{"id":111,"date":"2026-05-04T19:52:02","date_gmt":"2026-05-04T23:52:02","guid":{"rendered":"https:\/\/simpletool.io\/blog\/?p=111"},"modified":"2026-05-04T19:52:02","modified_gmt":"2026-05-04T23:52:02","slug":"javascript-formatter","status":"publish","type":"post","link":"https:\/\/simpletool.io\/blog\/javascript-formatter\/","title":{"rendered":"JavaScript Formatter: Beautify JS with Prettier [2026]"},"content":{"rendered":"
TL;DR:<\/strong> A JavaScript formatter (also called a beautifier) reformats messy or minified JS into consistently-indented, readable code. Our free JavaScript formatter<\/a> runs Prettier 3<\/strong> in your browser \u2014 the same engine 80%+ of professional JS teams ship \u2014 with full TypeScript and JSX support, configurable print width, semis, and quote style. No upload, paste any size.<\/div>\n

Inconsistent formatting is the silent productivity tax of every codebase. Two engineers who disagree about semicolons or trailing commas will spend more time arguing about diffs than fixing bugs. The industry settled this argument in 2017 when Prettier<\/strong> shipped: pick a config once, run the formatter on save, and the rest is mechanical. By 2026, Prettier is the default formatter in VS Code, the default in Next.js \/ Remix \/ Vite scaffolds, and a hard requirement on most engineering teams.<\/p>\n

Our JavaScript formatter<\/a> runs Prettier 3 in your browser via WebAssembly. It handles JavaScript (ES2024), TypeScript, JSX, TSX, JSON, and Markdown code blocks. Use it to beautify a one-liner you copied from a build output, to reformat code from a tutorial that uses different indentation than your project, or to apply Prettier without installing anything. This guide covers every option, the differences vs Beautify.js, and when to use a formatter vs a minifier.<\/p>\n

Prettier options that matter (and the defaults to start with)<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Option<\/th>\nDefault<\/th>\nWhen to change<\/th>\n<\/tr>\n<\/thead>\n
printWidth<\/code><\/td>\n80<\/td>\n100 or 120 if your team uses wide monitors<\/td>\n<\/tr>\n
tabWidth<\/code><\/td>\n2<\/td>\n4 only if you write Java\/C# style or for accessibility<\/td>\n<\/tr>\n
useTabs<\/code><\/td>\nfalse<\/td>\ntrue for accessibility (screen readers can adjust width)<\/td>\n<\/tr>\n
semi<\/code><\/td>\ntrue<\/td>\nfalse if your team writes Standard JS \/ no-semi style<\/td>\n<\/tr>\n
singleQuote<\/code><\/td>\nfalse<\/td>\ntrue for most codebases (preferred by Airbnb \/ Standard)<\/td>\n<\/tr>\n
trailingComma<\/code><\/td>\n“all”<\/td>\n“es5” if targeting old browsers (rare in 2026)<\/td>\n<\/tr>\n
bracketSpacing<\/code><\/td>\ntrue<\/td>\nfalse to compress (against the Prettier philosophy)<\/td>\n<\/tr>\n
arrowParens<\/code><\/td>\n“always”<\/td>\n“avoid” if your style guide forbids parens around single arrow args<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The defaults are deliberately opinionated. Prettier’s design philosophy is “you don’t get to choose 30 micro-options” \u2014 pick a print width and a quote style and stop bikeshedding. Most teams adjust at most 3 fields.<\/p>\n

Prettier vs Beautify.js vs ESLint –fix<\/h2>\n