4 Tools
Security & Validation Tools
Application security requires proper validation and key management. Our security tools help you validate credit card numbers using the Luhn algorithm, generate cryptographically secure API keys and tokens with configurable formats, build JWT tokens from scratch with custom header, payload, and signature options, generate cryptographically secure random numbers with full range control, and parse URLs for security analysis. These tools follow security best practices — all operations are client-side using the Web Crypto API when cryptographic operations are needed.
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Frequently Asked Questions
What is the Luhn algorithm?
The Luhn algorithm (mod 10 algorithm) is a simple checksum formula used to validate identification numbers, most notably credit card numbers. It detects single-digit errors and most adjacent digit transpositions. Our Credit Card Validator uses this algorithm to verify if a card number is structurally valid — it does not check whether the card is active or has available funds.
How are API keys generated?
API keys are generated using cryptographically secure random number generation (window.crypto.getRandomValues). Each key is composed of random characters from a configurable character set with a minimum length of 32 characters, providing high entropy that makes guessing computationally infeasible.
What parameters can I set in the JWT Builder?
The JWT Builder lets you set the signing algorithm (HS256, HS384, HS512), custom header parameters (kid, typ, cty), standard claims (iss, sub, aud, exp, nbf, iat, jti), and custom payload claims. You can also paste a secret key for HMAC signing. The builder produces a complete JWT string ready for use in API testing or authentication flows.