As pointed out by @KrisJelbring in WEB-12, there is currently no official API endpoint for looking up user profiles (i.e. uuid, name, textures, skin model, …).
This can only be done via the sessionserver and involves decoding JSON and Base64 which again includes JSON data. This data is not available via the official api.mojang.com endpoints.
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@nighter could you explain why this is closed as "invalid"? @KrisJelbring agreed that people would benefit from this. Or am I missing something and there is an official API endpoint for user profiles?