Cloudflare Platform Environment Variables

Platform-injected build-time and runtime environment variables, shown via each access method.

Pages Build-time Variables

Injected by Cloudflare Pages during the build step. Docs

Workers Builds Variables

Injected by Workers Builds (CI/CD) during the build step. Docs

Pages Build Image Tool Overrides

Recognised by the Pages build environment to control which versions of languages and tools are used. Docs

NODE_ENV

Statically replaced at build time by Wrangler/esbuild. "development" for wrangler dev, "production" for wrangler deploy. Docs

Runtime: env parameter

The standard way to access bindings and variables. Passed as the second argument to the fetch handler, or on context.env in Pages Functions. Docs

Runtime: process.env

Available when nodejs_compat is enabled and compatibility_date >= 2025-04-01. Populated lazily on first access of process. JSON vars that resolve to strings are parsed; others are JSON-stringified. Docs

Runtime: import { env } from "cloudflare:workers"

Global import approach. Useful for accessing bindings from top-level scope or deeply nested functions without threading env through every call. Docs