Last updated: April 13, 2026
Env Validator for TypeScript Developers
Quick Answer
DevToolHQ's env validator works great alongside TypeScript. Use it to quickly env validator during development, then integrate the pattern into your TypeScript codebase using the code example below.
Use Cases in TypeScript
- 1.Validate required env vars at application startup
- 2.Catch missing configuration before deployment
- 3.Type-check environment variable values
- 4.Provide clear error messages for missing config
TypeScript Code Example
import { z } from 'zod'; // npm install zod
const envSchema = z.object({
NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
DATABASE_URL: z.string().url(),
SECRET_KEY: z.string().min(32),
PORT: z.coerce.number().int().positive().default(3000),
REDIS_URL: z.string().url().optional(),
});
export type Env = z.infer<typeof envSchema>;
const _env = envSchema.safeParse(process.env);
if (!_env.success) {
console.error('Invalid environment variables:');
console.error(_env.error.flatten().fieldErrors);
process.exit(1);
}
export const env: Env = _env.data;Try the tool directly
Free, no signup — works in your browser
Frequently Asked Questions
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