JavaScript Formatter

This is a lightweight re-indenter, not a real parser. It walks your code one character at a time and applies a few fixed rules: it adds a newline and increases indentation after every opening brace or bracket, decreases indentation before a closing one, breaks the line after every semicolon, and breaks after a comma only when the previous character was a closing brace or bracket (the gap between object or array elements). Indentation is hard-coded to two spaces and cannot be changed, and braces and square brackets are treated identically. Because it has no tokenizer, it cannot tell code from text. Any brace, bracket, semicolon, or comma that lives inside a string, template literal, regular expression, or comment is treated as structural, so a line like const s = 'a;b' will wrongly split at the semicolon inside the string. It also only breaks at literal semicolons, so it does not honor automatic semicolon insertion: semicolon-free code stays on one line. Treat it as a quick visual aid for eyeballing minified or one-line snippets, not as a correctness-preserving tool. For real reformatting that understands syntax, keeps comments, and never corrupts strings, use Prettier or your editor's built-in formatter.