JavaScript Beautifier: Format and Clean Up JavaScript
JavaScript Beautifier formats JavaScript with Prettier so code is easier to read, review, and share. Paste your source, then configure indentation, print width, semicolons, quote style, and trailing commas. The tool returns formatted JavaScript, and if the input has an error, it reports the position to help you locate the problem.
JavaScript Beautifier is an online JavaScript formatter that uses Prettier to make JavaScript source easier to scan and review. Paste code into the browser-based tool to get formatted output without manually adjusting whitespace. It is useful when you need to beautify JavaScript online before sharing a snippet, reviewing a change, or working with generated code.
During formatting, you can configure indentation and print width, along with whether the output uses semicolons, which quote style to use, and how trailing commas are handled. These settings let you adjust the formatted output to suit a particular review or coding convention. If the JavaScript input contains an error, the tool reports its position so you can locate and inspect the issue.
JavaScript is executable source code, and formatting changes its layout rather than translating it into another data format. A consistent layout can make code easier to read, compare, and discuss; it can also reduce whitespace-only noise in diffs. Use this formatter when you want more readable JavaScript, and adjust the available options to change how the output is presented.
Processing happens entirely in your browser, and your input is not sent to a server. No signup is required, and after the page has loaded the tool can work offline. This makes it practical for developers and DevOps engineers who want a quick way to format code in the browser, from a machine-generated file to a snippet prepared for a bug report or code review.
Step 1: Paste or drop your JavaScript into the tool. It accepts JavaScript content and formats it with Prettier.
Step 2: Choose the indentation and formatting options you want. You can configure print width, semicolons, quotes, and trailing commas.
Step 3: Review the formatted JavaScript output. If the input contains an error, the tool reports its position to help you find the issue.
Step 4: Copy the formatted output for your code review, bug report, or other development task.
Use case: Make an unreadable, machine-generated JavaScript file easier to review before you commit it.
Use case: Check JavaScript you did not write against the formatting style you need to follow by adjusting the available options.
Use case: Create consistently indented output so a diff is easier to read and contains less whitespace noise.
Use case: Format a JavaScript snippet before adding it to a bug report or code review.
Use case: Check whether JavaScript input parses cleanly and use the reported error position to locate a problem.
Use case: Prepare a JavaScript example for sharing by making its layout easier for other developers to scan.
Use case: Apply consistent formatting to code during a review so teammates can focus on meaningful changes.