The new package helps sync deployment information across separate Vercel projects, ensuring your applications always reference the latest preview or production deployment URLs without manual updates or environment variable changes.@vercel/related-projects Previously, developers had to manually enter deployment URLs, manage connection strings, or use environment variables to keep the projects communicating effectively. Now, this data is automatically available and updated at both build and runtime. For example, a monorepo containing: Related Projects can now ensure that each preview deployment of the frontend automatically references the corresponding preview deployment of the backend, avoiding the need for hardcoded values when testing changes that span both projects.

Related Projects are linked using a Vercel project ID. You can in the project page in the Vercel dashboard.find your project IDSettings Learn more about .linking related projects Read more A frontend Next.js project that fetches data from an API An backend Express.js API project that serves the data