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feat: add schema-based environment validation using Zod #131

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631035e
feat: add schema-based environment validation using Zod
KGFCH2 May 31, 2026
9500edc
Merge branch 'main' into feat/backend-env-validation
KGFCH2 May 31, 2026
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56 changes: 22 additions & 34 deletions server/config/env.js
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Original file line number Diff line number Diff line change
@@ -1,43 +1,31 @@
import dotenv from "dotenv";
import { z } from "zod";

dotenv.config();

const requiredEnvVars = [
"PORT",
"MONGO_URI",
"JWT_SECRET",
"JWT_EXPIRES_IN",
// JWT_REFRESH_SECRET must be a separate key from JWT_SECRET.
// Using the same key for both would allow forging refresh tokens from an access token.
"JWT_REFRESH_SECRET",
"GEMINI_API_KEY",
"CLIENT_URL",
"NODE_ENV",
"SMTP_HOST",
"SMTP_PORT",
"SMTP_USER",
"SMTP_PASS"
];
const envSchema = z.object({
PORT: z.string().default("5000").transform((val) => parseInt(val, 10)),
MONGO_URI: z.string().min(1, "MONGO_URI is required"),
JWT_SECRET: z.string().min(8, "JWT_SECRET must be at least 8 characters long"),
JWT_EXPIRES_IN: z.string().default("24h"),
GEMINI_API_KEY: z.string().min(1, "GEMINI_API_KEY is required"),
CLIENT_URL: z.string().min(1, "CLIENT_URL is required"),
NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
SMTP_HOST: z.string().min(1, "SMTP_HOST is required"),
SMTP_PORT: z.string().transform((val) => parseInt(val, 10)),
SMTP_USER: z.string().min(1, "SMTP_USER is required"),
SMTP_PASS: z.string().min(1, "SMTP_PASS is required")
});

const missingEnvVars = requiredEnvVars.filter(envVar => !process.env[envVar]);
const parsed = envSchema.safeParse(process.env);

if (missingEnvVars.length > 0) {
throw new Error(`Missing required environment variables: ${missingEnvVars.join(", ")}`);
if (!parsed.success) {
console.error("❌ Invalid environment variables:");
parsed.error.errors.forEach((err) => {
console.error(` - ${err.path.join(".")}: ${err.message}`);
});
process.exit(1);
}

export const env = {
PORT: process.env.PORT,
MONGO_URI: process.env.MONGO_URI,
JWT_SECRET: process.env.JWT_SECRET,
JWT_EXPIRES_IN: process.env.JWT_EXPIRES_IN,
JWT_REFRESH_SECRET: process.env.JWT_REFRESH_SECRET,
GEMINI_API_KEY: process.env.GEMINI_API_KEY,
CLIENT_URL: process.env.CLIENT_URL,
NODE_ENV: process.env.NODE_ENV,
SMTP_HOST: process.env.SMTP_HOST,
SMTP_PORT: parseInt(process.env.SMTP_PORT, 10),
SMTP_USER: process.env.SMTP_USER,
SMTP_PASS: process.env.SMTP_PASS
};

export const env = parsed.data;
export default env;