# Security

Ensuring robust security is a critical aspect of modern app development. Whether your app handles user data, connects to third-party services, or stores sensitive business information, integrating security best practices from day one reduces risk, protects your users, and builds trust.

#### Build with Security by Design

1. Define **data sensitivity levels** (e.g., personal data, financial records).
2. Follow the principle of **least privilege**: users and system components should only access what they absolutely need.

<figure><img src="https://125370873-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzdpN2Lz0hzXpnNScDzVt%2Fuploads%2Fpc7Iw2i0kO82MlJmmS72%2Fimage.png?alt=media&#x26;token=0ccd13b8-78be-4475-b039-6baa8f74e723" alt=""><figcaption></figcaption></figure>

#### Authentication & Authorization

1. Enforce fine-grained access control at all levels - UI, API, and database.
2. Assign roles (admin, editor, viewer, etc.) with scoped permissions to reduce exposure.

<figure><img src="https://125370873-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzdpN2Lz0hzXpnNScDzVt%2Fuploads%2FifiWTc5BVK78DI9y06wD%2Fimage.png?alt=media&#x26;token=6e5c0e23-343b-4373-9181-f04da3268715" alt=""><figcaption></figcaption></figure>

#### Secure API Communication

Use **authentication tokens** or **keys** for all API requests.&#x20;

<figure><img src="https://125370873-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzdpN2Lz0hzXpnNScDzVt%2Fuploads%2FtGLsPg4DjVBifWLDWtxx%2Fimage.png?alt=media&#x26;token=05ffcdd1-bd10-4f84-84b3-246de12e36b1" alt=""><figcaption></figcaption></figure>

#### Avoid Unverified Plugins or Scripts

Only install libraries and third-party plugins from trusted sources.

[react.dev](https://react.dev/)

[angular.dev](https://angular.dev/)

[vuejs.org](https://vuejs.org/)

[jquery.com](https://jquery.com/)

[nodejs.org](https://nodejs.org/en)

#### Secure User Data and Privacy

1. Only collect data that is absolutely necessary.
2. Avoid storing personal identifiers unless essential for the app's core functions.