Fix: Lovable Deployment Fails or Shows Errors
Quick Answer
How do I fix "Deployment failed" in Lovable?
Check the build logs for specific error messages. Most failures are caused by missing environment variables or TypeScript errors that were ignored in development mode.
Fix signals
- What this answers
- How to fix deployment failed in Lovable.
- Fastest move
- Read the build logs
- Use this page if
- Deployment shows 'Build failed'
If this keeps happening
Open the next decision if the same bug class keeps coming back
Use these when the troubleshooting page named the failure, but the higher-leverage move is changing the stack choice, support layer, or production workflow.
Lovable reviews
Open this when the same full-stack MVP failures keep repeating and you need a harder answer on whether Lovable is still the right bet.
Open this next →
Cursor review
Open this when the pattern behind the bug is really about generated speed versus owning more of the stack in code.
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Deploy hub
Open this when the fix is exposing a bigger production handoff problem, not just one broken feature.
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Tool picker
Open this when the repeated bug is making you question the whole stack choice instead of the latest patch.
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Firecrawl review
Open this when the app also needs live web data and the next stack decision is no longer only about the builder itself.
Open this next →
Quick Fix Summary
| Issue | Deployment failed |
| Fastest fix | Read the build logs |
| Use this page if | Deployment shows 'Build failed' |
Symptoms
- !Deployment shows 'Build failed'
- !App works in preview but fails on deploy
- !Missing environment variables error
- !White screen after deployment
Step-by-Step Fix
Read the build logs
Click on the failed deployment to see the full build log. Look for the first error message — that's usually the root cause.
Check environment variables
Ensure all required environment variables (Supabase URL, API keys, Stripe keys) are set in Lovable's deployment settings.
Fix TypeScript errors
Lovable's development mode may ignore some TypeScript errors. Deployment builds are stricter. Fix any type errors shown in the logs.
Clear and rebuild
Sometimes a clean rebuild fixes deployment issues. Delete the deployment and create a new one.
Check for large files
Deployments may fail if your project includes very large files (images, videos). Use external hosting for large media.
Frequently Asked Questions
Preview mode is more lenient with errors. Deployment builds use stricter settings. Check for TypeScript errors and missing environment variables.