How to Deploy an App on Railway in 2026: Repo to Live Domain

You finished the project, it runs on localhost, and there's nothing to send anyone. No link. Railway closes that gap without asking you to learn a deployment pipeline first.

Short answer: connect your GitHub repository through New Project → Deploy from GitHub repo, grant access to the repo, wait for the build to finish, add your environment variables, attach a database if the app needs one, then open the service settings and click Generate Domain. A minute later the app answers on a public HTTPS address.

What is Railway and does the automatic build really work?

Railway is a cloud platform that inspects your repository and figures out the rest. It reads the project files, detects the language and package manager, installs dependencies and runs the build with no Dockerfile and no CI config. If a Dockerfile is present, Railway uses it instead of guessing.

A database, a cache, a worker and the backend itself live inside one project as separate services on a shared private network. Variables move between them as references rather than copy-paste, so rotating a connection string doesn't mean editing four places.

It handles Node.js, Python, Go, Ruby, PHP, Rust, static sites and monorepos. The weak spot: if your app needs unusual system packages or a pinned runtime, autodetection can miss, and you'll write a Dockerfile by hand.

How do you deploy an app to Railway step by step?

1. Prepare the repository. Make sure the project starts with a single command and reads its port from the PORT environment variable instead of a hardcoded number. Secrets stay in .env, and .env stays in .gitignore. Result: a repo that survives automatic builds with no leaked keys in the history.

2. Create the project. In the Railway dashboard press New Project, pick Deploy from GitHub repo, install the Railway app on your GitHub account and open access to that one repository. Result: the service exists and the first build starts by itself.

3. Read the build logs. Open the logs tab and watch the build move into the deploy stage. This is where you see which runtime was detected and which start command was chosen for you. Result: you know whether it compiled, and if not, at which step it stopped.

4. Set environment variables. In the service settings open Variables and move over what your .env holds: API keys, connection strings, the environment mode. The service restarts on save. Result: the app can see its secrets and stops crashing on boot.

5. Add a database. Use the New button inside the project to add PostgreSQL, MySQL, Redis or MongoDB. Railway creates the connection variables, and your service points at them through a variable reference instead of a pasted value. Result: the database sits on the project's private network and isn't exposed publicly.

6. Check the build and start commands. If autodetection guessed wrong, set Build Command and Start Command manually in Settings. For a monorepo, point Root Directory at the right folder. Result: the service boots with the command you actually meant.

7. Generate a domain. In Settings → Networking press Generate Domain. Railway hands you a subdomain on its own domain with HTTPS already in place. Result: a working link you can send to a client.

8. Attach your own domain. In the same panel press Custom Domain, enter the address, copy the suggested CNAME record and add it at your registrar. Result: the app opens on your domain with a valid certificate.

9. Turn on auto-deploy. Confirm the service watches the branch you want. From then on every push triggers a build, and the deployment history lets you roll back. Result: shipping to production becomes git push.

Why does the deploy succeed but the domain return an error?

The usual causes, roughly in order of how often they happen:

• the app listens on a hardcoded port instead of the port variable, so traffic never reaches it;
• the server binds to 127.0.0.1 when it needs 0.0.0.0;
• no domain was generated: the service runs, it just has no public address;
• a missing environment variable kills the process right after start, which the deploy logs show plainly;
• migrations were never applied and the first database query breaks the response;
• the frontend was built with an API address pointing at localhost.

Check in this order: deploy logs → Variables → Networking. The answer is usually on step one.

Railway or Replit: which should you use for your project?

Plenty of people use both. The prototype gets built in Replit or Lovable, the code moves into a repository, and Railway takes it to production. For a backend with auth and file storage, Supabase pairs well, while the frontend runs as another service in the same project. More on hosting and infrastructure in the Infrastructure section.

What else is useful alongside the deploy

• Railway Hobby for a year — the cloud this whole article is about;
• Cursor Pro for AI-assisted coding — fixes build errors right in the editor;
• Supabase Pro as a year of credits — database, auth and storage for the app;
• Warp Build — a terminal with AI suggestions — handy for git and CLI work;
• Jam on the Team plan — bug reports with console logs after release.

FAQ

Do I need a Dockerfile? No. For standard stacks Railway builds the project on its own. Reach for a Dockerfile when you need system packages or a specific runtime version.

Can I deploy the frontend and backend separately? Yes. Create two services in one project, from the same repo or different ones, and give each its own Root Directory. Domains are generated per service.

How do I roll back a broken release? Open the deployment history, pick the last working build and hit redeploy. It comes back up without rebuilding from Git.

I already own a domain — what now? Add it through Custom Domain and create the CNAME record at your registrar. Railway issues the certificate once DNS checks out.

How do I get Railway through subs-ai.com? Order the subscription in the catalog and you get access to Railway Hobby for a year. Activation instructions arrive after payment.

Bottom line

Repo to live link takes a few minutes: connect GitHub, add variables, generate a domain. What's left is pointing your own address at it and picking the branch that triggers builds. If the project is meant to stay up for a year, browse the subs-ai.com catalog — Railway sits next to the services the same project usually needs anyway: an AI editor, a database, analytics.