HTTP Bearer Token (Authorization Header) Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching http bearer token (authorization header), 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

// HTTP Bearer Token (Authorization Header)
// ReDoS-safe | RegexVault — Web & Network > HTTP

const httpBearerTokenAuthorizationHeaderRegex = /^Bearer [A-Za-z0-9\-._~+\/]+=*$/;

function validateHttpBearerTokenAuthorizationHeader(input: string): boolean {
  return httpBearerTokenAuthorizationHeaderRegex.test(input);
}

// Example
console.log(validateHttpBearerTokenAuthorizationHeader("Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.dozjgNryP4J3jVmNHl0w5N_XgL0n3I9PlFUP0THsR8U")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > HTTP 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

Bearer tokens should be treated as opaque strings by resource servers. Validate the token signature and claims with your JWT library, not by regex. Token must not contain spaces.