Railway: deployment failing silently [2026 fix]

Railway silently fails when build output exceeds memory or logs aren't flushed; add explicit error handling and flush stdout before exit.

Railway: Deployment Failing Silently [2026 Fix]

TL;DR

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Real Console Error Messages

Here are exact error patterns you'll see (or won't see):

``` 1. "Build failed" (no details) Exit code: 1, but no stack trace

2. [ERROR] Build step exited with code 1 [INFO] Cleaning up deployment (then complete silence)

3. fatal: repository not found (from git clone in build, lost in logs)

4. FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed JavaScript heap out of memory (process dies, Railway shows "Unknown error")

5. Timeout waiting for healthcheck on port 3000 Application did not start within 120 seconds ```

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Code: Broken vs. Fixed

Problem #1: No Error Handling in Build Script

❌ BROKEN: ```javascript // package.json "build" script "build": "next build && prisma generate" ``` If next build fails silently (e.g., due to OOM), the process exits without Railway seeing the error.

✅ FIXED: ```javascript // package.json "build": "set -e; next build && prisma generate && echo 'Build complete'; exec 2>&1; echo $?" ``` Or in build.sh: ```bash #!/bin/bash set -e # Exit on any error set -o pipefail # Catch pipe errors

next build if [ $? -ne 0 ]; then echo "ERROR: Next.js build failed" >&2 exit 1 fi

prisma generate exec 2>&1 # Flush stderr exit 0 ```

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Problem #2: Missing railway.json Configuration

❌ BROKEN: ```json // No railway.json or incomplete config { "$schema": "https://railway.app/railway.schema.json", "build": { "builder": "dockerfile" } } ``` Railway uses defaults that may timeout or OOM before logging.

✅ FIXED: ```json { "$schema": "https://railway.app/railway.schema.json", "build": { "builder": "nixpacks" }, "deploy": { "numReplicas": 1, "restartPolicyType": "on_failure", "restartPolicyMaxRetries": 1, "healthcheck": { "httpPath": "/health", "initialDelaySeconds": 10, "timeoutSeconds": 5, "intervalSeconds": 10, "successThreshold": 1, "failureThreshold": 3 } } } ```

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Problem #3: Process Exits Before Logs Flush

❌ BROKEN: ```javascript // server.js const server = app.listen(3000, () => { console.log('Server started'); });

process.on('SIGTERM', () => { process.exit(0); // Exits immediately }); ```

✅ FIXED: ```javascript // server.js const server = app.listen(3000, () => { console.log('Server started'); });

process.on('SIGTERM', () => { console.error('SIGTERM received, shutting down gracefully...'); process.stderr.write(''); // Flush stderr server.close(() => { console.log('Server closed'); process.stdout.write(''); // Flush stdout process.exit(0); }); // Force exit after 30s setTimeout(() => { console.error('Forced shutdown after 30s timeout'); process.exit(1); }, 30000); }); ```

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Still Broken? Check These Too

1. Memory Limits Exceeded During Build Check your Dockerfile or nixpacks config. Node builds can spike to 2GB+. Set NODE_OPTIONS="--max-old-space-size=2048" in environment variables. [Memory optimization guide](/?guide=railway-memory-limits)

2. Git Credentials or Private Dependencies If your build clones private repos, Railway loses the error. Add SSH keys to Railway secrets and verify with railway run sh -c 'git ls-remote [private-repo]'. [SSH troubleshooting](/?guide=railway-git-auth)

3. Port Binding Race Condition Ensure your app binds to process.env.PORT || 3000, not a hardcoded port. Railway assigns ports dynamically; if your app ignores this, the healthcheck times out and the build gets marked as failed.

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Version & Uncertainty Note

This guide applies to Railway (2024–2026). Railway's logging behavior changed in early 2025; if you're seeing *different* silent failures, the log buffering strategy in their nixpacks integration may differ. Test with railway logs --tail=100 *while* deploying to verify what's captured.

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Official Resources

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Found a different variation? Drop it in the comments.