More flexible Environment Variables in Edge Functions and Middleware

Note: This changelog entry is historical. Edge Functions are deprecated for new projects. Use Vercel Functions with the Node.js runtime and Fluid compute. Use Routing Middleware for request-time routing before a response completes.

You now have more flexible access and improved limits for environment variables from functions using the Edge Runtime and Routing Middleware:

• The max environment variable size is now 64KB instead of 5KB, same as Vercel Functions.

• Other than the reserved names, there are no additional restrictions to name environment variables.

• Accessing process.env is no longer restricted to be statically analyzable. This means that, for example, you can now compute variable names such as process.env[${PREFIX}_SECRET].

Check out the documentation to learn more.