fail-fast

import { z } from "zod";

const booleanFromString = z.preprocess((val) => {
  if (typeof val !== "string") return val;
  return ["true", "1", "yes", "on"].includes(val.toLowerCase());
}, z.boolean());

Typed env parsing with zod

typescript zod validation

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typescript

import { z } from "zod";

const booleanFromString = z
  .string()
  .transform((v) => v.trim().toLowerCase())
  .pipe(z.enum(["true", "false", "1", "0"]))

Type-Safe Environment Variable Parsing and Validation With Zod

config zod environment

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