Prettier Playground

Format JavaScript, TypeScript, CSS, JSON, HTML, and Markdown with Prettier right in your browser, and tweak Prettier options live.


    

  

  

    
    
    
  

  


    

    

      
The Prettier Playground is a free, in-browser version of Prettier — the popular opinionated code formatter. Paste JavaScript, TypeScript, CSS, SCSS, LESS, JSON, HTML, or Markdown, pick a language, and instantly get Prettier-formatted output. Tweak Prettier options like print width, tab width, semicolons, single quotes, trailing commas, and bracket spacing and watch the result update live. It runs the real Prettier engine entirely on your device, so your code never leaves your browser.

      

        
What is the Prettier Playground?

        
Prettier is an opinionated code formatter that rewrites your code into a single, consistent style, so you stop arguing about formatting. This playground bundles the official Prettier formatter and its language parsers and runs them client-side. Unlike a generic beautifier, it produces Prettier's exact, recognizable output and exposes Prettier's own configuration options, mirroring the official prettier.io playground without any setup.

        
      

      

        
How to use the Prettier Playground

        
Formatting code with Prettier in your browser takes seconds:

        
  1. Choose the language that matches your code (JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, or Markdown).
  2. Paste or type your code into the input box.
  3. Adjust Prettier options — print width, tab width, semicolons, quotes, trailing commas, and bracket spacing.
  4. Read the formatted result on the right and copy it with one click.

      

      

        
Which Prettier options can I change?

        
You can control the options developers reach for most: printWidth (the line length Prettier tries to stay under), tabWidth, useTabs (tabs vs spaces), semi (whether to add semicolons), singleQuote (single vs double quotes), trailingComma (all, es5, or none), and bracketSpacing (spaces inside object braces). The output re-formats automatically whenever you change an option.

        
      

      

        
How is this different from a regular formatter?

        
General beautifiers re-indent code, but Prettier reprints it from scratch using its own rules, so the result is consistent no matter how the input was written. That means it normalizes quotes, wraps long lines at your print width, and applies Prettier-specific defaults that other formatters do not. If your team uses Prettier, this playground shows exactly what Prettier would produce.

        
      

      

        
Is my code uploaded anywhere?

        
No. The entire Prettier engine runs locally in your browser using WebAssembly-free JavaScript, so your source code is never sent to or stored on any server. You can safely format proprietary or sensitive code.

        
      

      

        
Why use this Prettier Playground?

        
  • 100% free with no ads, sign-up, or usage limits.
  • Runs the real Prettier formatter entirely in your browser — code is never uploaded.
  • Supports JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, and Markdown.
  • Live, editable Prettier options: print width, tab width, semicolons, quotes, trailing commas, and bracket spacing.
  • Produces Prettier's exact, opinionated output — the same as running Prettier locally.
  • Friendly error messages when your code has a syntax error.

      

      

        
Frequently asked questions

        

          
Is the Prettier Playground free?

          
Yes. Every tool on ToolsSoup is completely free, with no account, sign-up, or hidden limits.

        

        

          
Does it use the real Prettier?

          
Yes. It loads Prettier's official standalone build and language plugins and runs them in your browser, so the output matches what Prettier would produce locally.

        

        

          
Is my code safe?

          
Absolutely. All formatting happens locally in your browser, so your code is never sent to or stored on any server.

        

        

          
Which languages are supported?

          
JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, and Markdown. Pick the matching language from the selector and Prettier uses the right parser.

        

        

          
What happens if my code has a syntax error?

          
Prettier cannot format invalid code, so the playground shows a friendly message describing the problem instead of producing output.