s="keyword">val</span> write_json_trace_item : <span><span class="xref-unresolved">Stdlib</span>.Buffer.t <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-json_trace_item">json_trace_item</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p>Output a JSON value of type <a href="#type-json_trace_item"><code>json_trace_item</code></a>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-string_of_json_trace_item"><a href="#v