Is this a bug? "file" : "/home/anthony/projects/dcomposer/src/printui.d", A line from DMD 2.063 json output. "file" : "\/usr\/include\/d\/gsv\/SourceBuffer.d", A line from an older DMD version. Forward slashes escaped according to json standard. Hesitant to file a bug report because by the time I see something it's probably already well known and fixed.