Writing to an object in a streaming fashion is a typical use case and since Jsonista aims for performance, supporting that is rather expected. As opposed to using write-value-as-string or write-value-as-bytes and then copying the result to an object like a writer.

Currently, this is not possible since write-value closes the given object, hence an exception is thrown. Or maybe is it Jackson itself?

I realized this while trying to write a line-delimited JSON file.

(with-open [out (clojure.java.io/writer "/tmp/foo.json")]
    (json/write-value out [:a])
    (.write out (int \newline))
    (json/write-value out [:b]))