diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..699ed73
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,3 @@
+{
+  "recommendations": ["biomejs.biome"]
+}
diff --git a/biome.json b/biome.json
new file mode 100644
index 0000000..3676aab
--- /dev/null
+++ b/biome.json
@@ -0,0 +1,34 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.9.3/schema.json",
+  "vcs": {
+    "enabled": false,
+    "clientKind": "git",
+    "useIgnoreFile": false
+  },
+  "files": {
+    "ignoreUnknown": false,
+    "ignore": []
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space"
+  },
+  "organizeImports": {
+    "enabled": true
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "style": {
+        "noNonNullAssertion": "off"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double",
+      "trailingCommas": "none"
+    }
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 67d2b83..8cf6e41 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,12 +12,177 @@
         "type-fest": "4.5.0"
       },
       "devDependencies": {
+        "@biomejs/biome": "1.9.3",
         "@types/node": "20.8.4",
         "tsup": "7.2.0",
         "tsx": "3.13.0",
         "typescript": "5.2.2"
       }
     },
+    "node_modules/@biomejs/biome": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-1.9.3.tgz",
+      "integrity": "sha512-POjAPz0APAmX33WOQFGQrwLvlu7WLV4CFJMlB12b6ZSg+2q6fYu9kZwLCOA+x83zXfcPd1RpuWOKJW0GbBwLIQ==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT OR Apache-2.0",
+      "bin": {
+        "biome": "bin/biome"
+      },
+      "engines": {
+        "node": ">=14.21.3"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/biome"
+      },
+      "optionalDependencies": {
+        "@biomejs/cli-darwin-arm64": "1.9.3",
+        "@biomejs/cli-darwin-x64": "1.9.3",
+        "@biomejs/cli-linux-arm64": "1.9.3",
+        "@biomejs/cli-linux-arm64-musl": "1.9.3",
+        "@biomejs/cli-linux-x64": "1.9.3",
+        "@biomejs/cli-linux-x64-musl": "1.9.3",
+        "@biomejs/cli-win32-arm64": "1.9.3",
+        "@biomejs/cli-win32-x64": "1.9.3"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-arm64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-1.9.3.tgz",
+      "integrity": "sha512-QZzD2XrjJDUyIZK+aR2i5DDxCJfdwiYbUKu9GzkCUJpL78uSelAHAPy7m0GuPMVtF/Uo+OKv97W3P9nuWZangQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-x64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-x64/-/cli-darwin-x64-1.9.3.tgz",
+      "integrity": "sha512-vSCoIBJE0BN3SWDFuAY/tRavpUtNoqiceJ5PrU3xDfsLcm/U6N93JSM0M9OAiC/X7mPPfejtr6Yc9vSgWlEgVw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-arm64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-arm64/-/cli-linux-arm64-1.9.3.tgz",
+      "integrity": "sha512-vJkAimD2+sVviNTbaWOGqEBy31cW0ZB52KtpVIbkuma7PlfII3tsLhFa+cwbRAcRBkobBBhqZ06hXoZAN8NODQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-arm64-musl": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-arm64-musl/-/cli-linux-arm64-musl-1.9.3.tgz",
+      "integrity": "sha512-VBzyhaqqqwP3bAkkBrhVq50i3Uj9+RWuj+pYmXrMDgjS5+SKYGE56BwNw4l8hR3SmYbLSbEo15GcV043CDSk+Q==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-x64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-x64/-/cli-linux-x64-1.9.3.tgz",
+      "integrity": "sha512-x220V4c+romd26Mu1ptU+EudMXVS4xmzKxPVb9mgnfYlN4Yx9vD5NZraSx/onJnd3Gh/y8iPUdU5CDZJKg9COA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-x64-musl": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-x64-musl/-/cli-linux-x64-musl-1.9.3.tgz",
+      "integrity": "sha512-TJmnOG2+NOGM72mlczEsNki9UT+XAsMFAOo8J0me/N47EJ/vkLXxf481evfHLlxMejTY6IN8SdRSiPVLv6AHlA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-arm64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-arm64/-/cli-win32-arm64-1.9.3.tgz",
+      "integrity": "sha512-lg/yZis2HdQGsycUvHWSzo9kOvnGgvtrYRgoCEwPBwwAL8/6crOp3+f47tPwI/LI1dZrhSji7PNsGKGHbwyAhw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-x64": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-x64/-/cli-win32-x64-1.9.3.tgz",
+      "integrity": "sha512-cQMy2zanBkVLpmmxXdK6YePzmZx0s5Z7KEnwmrW54rcXK3myCNbQa09SwGZ8i/8sLw0H9F3X7K4rxVNGU8/D4Q==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
     "node_modules/@esbuild/android-arm": {
       "version": "0.18.20",
       "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.18.20.tgz",
diff --git a/package.json b/package.json
index ea5d093..03d1bcf 100644
--- a/package.json
+++ b/package.json
@@ -6,13 +6,7 @@
   "types": "./dist/index.d.ts",
   "exports": "./dist/index.js",
   "sideEffects": false,
-  "files": [
-    "dist",
-    "src",
-    "package.json",
-    "LICENSE.txt",
-    "README.md"
-  ],
+  "files": ["dist", "src", "package.json", "LICENSE.txt", "README.md"],
   "license": "MIT",
   "description": "A JMAP client library for Node.js and the browser.",
   "repository": {
@@ -25,9 +19,11 @@
   },
   "scripts": {
     "preversion": "tsup",
-    "build": "tsup"
+    "build": "tsup",
+    "check": "biome check --write ."
   },
   "devDependencies": {
+    "@biomejs/biome": "1.9.3",
     "@types/node": "20.8.4",
     "tsup": "7.2.0",
     "tsx": "3.13.0",