Railway: deployment failing silently [2026 fix]

Your Railway build completes but app never starts—usually a missing PORT env var or broken Procfile. Set PORT explicitly and validate your start command.

Railway: Deployment Failing Silently [2026 Fix]

TL;DR

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Exact Error Messages from Console

These appear in Railway's deployment logs when you click "View Logs":

``` [ERROR] Build succeeded but container exited with code 1 ```

``` [WARN] No process detected. Add a Procfile or ensure package.json has a "start" script ```

``` Error: listen EADDRINUSE :::undefined at Server.setupListenHandle [as _listen2] (net.js:1058:15) ```

``` [DEPLOY] Container started but health check failed after 30s - no response on any port ```

``` FATAL ERROR: JavaScript heap out of memory 1: 0x103f0b0 node::Abort() [node] ```

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Broken Code vs. Exact Fix

Problem 1: Missing PORT Environment Variable

BROKEN: ```javascript // server.js const express = require('express'); const app = express();

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

FIX: ```javascript // server.js const express = require('express'); const app = express(); const PORT = process.env.PORT || 3000;

app.listen(PORT, '0.0.0.0', () => { console.log(Server running on port ${PORT}); }); ```

What changed: Added fallback value || 3000 and explicitly bind to 0.0.0.0 (required for Railway containers).

Problem 2: Invalid Procfile Path

BROKEN: ``` web: node ./src/server.js ``` (file actually located at ./server.js in root)

FIX: ``` web: node server.js ```

What changed: Corrected path to match actual file location. Verify with ls -la in your repo root.

Problem 3: Missing start Script

BROKEN package.json: ```json { "name": "myapp", "version": "1.0.0", "scripts": { "dev": "nodemon server.js" } } ```

FIXED package.json: ```json { "name": "myapp", "version": "1.0.0", "scripts": { "start": "node server.js", "dev": "nodemon server.js" } } ```

What changed: Added required "start" script. Railway looks for this first when no Procfile exists.

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Railway-Specific Setup Checklist

1. Environment Variables: In Railway dashboard → Settings → Variables, add: ``` PORT=3000 NODE_ENV=production ```

2. Binding Address: Always use 0.0.0.0 not localhost in containerized environments.

3. Health Check: Railway expects a 2xx response within 30 seconds. If your app takes longer to initialize, add: ```javascript app.get('/health', (req, res) => res.send('ok')); ```

4. Build Command: Ensure Railway detects your builder. For Node, verify package.json exists in root. For Python, add Procfile explicitly.

*Note on version specificity:* These recommendations apply to Railway's 2024-2026 deployment system. If you're using Railway legacy (pre-2024), the Procfile format remains identical but environment variable inheritance differs—explicitly set all vars rather than relying on .env files.

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Still Broken? Check These Too

1. Memory Leak or Infinite Loop: Check for recursive function calls or event listener accumulation. Run node --max-old-space-size=512 server.js locally to reproduce heap errors.

2. Missing Dependencies: Ensure all require() modules are in package.json. Run npm ci locally to verify lock file matches. Railway installs package-lock.json or yarn.lock in this order.

3. Port Conflict on Local Testing: If you tested with a hardcoded port (e.g., 3000), Railway's default port may differ. Always use process.env.PORT in production code—see [environment variables guide](/?guide=env-variables) and [Node.js best practices](/?guide=nodejs-production).

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Official Documentation

Refer to [Railway's Official Node.js Deployment Docs](https://docs.railway.app/guides/nodejs) for latest buildpack behavior and [Procfile format reference](https://docs.railway.app/reference/config-as-code).

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Debugging at 2am: Quick Win Script

Run this in your repo before pushing:

```bash grep -q '"start"' package.json || echo "⚠️ Missing start script" test -f Procfile || echo "⚠️ No Procfile found" grep -q 'PORT' package.json || grep -q 'PORT' Procfile || echo "⚠️ No PORT usage detected" ```

Fix any warnings before deployment.

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Found a different variation? Drop it in the comments—especially if you hit this on Python, Go, or Docker-based Railway deployments. The silent failure pattern can differ across runtimes.