Hello,

You would want to be using a reference variable -

https://docs.railway.com/guides/variables#referencing-another-services-variable

Hi I have problem with postgres data base. Mu postgres data is not connecting. I haven't internet problem. But I don't know why it is not connecting

Hi

your database has two variables, that you can use to connect it to services inside railway and outside of it.
If you used default postgress db, then it'll be something like this:

${{Postgres.DATABASE_URL}}
- add this in your service who needs db inside railway, it'll be connected.

${{Postgres.DATABASE_PUBLIC_URL}}
- if you want a url that you can connect to from outside of railway, then use this.
- remember, this will add egress cost to your final bill, as this traffic will be going outside of railway which will incur the cost as egress.

Use a Reference Variable to wire your DB to the app

Brody’s right: don’t paste credentials - reference your DB service’s DATABASE_URL.

Steps

• 1. Put your app and database in the same Railway project.

• 2. In your app → Variables, add:

DATABASE_URL = ${{<DB_SERVICE_NAME>.DATABASE_URL}}

(e.g., postgres, db, postgresql). This uses Railway’s template syntax for Reference Variables.

• 3. Deploy the staged change so the new env var is applied to the running service.

Notes

• Railway’s Postgres exposes PGHOST/PGPORT/PGUSER/PGPASSWORD/PGDATABASE and a ready-to-use DATABASE_URL; most ORMs read DATABASE_URL automatically.

• Need to connect from outside Railway (local laptop, BI tool)? Enable a TCP Proxy on the DB service and use the generated domain:port. (Prefer internal networking between Railway services when possible.)

• To test locally with the same env vars:

railway run <your start command>

(injects your project’s variables into the local process).