Babel Formatter: Format JavaScript and JSX Code Online
Babel Formatter formats modern JavaScript (ES2015+) and JSX with Prettier’s Babel parser, including Flow types and experimental syntax. Paste or drop Babel code, choose indentation and the available formatting options, then copy the formatted output. It creates consistently formatted code for reviews and diffs, and can help identify input that does not parse, including its exact line.
Babel Formatter is a browser-based JavaScript formatter for modern JavaScript (ES2015+) and JSX. It uses Prettier with the Babel parser, including support for Flow types and experimental syntax. Use it to turn pasted or dropped Babel code into consistently formatted source that is easier to read, review, and share.
To use it, provide Babel input, choose the indentation and formatting options, and copy the result. The tool formats the code with Prettier; it is not a converter from JavaScript into a different data format. If the input does not parse, the formatter can help confirm that and identify the exact line where parsing fails.
The input and output remain modern JavaScript or JSX: the difference is how the source is laid out, not what format it represents. Consistent indentation and formatting make generated or unfamiliar code easier to inspect, support code review, and reduce whitespace-only noise in diffs. Formatting a snippet before sharing can also make its structure clearer.
Babel Formatter runs entirely in your browser, so your code is processed on your device and is not uploaded, stored, or sent to a server. It works offline once the page has loaded, which is useful when a network connection is unavailable. The formatter is free and helps developers and DevOps engineers review JavaScript, JSX, Flow-typed code, and experimental syntax in the browser.
Step 1: Paste or drop your Babel code into the formatter. It accepts modern JavaScript (ES2015+) and JSX.
Step 2: Choose the indentation and formatting options you need. These settings help shape the formatted output.
Step 3: Review the formatted result. The tool uses Prettier with the Babel parser and supports Flow types and experimental syntax.
Step 4: Copy the output for your code review, commit, bug report, or other development task.
Use case: Make an unreadable, machine-generated Babel file easier to review before you commit it by formatting its code consistently.
Use case: Format a Babel document you did not write to make its indentation and layout easier to compare with your project requirements.
Use case: Reduce whitespace noise in a diff by producing consistently indented output, so code changes are easier to spot.
Use case: Format a snippet before pasting it into a bug report or code review, making its structure easier for others to read.
Use case: Check whether Babel input parses and find the exact line where parsing fails, helping you investigate a syntax issue.
Use case: Clean up a JSX snippet before sharing it with teammates or using it in a review.
Use case: Format code that includes Flow types or experimental syntax with a tool that supports those constructs.