There is an RC1 Technical Proposal and a User Guide from 2016 on the topic of JSON encoding, but did this ever get adopted as part of the standard?
Not sure about the status of the FIX-JSON spec specifically, but we are using Orchestra to help de/serialise multiple encodings including a general-purpose JSON encoding. This is quite useful for analytics and post-trade processing.
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Encoding FIX using JSON is part of the FIX Technical Standards but has remained in a Release Candidate stage due to a lack of interest from the community to move this forward to a final Version 1.0. Please see here for details regarding the FIX process for Technical Standards.
FIX would certainly welcome renewed interest and establish a FIX Working Group underneath the GTC Subcommittee FIX Standards to facilitate this. FIX can issue a call for participation if there is a small group coming forward to join such an initiative.
Happy to hear from @martinat that Orchestra is fit-for-purpose to support JSON encodings.
Hanno Klein
FIX Technical Director
Thank you.