我有这样的JWT令牌
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ
我如何解码这个,以便我可以像这样得到有效载荷
{"sub":"1234567890","name":"John Doe","admin":true}
json jwt swift swift3
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