包含多个 json 值的响应是否总是必须包装在 java 中的数组中？

Question

I am trying to return a response from the back end using java where the response is a list of json values.

Is it possible to return the data in this format?

{"someKey": someValue},
{"someKey2": someValue},
{"someKey2": someValue}

I noticed that json values are always returned wrapped in an array like this

[
{"someKey": someValue},
{"someKey2": someValue},
{"someKey2": someValue}
]

I was asked to return the json data without being in an array and I am having trouble doing that. Is it even possible to return a list of json objects without being wrapped in an array? This is in java using the ObjectMapper class

Answer 1

List of json objects not wrapped in an array [] is a invalid json format and will give you error: multiple JSON root elements

Possibly you can modify the result to this JSON format?

{
    "somekey": somevalue,
    "someKey2": someValue,
    "someKey3": someValue,
}

Answer 2

As others have pointed out, a list of objects without the wrapping array.would be invalid JSON.

However, if you really must return that, you could arrange to get the JSON as a String, and then use String methods, of your choice (eg substring) to remove the square braces, and then return that. Ultimately, a JSON is a String.