Feature request: JSON error offset in ValidationError

[juliaogris]

It would be amazing to be able to give feedback to the enduser where their JSON input failed to validate against the schema, so I guess an Offset field similiar to the field in json.SyntaxError would be great.

[santhosh-tekuri]

during validation, we get the json-path at which validation has failed.

computing offset for given json-path is not trivial.

also we support validation given map:
func (s *Schema) ValidateInterface(doc interface{}) (err error)
in this case offset field does not make sense

[santhosh-tekuri]

WON'T FIX

json parser in std library does not provide offset for json tokens.
so it is not trivial supporting this