What causes "Vercel Deployment Failed: Build Error"?

Type or lint errors that only fail in a production build Module not found from case-sensitive import paths (works on macOS/Windows, fails on Linux) Missing environment variables at build time Invalid vercel.json or wrong Framework Preset / Root Directory Stale or corrupted build cache Build exceeded the 45-minute limit or memory limit

How do I fix "Vercel Deployment Failed: Build Error"?

1. Find the first real error in the build log: Open the project > Deployments and select the failed deployment Expand the Building accordion in Deployment Details Scroll up from 'exited with 1' to the first line marked Error and fix that 2. Reproduce the build locally: Run the exact build command locally (e.g. npm run build) Fix TypeScript, lint or import errors it reports Check import paths match file names exactly, including upper/lower case 3. Check project build settings: Settings > Build and Deployment > Framework Settings: pick the correct Framework Preset Confirm Root Directory points to the app folder in a monorepo Confirm Build Command and Output Directory overrides are correct 4. Redeploy without the build cache: On the deployment, click Redeploy Uncheck 'Use existing Build Cache' Or run vercel --force, or set VERCEL_FORCE_NO_BUILD_CACHE=1 5. Handle builds that fail with no log: Validate vercel.json syntax Check the Ignored Build Step setting is not skipping the build Check the Provisioning Integrations step for a failed Marketplace integration

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Vercel Deployment Failed: Build Error

Ongoing Web (Vercel dashboard, Vercel CLI, GitHub/GitLab/Bitbucket) Updated October 21, 2026

Quick answer

A failed Vercel deployment almost always has its real cause a few lines above the final 'Command "npm run build" exited with 1' line. Run the same build locally, fix the first red error in the build log, then redeploy without the build cache.

Most likely fix: Find the first real error in the build log.

Symptoms

Deployment shows Error status; build log ends with 'Command "npm run build" exited with 1' (or yarn/pnpm), or an overlay says the build could not start and no build log is shown.

Why it happens

Type or lint errors that only fail in a production build
Module not found from case-sensitive import paths (works on macOS/Windows, fails on Linux)
Missing environment variables at build time
Invalid vercel.json or wrong Framework Preset / Root Directory
Stale or corrupted build cache
Build exceeded the 45-minute limit or memory limit

How to fix it

Try these in order — the most common fix is first.

1. Find the first real error in the build log
1. Open the project > Deployments and select the failed deployment
2. Expand the Building accordion in Deployment Details
3. Scroll up from 'exited with 1' to the first line marked Error and fix that
2. Reproduce the build locally
1. Run the exact build command locally (e.g. npm run build)
2. Fix TypeScript, lint or import errors it reports
3. Check import paths match file names exactly, including upper/lower case
3. Check project build settings
1. Settings > Build and Deployment > Framework Settings: pick the correct Framework Preset
2. Confirm Root Directory points to the app folder in a monorepo
3. Confirm Build Command and Output Directory overrides are correct
4. Redeploy without the build cache
1. On the deployment, click Redeploy
2. Uncheck 'Use existing Build Cache'
3. Or run vercel --force, or set VERCEL_FORCE_NO_BUILD_CACHE=1
5. Handle builds that fail with no log
1. Validate vercel.json syntax
2. Check the Ignored Build Step setting is not skipping the build
3. Check the Provisioning Integrations step for a failed Marketplace integration

This guide also covers

vercel deployment failed
vercel build failed
command npm run build exited with 1 vercel
vercel build error
vercel deploy error

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