JSON Tool

Java Formatter

Format Java source code with Prettier and prettier-plugin-java: classes, records, lambdas, generics and long call chains.

Runs in your browserJava → Java

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Example

Input

public class Hello{public static void main(String[] args){System.out.println("Hi");}}

Output

public class Hello {

    public static void main(String[] args) {
        System.out.println("Hi");
    }
}

How to use the Java Formatter

Paste a complete compilation unit (a class, interface, enum or record), or load a .java file.
The output follows the prettier-java style, which adds a blank line before the first class member.

Privacy and limitations

Your data is processed on your device and is not uploaded to any server.
The input must be syntactically valid Java; code fragments such as a lone statement or method cannot be formatted.
Syntax errors are reported without a line number because the parser does not expose one.
The style is fixed to prettier-java conventions; only indentation and print width are configurable.

Frequently asked questions

Is my code uploaded?

No. The parser is a WebAssembly module that runs in your browser; it is downloaded the first time you format.

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