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By JSON validation do you mean just checking if it's well formed or rather something like JSON Schema validation?

The latter seems tricky. It's validation inside the application a bottleneck?

Yes, json validation against schema. Bigger picture, in future we're looking to do some upstream proxy redirects based on payload. Figured the first step is short-circuiting anyone not sending us valid json. Plus, back ends are written in a variety of languages -- not all of whom do json schema validation nicely.

I assume they mean JWT validation.

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