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An order ID goes up by one in a URL and a stranger's data appears, because nobody checked whether the caller was allowed to see it. Most real API breaches come from a short list of ordinary mistakes like this one: a token decoded but never verified, a request body copied straight onto a database record, a login endpoint with no limit on attempts, one all-powerful key in a config file. This book pairs each mistake with its fix, in Python and Node.js code you can read in a minute. You'll pick the right OAuth2 flow, close the five mistakes that break most JWT setups, choose between roles and attributes, fix broken object-level authorization, and run a one-page security audit before anything ships. No compliance theater.
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