How to resolve Content Security Policy (CSP) errors

5 Apr 20251 minute to read

WThe integration of Syncfusion® Angular components into your application can sometimes encounter issues when implementing a strict Content Security Policy (CSP). Resolving these issues is Essential® to ensuring both the security of your application and the full functionality of the components.

Why CSP Matters

Content Security Policy is a security feature that helps prevent a variety of attacks, such as Cross-Site Scripting (XSS) and data injection attacks. CSP works by allowing you to define which dynamic resources are allowed to load. This can sometimes block resources that are Essential® for the functioning of third-party libraries, such as Syncfusion® components.

Image loading

One of the common challenges with enabling a strict CSP in your application is the loading of images, particularly with Syncfusion’s licensing banner. This banner leverages images in base64 format for its display, which is often disallowed under a stringent CSP due to security policies.

Resolution

To allow base64 images and resolve CSP-related issues, you can do the following:

  1. Adjust CSP Rules in Meta Tag: You need to update your CSP rules to permit images in base64 format. This can be achieved by adding the img-src data: directive to the CSP settings in your <meta> tags.

  2. Register License Key: Consider registering the Syncfusion® license key in your application to ensure compliance and additional support. You can learn more about the process here.