Add API parameter to control configuration file format (properties vs yaml)

[jkeresman01]

Summary

Spring Initializr always generates application.properties. The UI appears to provide a configuration choice, but the API (to my knowledge) offers no parameter to switch between properties and yaml.

Expected behaviour

Add a request parameter, e.g.:

configuration=properties|yaml

• configuration=yaml -> generate application.yml
• Omitting the parameter or using properties -> generate application.properties (current behavior)

[mhalbritter]

There is a parameter, it's called configurationFileFormat.

This is for properties:

https://start.spring.io/starter.zip?type=maven-project&language=java&bootVersion=3.5.7&baseDir=demo&groupId=com.example&artifactId=demo&name=demo&description=Demo project for Spring Boot&packageName=com.example.demo&packaging=jar&javaVersion=25&configurationFileFormat=properties

and this is for YAML:

https://start.spring.io/starter.zip?type=maven-project&language=java&bootVersion=3.5.7&baseDir=demo&groupId=com.example&artifactId=demo&name=demo&description=Demo project for Spring Boot&packageName=com.example.demo&packaging=jar&javaVersion=25&configurationFileFormat=yaml

make sure to update the configuration of your initializr instance: #1682 (comment)

[jkeresman01]

Great, thank you.