Indian PIN Code Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching indian pin code, ported and verified for JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// Indian PIN Code
// ReDoS-safe | RegexVault — Localization > Postal Codes

const indianPinCodeRegex = /^[1-9][0-9]{5}$/;

function validateIndianPinCode(input: string): boolean {
  return indianPinCodeRegex.test(input);
}

// Example
console.log(validateIndianPinCode("110001")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Postal Codes category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Indian PIN code structure: first digit = postal zone (1-9, excludes 0), second digit = sub-zone, third digit = sorting district, last 3 digits = individual post office. Delhi is 110xxx, Mumbai is 400xxx.