# JSX Formatter

Format React components and other JSX with this JSX Formatter. Paste your code and the tool parses it as a JavaScript module with JSX, prints the JavaScript with two space indentation and semicolons, and lays out multi-line JSX elements with nested tags on their own lines inside parentheses. Syntax errors are reported, so React developers get readable components back for reviews, debugging and documentation.

## Frequently asked questions

### How does the JSX Formatter work?

It first parses the code as a JavaScript module with JSX enabled and prints it in a consistent style. JSX elements are then laid out with the same rules as the HTML Formatter, so nested block tags get their own indented lines.

### How are multi-line JSX elements written?

When an element contains block level children such as div, section, p, ul or h1, each child goes on its own line and the whole element is wrapped in parentheses. Elements that fit on one line, such as a single component tag, stay inline.

### Are fragments and self-closing components supported?

Yes, fragments written as <> and </> and self-closing components such as <Item key={1}/> are parsed and kept. Their attributes and expressions inside curly braces are copied as written.

### What happens with syntax errors?

The parser stops and the tool shows its message, for example an unexpected token, instead of returning half formatted code. Correct the reported spot and format again.

### What style does the JavaScript part use?

Blocks get two space indentation, one statement per line, spaces around operators and semicolons at the end of statements. There are no options to change the style.

### Are comments preserved?

Yes, line and block comments in the JavaScript are kept. Comments inside JSX expressions stay inside their curly braces.

### Does it support TypeScript in TSX files?

No, type annotations are not part of the JSX grammar this tool parses, so TSX with types is rejected as a syntax error. Use the TypeScript Formatter for typed code.

### Will formatting change how my component renders?

The JavaScript is only reprinted, and the JSX layout changes whitespace between block elements, which React ignores when it sits on separate lines. Check inline text next to tags if exact spacing matters.

### Why is the output fenced as javascript?

JSX is an extension of JavaScript, so the result is returned as a Markdown code block marked javascript. Copy the lines between the fences for your .jsx file.

### How large can my component be?

Up to 5 MB of code per run, and larger input is rejected with a message. The output is the same as the JSX option of the Code Formatter.

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