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Joi is an object schema description language.
If a customized validation operate is defined via schema or status then options can an arbitrary object that can be handed to this perform as the second argument. A lifecycle technique with signature async function(request, h, err) the place request is the request object, h is the response toolkit and err is the validation error.
Keys may also be both a validation operate using the signature async perform(value, options) or a joi validation object for its properties. You may also cross a custom operate with the signature async function (value, choices) where worth is the information to be validated and options is the validation choices as defined on the server object.
Joi permits you to create blueprints or schemas for JavaScript objects to ensure validation of key information. If a key has a value of true, there can be no validation. This can be a route that can return a listing of books. Note that joi schema objects are immutable which suggests every additional rule added (e.g.
.min(5)) will return a brand new schema object. Another manner of using validate is to get its return values.

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