[Question, Documentation request] Spring Boot 3.4.2 supports application.yaml in JSON format

[Volodymyr-Maiboroda-Imprivata]

Accidentally, I found out that after upgrading Spring Boot from 3.1.1 to 3.4.2, it seems like I can place a JSON in the application.yaml file. For example:

  "service": {
    "name": "example-service"
  },
  "server": {
    "port": 8080,
    "shutdown": "graceful"
  },

It works. I didn't find this in any of the adoption guidelines, so I want to double-check if this is an expected feature or is something that will be changed in the future.

[quaff]

YAML is a superset of JSON, then a YAML parser can understand JSON, do you mean it's not supported before the upgrading？

[Volodymyr-Maiboroda-Imprivata]

@quaff, Thanks for the response. I did more tests, and it does support it in 3.1.1 if I specify the correct JSON in the configuration. But is this mentioned somewhere in the documentation? We will build functionality around this possibility, and it would be great if this behavior were expected and supported in the future.

[bclozel]

Thanks for reaching out.
We do support the YAML format and we're bound to the supported YAML spec and the parser we are using. I don't think we will mention JSON in the docs are this is not an intended feature.