if (!options.algorithms) throw new Error('algorithms should be set'); Error: algorithms should be set

You should add algorithms property to the jwt constructor.

Example;

expressJwt({ secret:  process.env.JWT_SECRET, algorithms: ['RS256'] });

The issue caused by changes in version 6.0.0. Documentation also has been updated recently, it says:

The algorithms parameter is required to prevent potential downgrade attacks when providing third party libraries as secrets.

So now specifying algorithm property is mandatory, like so:

expressJwt({
  secret: 'secret',
  algorithms: ['HS256']
})

if the above algorithm : ['RS256'] does not work try this, algorithms: ['HS256']

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