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Why JavaScript Has Floating-Point Precision Issues (and How to Fix Them)
Have you ever written a perfectly reasonable line of JavaScript like 0.1 + 0.2 and gotten back 0.30000000000000004? It feels almost mocking—how can a language built for the modern web fail at such basic math? The truth is, JavaScript isn’t bad at math at all. It’s extremely precise. The surprise comes from what kind of math it’s doing. Under the hood, JavaScript uses the same binary floating-point system found in most programming languages and even tools like Excel. And that system, while powerful, was never designed to represent everyday decimal numbers cleanly.
Written byAria Singh
Published onJanuary 23, 2026
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