Learn every JavaScript number formatting method you actually need — toFixed, toPrecision, toLocaleString, Intl.NumberFormat, Math utilities and the traps to avoid. Numbers are everywhere in web apps — prices, scores, statistics, percentages, progress bars. But JavaScript stores all numbers as 64-bit floating point values, and raw floating point results look terrible to users. This is what I mean: console . log ( 0.1 + 0.2 ); // 0.30000000000000004 Enter fullscreen mode Exit fullscreen mode That is not a bug. That is how binary floating point math works. The fix is not to change how JavaScript stores numbers — it is to control how you display them. That is what number formatting is. By the end of this article you will know every method you need, when to use each one, and the traps that trip up beginners. What Is Number Formatting? Number formatting is the process of converting a raw numeric value into a string that is readable, consistent, and appropriate for your audience.…