For example, this is a popular style in JavaScript: myPromiseĪ naive printer would collapse it into something like this: myPromise. We make sure to tailor code to specific patterns. HTML-html-whitespace-sensitivity -vue-indent-script-and-style Special. Common-single-quote-no-bracket-spacing-prose-wrap -bracket-same-line-single-attribute-per-line JavaScript-no-semi-jsx-single-quote-quote-props -arrow-parens -trailing-comma. The output is already very good, and I'm sure there are more tweaks we can make to make everyone happy. Global-parser -print-width -tab-width -use-tabs-embedded-language-formatting. Respecting PatternsĪ lot of work has been put into making prettier actually viable. Prettier bans all custom styling by parsing it away and re-printing the parsed AST with its own rules that take the maximum line width into account, wrapping code when necessary. The most strict linter I know happily lets all these styles happen: foo(, You can format a part of your document by selecting the text you want to format, opening the command palette, and selecting 'Format Selection'. Then search for and select 'Format Document'. It "measures" code and will break it across lines if it cross the maximum line width.Įven if we disregard line widths, it's too easy to sneak in various styles of code in all other linters. Open the command palette using Cmd+Shift+P on Mac or Ctrl+Shift+P on Windows and Linux. Wadler's algorithm described in the paper is a simple constraint-based layout system for code. Individuals on teams will all format these differently according to their own rules and we lose the consistency we sought after. The fact that current style tools ignore this means they can't really help with the situations that are actually the most troublesome. This clearly shows that the maximum line length has a direct impact on the style of code we desire. What you would probably do is this instead: foo( Suddenly our previous format for calling function breaks down because this is too long. However, we've all run into this situation: foo(reallyLongArg(), omgSoManyParameters(), IShouldRefactorThis(), isThereSeriouslyAnotherOne()) That looks like the right way to format it. The maximum line length is a critical piece the formatter needs for laying out and wrapping code.įor example, take the following code: foo(arg1, arg2, arg3) Sure, you can tell eslint to warn you when you have a line that's too long, but that's an after-thought (eslint never knows how to fix it). Step 1: Paste your JavaScript code inside the input box (top side). There's an extremely important piece missing from existing styling tools: the maximum line length. Why did I choose this algorithm? First lets look at why none of the existing style tools really work. I didn't want to start from scratch, so it's a fork of recast's printer with the internals rewritten to use Wadler's algorithm from " A prettier printer". So I set out to make this work, and prettier was born. If computers are good at anything, they are good at parsing code and analyzing it. Online JavaScript beautifier (v1.14.7) Beautify JavaScript, JSON, React. I realized this would not only solve my JSX problem, but provide a tool for enforcing consistent styles across teams no matter what editor is used. It removes all the distractions of writing code you can write it however you like and instantly format it correctly. But this doesn't work with JSX, and when I looked around at other editors, I found similar problems (other editors are generally worse at forcing correct indentation).Īround the same time I had been using Reason which provides a refmt tool which automatically formats code. Emacs has great support for automatically indenting code I never manually indent anything. Over a month ago I wanted to try it out, and I realized one of the things holding me back was poor JSX support in Emacs. Many of you know that I usually don't use JSX when writing React code. Pretty Print Javascript works well on Windows, MAC, Linux, Chrome, Firefox, Edge, and Safari.(The above demo is running with prettier version ).Prettier JS is alternative of Notepad++ / VSCode / Sublime to Javascript pretty print.Users can also Javascript pretty print the Javascript file by uploading the file.Click on the URL button, Enter URL and Submit. Use your Javascript REST URL to Pretty Javascript and Print Javascript. This tool allows loading the Javascript URL to minify.It also validates in case the data is not valid Javascript before Pretty Javascript.It helps to Pretty Javascript, Print Javascript and Clear Javascript View data.What can you do with Prettier Javascript? Javascript Pretty Print Online is easy to use tool to pretty print Javascript String.
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