JavaScriptHow to validate a CPF with JavaScript
Learn how to validate a CPF with plain JavaScript, calculate the check digits, handle formatting and reject invalid sequences in forms, with working code.
Related tool: CPF ValidatorArticles about Tools
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JavaScriptHow to validate a credit card with JavaScript (Luhn algorithm)Learn how to validate a credit card number with JavaScript using the Luhn algorithm. A hands-on example, ready-to-use code and what Luhn does not check.
Related tool: Credit Card Validator
ToolsI Built a Free Web Tools Hub for DevelopersI created a free web tools hub for developers: CPF generator, validators, Planning Poker and more daily utilities, in Portuguese and English, with no sign-up.