Waymark / Routes / docs.railway.com Reference variables between Railway services using template syntax
domain: docs.railway.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Set a variable's value to a template reference rather than a literal. Reference a variable in another service: ${{SERVICE_NAME.VAR_NAME}}. Reference a project shared variable: ${{shared.VAR_NAME}}. Reference Railway-provided variables (e.g. RAILWAY_PUBLIC_DOMAIN, RAILWAY_PRIVATE_DOMAIN, RAILWAY_PROJECT_ID, RAILWAY_SERVICE_ID) which Railway injects automatically. When read back with unrendered:true the raw template is returned; resolved queries return the actual value. Docs: https://docs.railway.com/variables Known gotchas Reference variables only resolve when the referenced service/variable exists — a broken reference can deploy with an empty/null value. Values can be a plain reference, or prepend literal text to a reference (e.g. http://${{api.RAILWAY_PRIVATE_DOMAIN}}:3000). Circular references between services are invalid.
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