JSON to Properties - Generate Java Config Files

Convert JSON to Java .properties format instantly. Perfect for Spring Boot configs, Maven properties, and Java applications. Browser-based, private, no uploads.

JSON Input

Properties Output

Sort keys alphabetically

Include timestamp header

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Frequently Asked Questions

Properties files are used extensively in Java applications for configuration. Common uses include Spring Boot application.properties, Maven settings, Log4j configs, and any Java application needing key-value configuration storage.

Spring Boot reads application.properties files for configuration. This tool converts JSON configs to the exact format Spring Boot expects, with nested objects using dot notation (server.port=8080, spring.datasource.url=jdbc:mysql://localhost/db).

Nested JSON objects are flattened using dot notation. For example, {server: {port: 8080, host: 'localhost'}} becomes server.port=8080 and server.host=localhost. This matches standard Java properties conventions.

Arrays use indexed keys. For example, {items: ['one', 'two', 'three']} becomes items.0=one, items.1=two, items.2=three. This format is compatible with Spring Boot array binding.

The properties format requires escaping for backslashes (\), colons (:), equals (=), newlines (\n), tabs (\t), and Unicode characters. Leading spaces are also escaped to preserve exact values.

Yes. Non-ASCII Unicode characters are automatically converted to \uXXXX escape sequences, ensuring compatibility with standard Java properties file encoding (ISO-8859-1 with Unicode escapes).

JSON doesn't contain comments, so the converter cannot automatically generate them. However, the output .properties file can be manually edited to add # comment lines after conversion.

The output uses ISO-8859-1 encoding (standard for .properties files) with Unicode escape sequences for special characters. This ensures compatibility with all Java versions and tools like ResourceBundle.

Yes. Enable 'Sort keys alphabetically' to organize properties in alphabetical order. This makes the file more readable and easier to maintain, especially for large configuration files.

The output follows Java Properties specification exactly. Test by loading with new Properties().load(new FileInputStream('file.properties')) or placing in src/main/resources/ for Spring Boot auto-loading.

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