Java-Eigenschaften-Datei-Formatter

Java-Eigenschaften-Datei-Formatter

This tool formats Java .properties files using the same rules the JDK uses to load them. It accepts =, :, or whitespace as a separator, recognises both # und ! comment styles, and joins backslash continuation lines into clean single-line key/value pairs. Use it on application.properties, logback.properties, ResourceBundle messages_*.properties, or any plain Java config you need to tidy up.

Nutzung

1. Paste your raw .properties content into the input box (or click Probieren Sie ein Beispiel aus).
2. Pick a separator style: =, :, or preserve whatever the original line used.
3. Choose spacing around the separator and a comment style (#, !, or preserve).
4. Toggle options to sort keys, drop duplicates (keeping the last occurrence), align keys to a common width, trim trailing whitespace, or collapse repeated blank lines.
5. Copy the formatted output, or download it as a .properties file. The validation panel flags duplicate keys and malformed \uXXXX escapes.

Funktionen

• Spec-correct parsing – handles =, :, whitespace separators, and backslash line continuations the same way java.util.Properties does.
• Comment style normalization – convert all comments to # oder !, or preserve each line’s original prefix.
• Sort and dedupe – alphabetise keys and drop earlier duplicates so the last occurrence wins (matching JVM load order).
• Key alignment – pad keys to equal width for visually clean diffs and reviews.
• Whitespace cleanup – trim trailing whitespace and collapse runs of blank lines.
• Validierung – warns on duplicate keys and reports invalid \uXXXX unicode escapes.
• Live updates – output and validation refresh as you type or change options.