24",
+        "mrmime": "^2.0.0",
+        "totalist": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/slash": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-5.1.0.tgz",
@@ -19380,6 +19532,16 @@
         "url": "https://github.com/sponsors/Borewit"
       }
     },
+    "node_modules/totalist": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
+      "integrity": "sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/touch": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.1.tgz",
@@ -19899,6 +20061,7 @@
       "integrity": "sha512-d9B2J9Cm9dN9+6nxMnnNJKJCtcyKfnHj15N6YNJfaFHRLua/d3sRKU9RuKmO9mB0XdFtUizlxfz/VPbd3OxGhw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@vitest/expect": "4.0.14",
         "@vitest/mocker": "4.0.14",
diff --git a/package.json b/package.json
index dd5c2394b..7ffd60d78 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,8 @@
     "@types/uuid": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^8.46.1",
     "@typescript-eslint/parser": "^8.46.1",
+    "@vitest/coverage-v8": "^4.0.14",
+    "@vitest/ui": "^4.0.14",
     "chalk": "^4.1.0",
     "clean-css": "^5.3.2",
     "dotenv": "^16.4.5",
@@ -40,9 +42,10 @@
     "yaml": "^2.8.1"
   },
   "scripts": {
-    "test": "npx mocha src/phoenix/test && npx vitest run src/backend && node src/backend/tools/test.mjs",
+    "test": "npx mocha src/phoenix/test && npx vitest run --config=src/backend/vitest.config.ts && node src/backend/tools/test.mjs",
     "test:puterjs-api": "vitest run tests/puterJsApiTests",
-    "test:backend": "npm run build:ts; vitest run --config=src/backend/vitest.config.ts src/backend",
+    "test:backend": "npm run build:ts; vitest run --config=src/backend/vitest.config.ts",
+    "test:backend-coverage": "npm run build:ts; vitest run --config=src/backend/vitest.config.ts",
     "start=gui": "nodemon --exec \"node dev-server.js\" ",
     "start": "node ./tools/run-selfhosted.js",
     "prestart": "npm run build:ts",
@@ -92,4 +95,4 @@
   "engines": {
     "node": ">=20.19.5"
   }
-}
\ No newline at end of file
+}
diff --git a/src/backend/vitest.config.ts b/src/backend/vitest.config.ts
index c842952a6..5a14fc364 100644
--- a/src/backend/vitest.config.ts
+++ b/src/backend/vitest.config.ts
@@ -8,9 +8,18 @@ export default defineConfig(({ mode }) => ({
         environment: 'jsdom',
         setupFiles: [],
         coverage: {
-            reporter: ['text', 'json', 'html'],
-            exclude: [],
+            provider: 'v8',
+            reporter: ['text', 'json', 'json-summary', 'html', 'lcov'],
+            include: ['src/backend/**/*.js', 'src/backend/**/*.mjs', 'src/backend/**/*.ts', 'src/backend/**/*.ts'],
+            exclude: [
+                '**/types/**',
+                '**/constants/**',
+                '**/*.d.ts',
+                '**/dist/**',
+                '**/*.min.*',
+            ],
         },
         env: loadEnv(mode, '', 'PUTER_'),
+        include: ['src/backend/**/*.test.ts', 'src/backend/**/*.test.js']
     },
 }));