Appears when: White screen after deployment
The deployment is serving a page, but the browser cannot boot or render the application. Capture the first console error, confirm the JavaScript and CSS assets load from the production base path, and test direct routes and production API configuration.
# Preserve the deployed revision and errorsRecord asset URLs, console output, and the first failed request.# Correct the proven boot boundaryFix the base path, environment value, route fallback, or first runtime assumption.# Add a visible fallbackRender an error boundary or configuration error instead of a white page.# Verify cold and direct loadsTest with cache disabled, a clean session, and direct navigation to key routes.Preserve the current working revision, change one proven boundary, and verify the published path in a clean session.
Reload without cache and record the earliest console exception and failed network request.
What the result tells you: A missing bundle, module error, or undefined environment value points directly to the boot failure.
Confirm scripts return JavaScript rather than a 404 page and use the correct production base URL.
What the result tells you: An HTML response for a module or a wrong base path prevents the client app from starting.
Reload a nested route and inspect the first API request from production.
What the result tells you: A route fallback or live API origin issue may appear only after deployment.
| Likely cause | What proves it | First safe action |
|---|---|---|
| Wrong production base path | A missing bundle, module error, or undefined environment value points directly to the boot failure. | Preserve the deployed revision and errors |
| Missing frontend environment value | An HTML response for a module or a wrong base path prevents the client app from starting. | Correct the proven boot boundary |
| SPA route fallback is absent | A route fallback or live API origin issue may appear only after deployment. | Add a visible fallback |
| Client exception after data fetch | A missing bundle, module error, or undefined environment value points directly to the boot failure. | Verify cold and direct loads |
The deployment is serving a page, but the browser cannot boot or render the application. Capture the first console error, confirm the JavaScript and CSS assets load from the production base path, and test direct routes and production API configuration.
Built asset URLs point somewhere the deployed host does not serve.
The bundle boots with undefined API or auth configuration.
Direct navigation returns a 404 instead of the application shell.
Freeze generated changes, restore the last known working version, reproduce one request, collect the browser and platform logs, and change one layer at a time.
Infrastructure can be healthy while the browser application fails during asset loading or runtime execution.
Yes, but verify it by testing without cache. Do not use cache clearing as a substitute for finding a broken asset contract.
Send the live URL, browser console, network failures, deployment revision, and exact route that becomes blank.
Free decision aid
Get a senior view of the constraint, the evidence you have, and the next decision that removes the most risk.
No email required for this decision aid. Dismiss once and this popup stays closed for the session.