Exception when decoding a JWT with an invalid JSON payload

[santiagoaguiar]

Given auth0/node-jws#23 , when passing an invalid JWT like:
eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.yJ1c2VybmFtZSI6InNhZ3VpYXIiLCJpYXQiOjE0NzEwMTg2MzUsImV4cCI6MTQ3MzYxMDYzNX0.foo

This line:
https://github.com/auth0/express-jwt/blob/master/lib/index.js#L86

Throws an exception, which can't be handled as described on the doc by using err.name === 'UnauthorizedError' as given on the docs. I understand the (imo) bug is actually on jws, but maybe it's possible to try/catch decode and handle it as a token that failed verification.

[jfromaniello]

Fixed in v5.1.0