next-triple-env

This is a package that allows you to construct a Zod-validated 3-environment schema for Next.JS Pages Router.

Inspired by t3-env

Uses next-runtime-env version 1

Environments

server - Accessible only on the server (live env vars)

shared - Accessible on the server and the client (live env vars)

[!NOTE] These variables are prefixed with NEXT_PUBLIC_

static - Accessible on the server and the client (baked in on build)

[!NOTE] These variables are prefixed with NEXT_STATIC_

When server variables are accessed from a browser context, an error will be thrown.

When in dev mode, each schema will be separately validated upon access.

When building, only the static schema will be validated.

On production start, all schemas will be validatd.

If process.env.NODE_ENV === 'production', individual schemas will not revalidated upon access

Example usage

Create a file env.ts

1import { createEnv } from 'next-triple-env'
2
3export const env = createEnv({
4  server: {
5    TOKEN_SECRET: z.string(),
6    TOKEN_EXPIRATION_MINUTES: z.coerce.number()
7  },
8  shared: {
9    NEXT_PUBLIC_API_URL: z.string()
10  },
11  static: {
12    NEXT_STATIC_GOOGLE_ANALYTICS_TAG: z.string().optional()
13  },
14
15  staticEnvVars: {
16    NEXT_STATIC_GOOGLE_ANALYTICS_TAG: process.env.NEXT_STATIC_GOOGLE_ANALYTICS_TAG
17  }
18})

Edit your Next config:

1import { config } from 'next-triple-env/config'
2import { env } from './env'
3
4export default config(env, {
5  // ...your config
6}, {
7  // ...next-runtime-env config
8})

Now use this file anywhere:

1import { env } from './env'
2
3console.log(env.shared.NEXT_PUBLIC_API_URL)

Standalone

If using output: 'standalone', you can set up a script to run before starting your server

1// prestandalone.ts
2import { prestandalone } from 'next-triple-env/prestandalone'
3import { env } from './env'
4
5prestandalone(env, {
6  // ...next-runtime-env config
7})

Disabling Validation

Besides for env.skip(), validation can be skipped by setting the SKIP_ENV_VALIDATION environment variable.

The value can be any permutation of the 3 environments (server, shared, static) joined by commas without spaces, or all or true for all 3 environments.