Joi Js

Joi Js
The most powerful schema description language

// https://joi.dev/api/?v=17.4.0

const Joi = require ( 'joi' )

const schema = Joi . object ( {
username : Joi . string ( ) . alphanum ( ) . min ( 3 ) . max ( 30 ) . required ( ) ,

password : Joi . string ( ) . pattern ( new RegExp ( '^[a-zA-Z0-9]{3,30}$' ) ) ,

repeat_password : Joi . ref ( 'password' ) ,

access_token : [ Joi . string ( ) , Joi . number ( ) ] ,

birth_year : Joi . number ( ) . integer ( ) . min ( 1900 ) . max ( 2013 ) ,

email : Joi . string ( ) . email ( {
minDomainSegments : 2 ,
tlds : { allow : [ 'com' , 'net' ] }
} )
} )
. with ( 'username' , 'birth_year' )
. xor ( 'password' , 'access_token' )
. with ( 'password' , 'repeat_password' )

schema . validate ( { username : 'abc' , birth_year : 1994 } )
// -> { value: { username: 'abc', birth_year: 1994 } }

schema . validate ( { } )
// -> { value: {}, error: '"username" is required' }
Type safety in JavaScript is weak (implicit type conversion) and dynamic (type checking happens at runtime). This is a feature that both makes JavaScript popular (short syntax, fast prototyping, etc) and also causes tons of stupid hard-to-debug production errors.
Dynamic type checking may cause a program to fail at runtime, type-checking errors are considered fatal, and this is the last thing you want to happen in live products.
Static type checkers like Flow or TypeScript don’t guarantee type safety at runtime because their type annotations will be stripped off at compile time.
You desperately need data validation at runtime in JavaScript applications that handle arbitrary user inputs, parse JSON content from HTTP requests, marshal and unmarshal data objects for storage or transmit through networks.
Instead of having your data validation and sanitization logic written as lengthy code, you can declare the requirements to your data with concise, easy to read and cross-platform schema description language and validate the data as soon as it arrives to your application.
Joi is the most powerful schema description language
and data validator for JavaScript, for Node.js and browser. It lets you describe your data using a simple, intuitive, and readable language.
There are other less popular JavaScript data validators allow you define a schema, transform a value to match, validate the shape of an existing value, or both.
Check out comprehensive alternatives to Joi here .
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fix: link to ValidationError

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The most powerful data validation library for JS

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The most powerful data validation library for JS

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How to Validate Data using joi Module in Node.js ?
Difficulty Level :
Expert Last Updated :
15 Feb, 2021
//User-defined function to validate the user
    const JoiSchema = Joi.object({
                       .optional(),
        account_status: Joi.string()
                        .valid( 'activated' )
                        .valid( 'unactivated' )
                        .optional(),
    }).options({ abortEarly: false });
    return JoiSchema.validate(user)
    console.log(response.error.details)
    console.log( "Validated Data" )
How to Validate Data using validator Module in Node.js ?
How to Validate Data using express-validator Module in Node.js ?
How to export promises from one module to another module node.js ?
How to allow classes defined in a module to be accessible outside of a module ?
What are the differences between HTTP module and Express.js module ?
How to validate email address using RegExp in JavaScript ?
How to validate an input is alphanumeric or not using JavaScript ?
How to validate if input date (end date) in input field must be after a given date (start date) using express-validator ?
How to validate if input in input field exactly equals to some other value using express-validator ?
How to validate if input in input field has alphanumeric characters only using express-validator ?
How to validate if input in input field has base64 encoded string using express-validator ?
How to validate if input in input field has boolean value using express-validator ?
How to validate if input in input field has ASCII characters using express-validator ?
How to validate if input in input field has base 32 encoded string using express-validator ?
How to validate if input in input field has BIC or Swift code only using express-validator ?
How to validate if input in input field has integer number only using express-validator ?
How to validate if input date (start date) in input field must be before a given date (end date) using express-validator ?
How to validate if input in input field has decimal number only using express-validator ?
How to validate if input in input field is a valid date using express-validator ?
How to validate if input in input field has lowercase letters only using express-validator ?
How to validate if input in input field is divisible by or multiple of a number using express-validator ?
How to validate if input in input field is a valid credit card number using express-validator ?
How to validate if input in input field has uppercase letters only using express-validator?
How to validate if input in input field has float number only using express-validator ?
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Got It !
Joi module is a popular module for data validation. This module validates the data based on schemas. There are various functions like optional(), required(), min(), max(), etc which make it easy to use and a user-friendly module for validating the data. Introduction:
Note: In the above program abortEarly is set to false which makes sure that if there are multiple errors then all are displayed in the terminal. If it is set to true then the execution of the program will stop as soon as the first error is encountered and only that error will be displayed in the terminal.
So this is how you can validate data using joi module. There are other modules in the market for validation like express-validator, etc.
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