As a final thing in the serialization work I picked up, I think we need untyped GraphSON 3.0 to go along with 1.0 and 2.0 so basically:
application/vnd.gremlin-v3.0+json;types=false I think it follows 1.0 untyped more closely than 2.0 untyped because 1.0 was much easier to consume. The basic premise here will be to follow 1.0 format: https://tinkerpop.apache.org/docs/3.6.4/dev/io/#graphson-1d0 with a few changes/additions: 1. allow for multi-label on vertices as more graphs are allowing that these days. 2. use our "~" prefix for any structural/reserved keys like T.label or T.id for example 3. possibly get the Tree right (though we dont even have that for typed GraphSON 3.0 - maybe something like: { "node": {}, "children": [{ "node": {}, "children": [] }, { "node": {}, "children": [] }, { "node": {}, "children": [{ "node": {}, "children": [] }] }] } please let me know if there's anything else to include.