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API Designer Troubleshooting

This page describes common issues that sometimes occur when working in API Designer, along with their causes and recommended troubleshooting steps.

Preparing to publish status persists

While working in API Designer, these issues sometimes occur:

  • The Preparing to publish dialog doesn’t complete when publishing to Exchange.

  • API specifications don’t display validation errors, warnings, or suggestions.

  • The API Console doesn’t render or remains blank.

  • The browser console shows a NetworkError related to loading the anypoint-als.js library.

These issues typically occur when a required API Designer component fails to load due to network restrictions.

API Designer relies on API Language Services, which is a background service, to enable validation and rendering. In some environments, corporate firewalls, VPNs, or proxies can block or interrupt the download of this component, preventing the editor from functioning correctly.

Verification and diagnostics

To verify whether your network is correctly delivering the required resources:

  • Compare file delivery via cURL Run this command and confirm the response is successful and that the file size is approximately 1.5 MB:

curl -I https://cdn.anypoint.mulesoft.com/artifacts/api-designer-ui/app/static/js/anypoint-als.01bd90ee2cb9622ee518fcb3e30c444e.js

Troubleshooting

To identify and resolve the issue:

  • Test outside restricted networks: Try accessing API Designer without a corporate VPN or proxy.

  • Use a clean browser session: Open a private or incognito window and disable browser extensions.

  • Try a different browser: Switch to another browser, such as Chrome, Edge, Firefox, or Safari.

  • Check local security software: Ensure antivirus or endpoint protection tools aren’t blocking background scripts or service workers.