What Railpack detects
Railpack inspects the repository and picks the build for Node.js; most projects need no configuration. A Dockerfile in the repository always wins.
- package.json (
startscript ormain) - lockfile: pnpm / npm / yarn
- .nvmrc /
engines.node
- Builder
- Railpack (default)
- Start command
- npm start
Derived by Railpack; override it in Settings → Deploy → Start command.

