diff --git a/packages/hooks/index.ts b/packages/hooks/index.ts
new file mode 100644
index 000000000..aefea5e39
--- /dev/null
+++ b/packages/hooks/index.ts
@@ -0,0 +1 @@
+export { useStorageToggle } from './src/useStorageToggle';
diff --git a/packages/hooks/package.json b/packages/hooks/package.json
new file mode 100644
index 000000000..169a8e6f8
--- /dev/null
+++ b/packages/hooks/package.json
@@ -0,0 +1,45 @@
+{
+  "name": "@navikt/ft-hooks",
+  "version": "1.0.0",
+  "license": "MIT",
+  "type": "module",
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "test": "vitest",
+    "test:watch": "vitest --watch=true",
+    "test:coverage": "vitest --coverage",
+    "tsc": "tsc --pretty",
+    "eslint": "eslint \"src/**/*.ts*\" --color",
+    "eslint:fix": "eslint --fix \"src/**/*.ts*\" --color",
+    "prettier": "prettier --write src",
+    "dev": "vite build --watch --mode development",
+    "build": "vite build",
+    "clean": "rm -rf ./dist ./node_modules"
+  },
+  "peerDependencies": {
+    "react": "18.3.1"
+  },
+  "devDependencies": {
+    "eslint": "9.13.0",
+    "typescript": "5.6.3",
+    "vite": "5.4.10",
+    "vitest": "2.1.3"
+  },
+  "publishConfig": {
+    "registry": "https://npm.pkg.github.com"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/navikt/ft-frontend-saksbehandling"
+  },
+  "exports": {
+    ".": {
+      "import": "./dist/index.es.js",
+      "types": "./dist/index.d.ts",
+      "require": "./dist/index.umd.js"
+    }
+  }
+}
diff --git a/packages/hooks/src/useStorageToggle.spec.tsx b/packages/hooks/src/useStorageToggle.spec.tsx
new file mode 100644
index 000000000..41f0fe351
--- /dev/null
+++ b/packages/hooks/src/useStorageToggle.spec.tsx
@@ -0,0 +1,54 @@
+import { renderHook } from '@testing-library/react';
+import { defaultStorageKey, useStorageToggle } from './useStorageToggle';
+import { expect } from 'vitest';
+
+describe('useStorageToggle', () => {
+  it('skal gi false for default oppførsel uten verdi i default storage', () => {
+    const { result } = renderHook(() => useStorageToggle());
+    expect(result.current).toBe(false);
+  });
+
+  it('skal gi true når default key er satt i default storage', () => {
+    localStorage.setItem(defaultStorageKey, 'true');
+    const { result } = renderHook(() => useStorageToggle());
+    expect(result.current).toBe(true);
+  });
+
+  describe.each([
+    ['localStorage', window.localStorage],
+    ['sessionStorage', window.sessionStorage],
+  ])('med %s', (name, storageArea) => {
+    beforeEach(() => {
+      storageArea.clear();
+    });
+
+    it(`skal gi false når default key ikke er satt i ${name}`, () => {
+      const { result } = renderHook(() => useStorageToggle({ storageArea }));
+      expect(result.current).toBe(false);
+    });
+
+    it(`skal gi true når default key er satt i ${name}`, () => {
+      storageArea.setItem(defaultStorageKey, 'true');
+      const { result } = renderHook(() => useStorageToggle({ storageArea }));
+      expect(result.current).toBe(true);
+    });
+
+    it(`skal gi false når default key er satt til false i ${name}`, () => {
+      storageArea.setItem(defaultStorageKey, 'false');
+      const { result } = renderHook(() => useStorageToggle({ storageArea }));
+      expect(result.current).toBe(false);
+    });
+
+    it(`skal gi false når default key er satt til noe annet enn true i ${name}`, () => {
+      storageArea.setItem(defaultStorageKey, 'hei');
+      const { result } = renderHook(() => useStorageToggle({ storageArea }));
+      expect(result.current).toBe(false);
+    });
+
+    it(`skal gi true når custom key er satt til true i ${name}`, () => {
+      storageArea.setItem('devmode', 'true');
+      const { result } = renderHook(() => useStorageToggle({ key: 'devmode', storageArea }));
+      expect(result.current).toBe(true);
+    });
+  });
+});
diff --git a/packages/hooks/src/useStorageToggle.tsx b/packages/hooks/src/useStorageToggle.tsx
new file mode 100644
index 000000000..e150b543e
--- /dev/null
+++ b/packages/hooks/src/useStorageToggle.tsx
@@ -0,0 +1,41 @@
+import { useEffect, useState } from 'react';
+
+interface Props {
+  key?: string;
+  storageArea?: Storage;
+}
+
+export const defaultStorageKey = 'storagetoggle';
+
+/**
+ * Egendefinert hook for å toggle funksjonalitet av og på  ved å sette boolske-flagg i browser-storage.
