Getting "language" is not allowed error in JOI? - node.js

Question

I recently migrated to new joi repo (#hapi/joi => joi)
Now I am getting error when running server
throw new AssertError([result.error.details[0].message]);
^
Error: "language" is not allowed
I searched google and SO , but cant find solution
This is my code :
forgetUser: {
query: {
email: Joi.string().regex(/^(([^<>()[\]\\.,;:\s#\"]+(\.[^<>()[\]\\.,;:\s#\"]+)*)|(\".+\"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/)
.required()
.options({ language: { string: { regex: { base: 'must be valid' } } } })
.label('Email')
}
},
Please help me?

Answer 1

This is caused when you are passing an unknown field to a Joi schema.
for example, you have this Joi schema:
Joi.object({
name: Joi.string().required(),
email: Joi.string().required(),
});
and you pass this object to validate:
{
name: "John Doe",
email: "johndoe#gmail.com",
language: "en"
}
The validation will throw an error / failed because language is not allowed inside the schema.
To prevent this, you can pass stripUnknown options on the Joi Schema so it will strip unknown fields
Joi.object({
name: Joi.string().required(),
email: Joi.string().required(),
}).options({ stripUnknown: true });
or you can pass allowUnknown so it will ignore unknown fields
Joi.object({
name: Joi.string().required(),
email: Joi.string().required(),
}).options({ allowUnknown: true });
You can read more about validation options here

Answer 2

It is not clear from the question what you are trying to achieve (maybe add more details?).
If you are trying to validate email, there is already a built-in function to do so: string.email().
If you still want to do a custom regex matching, there is an built-in function for this too: string.pattern().
If you want to replace the built-in error messages to custom error messages, Joi provides that by using .messages(). Check the answer here: https://stackoverflow.com/a/58234246/1499476.
Basically, you can do something like:
forgetUser: {
query: {
email: Joi.string().pattern(/^(([^<>()[\]\\.,;:\s#\"]+(\.[^<>()[\]\\.,;:\s#\"]+)*)|(\".+\"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/)
.required()
.label('Email')
.messages({
'string.pattern.base': '{#label} must be valid', // --> Email must be valid.
'string.base': '{#label} should be a type of "text"',
... // other customisations
})
}
},
string.pattern() can also be used as alias string.regex() (as you are already doing).