cant decode token and retrieve username

[sensorario]

As reported here:

https://stackoverflow.com/questions/49831398/retrieve-username-from-jwt-token-using-fastify

I am able to create a jwt token:

fastify.post('/signup', (req, reply) => {
  const token = fastify.jwt.sign({
    payload,
  })
  reply.send({ token })
})

that can return something like:

{"token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE1MjM3MDgyMzF9.HZqqiL7wwPaEQihUGoF7Y42Ia67HgKJ-1Ms38Nvcsmw"}

but if I try to decode the username frmo token

fastify.get('/decode', async (request, reply) => {
  const auth = request.headers.authorization;
  const token = auth.split(' ')[1]
  fastify.jwt.verify(token, (err, decoded) => {
    if (err) fastify.log.error(err)
    fastify.log.info('username : ' + decoded.username)
    reply.send({
      foo: decoded,
    })
  })
})

the response is:

{"foo":{"iat":1523660987}}

[delvedor]

Can you upload a full example that reproduces the issue?

[sensorario]

No sorry. But I'd found the solution (or the problem) ^_^. In /signup endpoint I've sent {payload:{username:"foo"}}.

In the wrong code fastify.log.info('username : ' + decoded.username) I've fixed with fastify.log.info('username : ' + decoded.payload.username)