I have to interact with an existing TCP/IP server which transfers binary data structures corresponding to c-struct.

One example struct is encoded as

struct DATSETTING{      /* MCS data settings */
  int32_t savedata;     // bit 0: auto save after stop
                        // bit 1: write listfile
                        // bit 2: listfile only, no evaluation
  int32_t autoinc;      // 1 if auto increment filename
  int32_t fmt;          // format type (seperate spectra): 
                        // 0 == ASCII, 1 == binary,
                        // 2 == CSV
  int32_t mpafmt;       // format used in mpa datafiles 
  int32_t sephead;      // seperate Header 
  int32_t smpts;
  int32_t caluse;
  char filename[256];
  char specfile[256];
  char command[256];
};

I have been using AJAX calls through PHP to run external c-software on the server side to communicate with the TCP/IP server, process this information, and display it on a web page. However, I would like to transition to Node.js on the server side and only use JavaScript to make the entire project a little more tidy. However, I cannot figure out how to process such a data structure using JavaScript. Is there some package available to automagically convert it to JSON? Or is there some other standard technique for dealing with this?

Modifying the TCP/IP server is out of the question, as it is part of a commercial system and I do not have access to the source code for it