Hapi Joi

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Joi tutorial shows how to validate values in JavaScript with Hapi Joi module.
Hapi Joi is an object schema description language and validator for JavaScript objects.
With Hapi Joi, we create blueprints or schemas for JavaScript objects (an object that stores information) to ensure validation of key information.
Hapi is a simple to use configuration-centric framework with built-in support for input validation, caching, authentication, and other essential facilities for building web and services applications.
We initiate the project and install Hapi Joi with nmp i @hapi/joi.
Validation is performed with the validate() function:
The value is the value being validated and the schema is the validation schema.
The options are validation options. The abortEarly option stops validation on the first error, otherwise returns all the errors found. It defaults to true. The convert option attempts to cast values to the required types. It also defaults to true.
The callback is the optional synchronous callback method using the signature function(err, value). If the validation failed, the err contains the error reason, otherwise it is null. The value is the value with any type conversions and other modifiers applied.
In the first example, we print the version of Hapi Joi.
The version of Joi is stored in Joi.version.
In the following example, we perform the validation inside the synchronous function.
We have two values to validate: username and email.
This is the validation schema. The username must be a string and it is required. The email must be a valid email address and it is also required.
The Joi.validate() validates the data with the provided schema.
In the next example, we don't use the synchronous function; we work with the returned values.
The example validates two values: username and date of birth.
Another way of using validate() is to get its return values.
Based on returned values, we either print the error details or the original values.
We have no errors, so the validated values are printed.
By default, Joi stops validation on first error. If we want to get all errors, we have to set the abortEarly option to true.
In the example, we print all errors that have occurred.
We set the abortEarly option to false.
Joi casts values by default; to disable casting, we set convert option to false.
In the example, we have two values automatically casted by Joi.
The string is casted to a number and the timestamp to an ISO string.
With Joi.number() we can validate numbers.
In the example, we validate three numbers.
The age value must be a number between 18-129. The price must be positive and the experience must be greater than five.
Since the price was negative, we get this error details.
With Joi.date(), we can validate dates.
The example validates three date values.
In the schema, we have rules to validate that a value is a timestamp, has ISO format, and is greater that a specified value.
All values were validated OK. Note that the values were automatically casted to the ISO format.
The arrays can be validate with array().
In the example, we validate an array of integers.
We validate that our array has at least two elements and at max ten elements.
Functions can be validated with func().
In the example, we validate a function.
We validate the function's arity (the number of parameters).
In this tutorial, we have done validation in JavaScript with Hapi Joi module.
© 2007 - 2021 Jan Bodnar admin(at)zetcode.com

https://www.npmjs.com/package/@hapi/joi
Перевести · @hapi/joi The most powerful schema description language and data validator for JavaScript. joi is part of the hapi ecosystem and was designed to work seamlessly with the hapi …
https://zetcode.com/javascript/hapijoi
Перевести · Hapi Joi is an object schema description language and validator for JavaScript objects. With Hapi Joi, we create blueprints or schemas for …
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https://hapi.dev/tutorials/validation/?lang=en_US
Перевести · This tutorial is compatible with hapi v17 and newer; and joi v16 and newer Overview Validating data can be very helpful in making sure that your application is stable and secure. hapi allows this functionality by using the module Joi …
https://dev.to/jacqueline/using-hapi-joi-version-16-1-7-to-validate-a-request-body-in...
Why Validate?
What Then Is @Hapi/Joi
Getting Started
What Are Joi Types
Defining A Schema
Custom Error Messages
Validating Strings
Validating Numbers
From the official documentation from npmjs, @hapi/joi is defined as:" The most powerful schema description language and data validator for JavaScript. joi is part of the hapi ecosystem and was designed to work seamlessly with the hapi web framework and its other components (but works great on its ow…
https://akhromieiev.com/tutorials/using-joi-plugin-for-validation-in-hapi
Payload Validation
Query Validation
params Validation
Headers Validation
Schema Methods
For example, you have the next form on client: The POST /form will receive the name, mail, msgfields. We can assume that the server should validate the fields according to the following logic: 1. name– a string, minimum 3 characters, maximum 15 characters, required; 2. mail– a string, real email, required; 3. ms…
What does @ Hapi / Joi do in JavaScript?
What does @ Hapi / Joi do in JavaScript?
Well to break it down, @hapi/joi is a module that is used to define a schema or blueprint of Javascript objects. Once the schema is defined, you then can use Joi's handy methods that come bundled with it, to validate any other objects against the schema.
dev.to/jacqueline/using-hapi-joi-version-16 …
This plugin comes from Hapi infrastructure, so you don’t need to install any additional packages. You can create your own validation schemas, multiple and conditional schemas. For example, you have the next form on client: The POST /form will receive the name , mail , msg fields.
akhromieiev.com/tutorials/using-joi-plugin-f…
Is joiis part of the hapiecosystem?
Is joiis part of the hapiecosystem?
joiis part of the hapiecosystem and was designed to work seamlessly with the hapi web frameworkand its other components (but works great on its own or with other frameworks). If you are using a different web framework and find this module useful, check out hapi– they work even better together.
nodejs.libhunt.com/joi-alternatives
How to validate JavaScript objects in Hapi?
How to validate JavaScript objects in Hapi?
Using Joi plugin for validation in Hapi. In Hapi, you can validate incoming data using the Joi plugin. It’s object schema language and provides a perfect mechanism to validate JavaScript objects. This plugin comes from Hapi infrastructure, so you don’t need to install any additional packages.
akhromieiev.com/tutorials/using-joi-plugin-f…
https://www.geeksforgeeks.org/how-to-validate-data-using-hapi-joi-module-in-node-js
Перевести · 27.04.2020 · Joi module is a popular module for data validation. This module validates the data based on schemas. There are various functions …
https://stackoverflow.com/questions/50507964
Перевести · HapiJS/Joi Allow field to be String or Object with specific keys. I'm trying to validate a POST request where the title can be a String or an Object …
https://nodejs.libhunt.com/joi-alternatives
Перевести · Tags: Hapi Data Validation Validation Schema Latest version: v17.1.1. joi alternatives and similar modules Based on the "Data Validation" category. Alternatively, view joi …
Перевести · a class or prototype function (usually obtained by calling require() on a catbox strategy such as require('@hapi/catbox-redis')). A new …
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