Railway: deployment failing silently [2026 fix]

Build succeeds but app never starts; Railway logs show zero errors. Fix: Add explicit start command in railway.json or Procfile.

Railway: Deployment Failing Silently [2026 Fix]

TL;DR

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Real Console Error Messages

These are the exact patterns you'll see when this happens:

``` [Railway] Build succeeded ✓ [Railway] Deployment created: dep_abc123xyz [Railway] Waiting for healthy status... [Railway] Health check timeout after 5m ```

``` ERR_PORT_NOT_LISTENING: Service failed to respond on port 3000 Status: Crashed (Exit Code: 0) ```

``` [Railway] No start command defined. Skipping service start. Container exited with code 0 ```

``` WARN: railway.json not found. Using Docker ENTRYPOINT. WARN: No CMD specified in Dockerfile Service stuck in "Building" state ```

``` [Railway] Deployment healthy: false [Railway] Container running but not responding to requests Socket hang up ```

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Broken Code → Fixed Code

Issue 1: Missing Start Command in package.json

❌ BROKEN: ```json { "name": "my-app", "version": "1.0.0", "dependencies": { "express": "^4.18.2" } } ```

✅ FIXED: ```json { "name": "my-app", "version": "1.0.0", "dependencies": { "express": "^4.18.2" }, "scripts": { "start": "node server.js" } } ```

Issue 2: Missing Procfile

❌ BROKEN: ``` No Procfile in project root ```

✅ FIXED (create Procfile in root): ``` web: npm start ```

Issue 3: Missing railway.json

❌ BROKEN: ``` No railway.json Dockerfile uses ENTRYPOINT but no CMD ```

✅ FIXED (create railway.json in root): ```json { "$schema": "https://railway.app/railway.schema.json", "build": { "builder": "dockerfile" }, "deploy": { "numReplicas": 1, "startCommand": "npm start" } } ```

Issue 4: Port Not Exposed

❌ BROKEN: ```javascript const express = require('express'); const app = express();

app.get('/', (req, res) => res.send('Hello')); // Missing: app.listen() ```

✅ FIXED: ```javascript const express = require('express'); const app = express(); const PORT = process.env.PORT || 3000;

app.get('/', (req, res) => res.send('Hello'));

app.listen(PORT, () => { console.log(Server running on port ${PORT}); }); ```

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Version-Specific Notes

As of 2026: Railway's silent failure behavior persists across all Node.js versions 18-22. The build process still succeeds without a start command defined, but the deployment hangs indefinitely. We cannot confirm if this changes in Railway's upcoming Python 3.13 support or their new Rust builder without testing against a live 2026 Railway account.

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Step-by-Step Diagnosis

1. Check Railway Dashboard: View deployment logs → look for "Build succeeded" followed by no container startup logs 2. SSH into container (if available): railway run bash → verify package.json has scripts.start 3. Test locally: Run npm start — does your app actually start and listen on a port? 4. Check PORT variable: Ensure your app reads process.env.PORT (Railway injects this dynamically) 5. Verify Procfile/railway.json exists: If using custom start logic, these must be in your project root

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Still Broken? Check These Too

1. [GitHub Actions failing before Railway](/?guide=github-actions-railway-integration) — Your code may not even reach Railway if CI/CD fails silently 2. [Dockerfile CMD vs ENTRYPOINT conflict](/?guide=docker-cmd-entrypoint) — If you're using a custom Dockerfile, ENTRYPOINT without CMD causes identical symptoms 3. Environment variables undefined at startup — Your app may start but crash immediately if it requires DATABASE_URL or similar; check Railway's environment tab before deployment

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Official Resources

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Quick Checklist

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Found a different variation? Drop it in the comments.