Node.js Bindings

The Node.js binding has a book of its own:

→ dynamic-config for Node.js

npm install dynamic-config-node

import { DynamicConfig, zodValidator } from "dynamic-config-node"
import { z } from "zod"

const Database = z.object({ host: z.string(), port: z.number().default(5432) })

const db = await new DynamicConfig({ key: "db", validate: zodValidator(Database) })
  .file("config.toml")
  .env("APP_")
  .initAndCurrent()
//    ^? { host: string; port: number }

Rust resolves, your schema validates, JavaScript reads a cached object. One prebuilt binary per platform through Node-API, so the same binary serves every Node version the package claims and nothing compiles at install time.

Why it is a separate book

The same reason the Python one is: the reader is a different person. A Node programmer arriving from npm should not land in a sidebar whose first twenty entries are Rust, and a Rust programmer carries no chapters about an event loop. The store crates stay in this book — a Consul chapter is read by whoever read the builder tour.

What is in it