Use Werkzeug's JSON mixin

[davidism]

pallets/werkzeug#1445 moved Flask's JSONMixin to Werkzeug. Flask should now use Werkzeug's version, with some overrides. Will need to bump minimum Werkzeug version.

[PyDever]

Why are you wanting to use that API instead of using the default standard library JSON parsing mechanism.

[jamespic]

@PyDever The standard library json module didn't handle binary data (i.e, the data that comes into Flask over the network) properly until Python 3.6, so some additional handling is required for that. You also have issues with CSRF if you use the standard library json code naïvely.

[seawolf42]

starting to work on this

EDITED: being worked on by @EtiennePelletier