JS Formatter

JavaScript formatting has been largely standardized by Prettier, the opinionated code formatter adopted by most major open-source projects and development teams. Key formatting decisions include: semicolons (Prettier defaults to adding them; some teams prefer no-semicolons following ASI rules), quote style (single quotes are standard in most JavaScript projects, double quotes in JSX/HTML contexts, template literals for interpolation), trailing commas (trailing commas in arrays and objects improve git diffs and are standard in modern JavaScript), bracket spacing (spaces inside object braces { key: value } vs {key: value}), arrow function parentheses (parens around single parameters: (x) => x vs x => x), and indentation depth (2 spaces is the JavaScript community standard, contrasting with 4 spaces in Python and many backend languages). ESLint handles code quality rules (unused variables, missing error handling, unsafe patterns) while Prettier handles formatting — the two tools have distinct responsibilities that shouldn't overlap. The AllTools JavaScript Formatter applies standard formatting to JavaScript and TypeScript code in the browser using a parser that understands modern syntax including optional chaining, nullish coalescing, private class fields, and top-level await. Your code — which may contain proprietary business logic or sensitive algorithms — never leaves your device.

JavaScript formatting serves a critical debugging function when working with third-party or production code. Minified vendor libraries and production bundles compress all code onto minimal lines, making debugging nearly impossible without formatting. When a production error occurs and source maps are unavailable, unminifying the JavaScript is the first step toward understanding the error context and call stack. Browser DevTools can pretty-print JavaScript, but the AllTools formatter provides a standalone environment for formatting, comparing, and analyzing code without DevTools limitations. Obfuscated scripts — where variable names are replaced with short identifiers and code structure is deliberately obscured — become partially readable after formatting, revealing control flow and function structure even when variable names remain cryptic. Security auditing of third-party scripts before including them in your application benefits from formatted analysis — reviewing what APIs a script calls, what data it accesses, and what network requests it makes is much easier in formatted code. Formatted code can then be compared using the Diff Checker against known versions to identify unauthorized modifications or injected code.