These days, when it comes to writing code, AI really is getting more and more capable. You tell it "help me write a debounce function," and it spits one out in three seconds, complete with comments and test cases. You tell it "refactor this component into hooks," and it can sort that out for you too. Sometimes you even feel like your typing speed can't keep up with its generation speed.
But here's something really interesting—no matter how beautiful the AI-generated code is, as long as it's JS code written by a human, written by a machine, or mixed together by both, it ultimately can't escape one step: formatting.
You might think, what's the big deal? Doesn't the editor have built-in formatting? In VS Code, just press Shift+Alt+F, run Prettier, and you're done, right? Yes, for everyday development that's indeed enough. But here's the problem—when you pull a piece of code from the internet that's compressed into something like gibberish, or inherit the "ancestral poop mountain" left by a former colleague, or drag a min.js down from some CDN because you want to see what it actually does, that's when you realize ordinary formatting just doesn't cut it.
I ran into this exact situation a while back. An old project needed an urgent bug fix, but the source code had long since been lost, and all that was left on the server was a compressed JS file. What to do? Grit your teeth and read it. The code looked like this: function a(b,c){return b+c}var d=function(e){return e2}—the variable names were all abcdefg, the functions were nested like Russian dolls, and line breaks? Nonexistent. The entire piece of code was one line, and dragging the scrollbar to the right could give you hand cramps.
That's when you need dedicated JS formatting and compression tools.
Let's start with formatting. A good formatting tool doesn't just add line breaks and indentation for you; it has to intelligently recognize code structure. For example, when it encounters if(a){b()}else{c()}, it needs to know how to split it into multiple lines in a way that fits reading habits. When it encounters nested ternary expressions, it has to judge when to break lines and when keeping one line is clearer. There are also object literals, arrays, and function parameters—the formatting rules in these places are all different, and even a slight difference makes it uncomfortable to look at.
I've tried quite a few online tools. Some just crudely break lines at semicolons, and as a result turn `for(var i=0;i