Google API Key Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching google api key, ported and verified for JavaScript. In security-sensitive code, using an unverified regex can open the door to both false positives and denial-of-service attacks. 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

// Google API Key
// ReDoS-safe | RegexVault — Security > API Keys & Tokens

const googleApiKeyRegex = /^AIza[0-9A-Za-z_-]{30,45}$/;

function validateGoogleApiKey(input: string): boolean {
  return googleApiKeyRegex.test(input);
}

// Example
console.log(validateGoogleApiKey("AIzaSyD-9tSrke72I6e0qOZVOtU5oBRBmBPUfhI")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Security > API Keys & Tokens 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

Google API keys starting with AIza are used for Maps, YouTube, Firebase, and other Google APIs. Keys can be restricted to specific APIs and IP ranges in Google Cloud Console — always restrict in production.