Railway: deployment failing silently [2026 fix]

Build succeeds but app crashes on start—usually missing env vars or broken Procfile. Add Railway secrets and verify runtime config.

Railway: Deployment Failing Silently [2026 Fix]

TL;DR

Fix: Check Railway logs via CLI (railway logs), add missing environment variables to Railway project settings, and verify your Procfile or package.json start script matches your actual entry point.

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Real Console Error Messages

Here are exact error patterns you'll see in Railway logs:

``` Error: listen EADDRINUSE :::3000 at Server.setupListenHandle [as _listen2] (net.js:1072:16) at listenInClusterMode (cluster.js:609:5) ```

``` Error: ENOMEM: Cannot allocate memory, spawn at ChildProcess.spawn (internal/child_process.js:412:23) ```

``` Cannot find module 'dotenv' at Function.Module._load (internal/modules/commonjs/loader.js:1128:36) at Module.require (internal/modules/loader.js:897:13) ```

``` MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017 at Timeout._onTimeout (node_modules/mongoose/lib/drivers/node/index.js:146:23) ```

``` Error: getaddrinfo ENOTFOUND postgres.local at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:66:76) ```

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The Problem: Build Succeeds, App Dies

Railway's UI shows a green checkmark and "Deployment Successful," but your app is actually crashing within seconds of starting. This happens because:

1. Build phase runs fine (dependencies install, code compiles) 2. Startup phase fails silently (Railway doesn't expose logs by default) 3. Container exits, but Railway marks it as "healthy" based on the build, not runtime

The fix requires checking actual runtime logs and environment configuration.

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Broken Code → Fixed Code

Problem 1: Missing Environment Variables

Broken (server.js): ```javascript const PORT = process.env.PORT || 3000; const DB_URL = process.env.DATABASE_URL; // undefined! const mongoose = require('mongoose');

mongoose.connect(DB_URL); // crashes here silently ```

Fixed (server.js): ```javascript const PORT = process.env.PORT || 3000; const DB_URL = process.env.DATABASE_URL;

if (!DB_URL) { console.error('FATAL: DATABASE_URL not set in Railway environment'); process.exit(1); }

const mongoose = require('mongoose'); mongoose.connect(DB_URL).catch(err => { console.error('Connection error:', err.message); process.exit(1); }); ```

Railway Fix: Go to Railway Dashboard → Select your project → Variables tab → Add: ``` DATABASE_URL = your_connection_string NODE_ENV = production ```

Problem 2: Invalid Procfile

Broken (Procfile): ``` web: npm run build && node dist/server.js ``` *(Procfile shouldn't include build commands—that's the build phase's job)*

Fixed (Procfile): ``` web: node dist/server.js ```

Or remove Procfile entirely and update package.json: ```json { "scripts": { "build": "tsc", "start": "node dist/server.js", "dev": "ts-node src/server.ts" } } ```

Railway will auto-detect and use start script.

Problem 3: Port Binding Issue

Broken: ```javascript app.listen(3000); // hardcoded ```

Fixed: ```javascript const PORT = process.env.PORT || 3000; app.listen(PORT, () => { console.log(Server running on port ${PORT}); }); ```

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How to Actually See the Errors

Via Railway CLI (fastest):

Via Railway Dashboard:

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Still Broken? Check These Too

1. Port Not Exposed: Railway needs your app listening on process.env.PORT. If you're binding to 127.0.0.1:3000 instead of 0.0.0.0:PORT, Railway can't reach it. Check [Docker container networking guide](/?guide=docker-network).

2. Build Cache Issues: Clear Railway's build cache (Dashboard → Settings → Clear build cache) and redeploy. Sometimes old dependencies cause silent failures.

3. Dependency Tree Conflicts: Run npm ls locally to check for unmet peer dependencies. Railway's build environment may have different Node/npm versions. I'm uncertain whether Railway uses Node 18 LTS vs 20 LTS by default in 2026—check your deployment logs for Node v##.#.#.

4. Memory Limits: Railway's free tier has 512MB RAM. Large apps crash silently on startup. Check [memory optimization guide](/?guide=railway-memory).

5. Start Script Missing: If your package.json has no start script and no Procfile, Railway won't know how to run your app.

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Official Resources

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Quick Checklist

Found a different variation? Drop it in the comments—Railway's behavior shifts with updates, and community feedback saves others 2am debugging. 🚂