+ *
+ * @param {string} [key='storagetoggle'] - Nøkkelen som brukes til å lagre utviklingsmodus-flagget.
+ * @param {Storage} [storageArea=localStorage] - Storage-området som brukes til å lagre utviklingsmodus-flagget,
+ * dette vil være `localStorage` eller `sessionStorage`.
+ * @returns {boolean} - Returnerer `true` hvis utviklingsmodus er aktivert, ellers `false`.
+ *
+ * Denne hooken lytter etter endringer for den spesifiserte storage-nøkkelen og oppdaterer tilstanden deretter.
+ *
+ * Eksempel på bruk:
+ * ```jsx
+ * const isDevMode = useStorageToggle({ key: 'devmode' });
+ * if (isDevMode) {
+ *   // Utfør handlinger som er spesifikke for utviklingsmodus
+ * }
+ */
+export const useStorageToggle = ({ key = defaultStorageKey, storageArea = localStorage }: Props = {}): boolean => {
+  const [toggleState, setToggleState] = useState(storageArea.getItem(key) === 'true');
+
+  useEffect(() => {
+    const handleStorageEvent = (event: StorageEvent) => {
+      if (event.key === key) setToggleState(event.newValue === 'true');
+    };
+    window.addEventListener('storage', handleStorageEvent);
+    return () => {
+      window.removeEventListener('storage', handleStorageEvent);
+    };
+  }, []);
+
+  return toggleState;
+};
diff --git a/packages/hooks/tsconfig.json b/packages/hooks/tsconfig.json
new file mode 100644
index 000000000..1681dd7b0
--- /dev/null
+++ b/packages/hooks/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "include": ["./", "../../@types/externals.d.ts"],
+  "exclude": ["node_modules", "**.spec.ts", "dist"],
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "strict": true
+  }
+}
diff --git a/packages/hooks/vite.config.js b/packages/hooks/vite.config.js
new file mode 100644
index 000000000..4aff819de
--- /dev/null
+++ b/packages/hooks/vite.config.js
@@ -0,0 +1,17 @@
+import { defineConfig } from 'vitest/config';
+import { mergeConfig } from 'vite';
+import { peerDependencies } from './package.json';
+import commonConfig from '../../vite.config';
+
+const config = defineConfig({
+  build: {
+    lib: {
+      name: '@navikt/ft-hooks',
+    },
+    rollupOptions: {
+      external: Object.keys(peerDependencies),
+    },
+  },
+});
+
+export default mergeConfig(commonConfig, config);
diff --git a/yarn.lock b/yarn.lock
index 2664200c0..afc5bc130 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3533,6 +3533,19 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@navikt/ft-hooks@workspace:packages/hooks":
+  version: 0.0.0-use.local
+  resolution: "@navikt/ft-hooks@workspace:packages/hooks"
+  dependencies:
+    eslint: 9.13.0
+    typescript: 5.6.3
+    vite: 5.4.10
+    vitest: 2.1.3
+  peerDependencies:
+    react: 18.3.1
+  languageName: unknown
+  linkType: soft
+
 "@navikt/ft-kodeverk@^2.5.5, @navikt/ft-kodeverk@workspace:^, @navikt/ft-kodeverk@workspace:packages/kodeverk":
   version: 0.0.0-use.local
   resolution: "@navikt/ft-kodeverk@workspace:packages/kodeverk"