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Fix SharePoint Web Part Works Locally but Not in Online Workbench

Steven Parker Oct 23, 2026 868 views

Question details

A custom SharePoint Framework (SPFx) web part functions correctly in the local development workbench but fails to load or work properly when added to a live SharePoint online site.

How to Fix SharePoint Web Part Working Locally but Not in Online Workbench

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Deploying and testing a newly developed custom SPFx web part in a live SharePoint Online environment.
Observed behavior: The web part loads successfully during local testing but encounters errors, fails to render, or remains invisible in the SharePoint online workbench.

Before you start

Ensure you have SharePoint administrator privileges and access to your tenant's App Catalog to verify package deployments and approve necessary API permissions.

Solution 1Recommended

Verify App Catalog Deployment and API Permissions

Check that the SPFx package was successfully deployed to the tenant App Catalog and that all required API permissions are approved.

Web parts often rely on specific backend APIs that require explicit admin consent. Even if the package is deployed successfully, failing to approve these permissions in the SharePoint Admin Center will cause the web part to fail in the online workbench.

Check the SharePoint App Catalog

Navigate to your SharePoint Admin Center, go to 'More features', and open the 'Apps' section. Click 'App Catalog' and ensure your .sppkg file is uploaded, deployed, and shows no errors in the 'App Package Error Message' column.

Approve Pending API Permissions

In the SharePoint Admin Center, expand the 'Advanced' menu on the left sidebar and click 'API access'. Review the 'Pending requests' section and approve any API permissions requested by your custom web part.

Rebuild for Production

If the package was built using development settings, it might fail online. Open your local terminal and run 'gulp clean', followed by 'gulp bundle --ship' and 'gulp package-solution --ship' to create a clean production build before re-uploading.

Browser Cache: After updating the package in the App Catalog and approving permissions, clear your browser cache or use an incognito window to load the online workbench to ensure you are seeing the latest version.

Solution 2

Consult the SharePoint Development Community

Reach out to Microsoft specialists for complex code or configuration issues that cannot be resolved through standard deployment checks.

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Frequently Asked Questions

Can I test my SPFx web part against live SharePoint data without deploying it?

Yes. You can run 'gulp serve' locally and then navigate to 'https://[your-tenant].sharepoint.com/_layouts/15/workbench.aspx' in your browser. This online workbench connects to live SharePoint data while serving the web part assets directly from your local development environment.

Why does my web part show a 'manifest not found' error online?

This usually happens if the CDN configuration is incorrect, or if the assets were not properly packaged and deployed. Ensure you have run the build commands with the '--ship' flag ('gulp bundle --ship' and 'gulp package-solution --ship') so the assets are bundled within the package or correctly referenced to your CDN.

How long does it take for API permission approvals to take effect?

Once you approve API permissions in the SharePoint Admin Center, it can take up to 15-30 minutes for the changes to fully propagate across the tenant. If your web part still fails immediately after approval, wait a short while and refresh.

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