@webiny/validation
Advanced tools
A simple data validation library, packed with frequently used validators.
A simple data validation library, packed with frequently used validators like required, email, url, creditCard etc.
yarn add @webiny/validation
Validation of data is performed asynchronously by default, like in the following example:
import { validation } from '@webiny/validation';
validation.validate(123, 'required,number,gt:20').then(() => {
// Value is valid
}).catch(e => {
// Value is invalid
});
Validators are specified by its name and in this case, there are three - required, number and gt.
Since value is not empty, it is a number and is greater than 20, code execution will proceed regularly.
On the other hand, if one of the validator was not satisfied, an instance of ValidationError would be thrown.
import { validation } from '@webiny/validation';
validation.validate(10, 'required,number,gt:20').catch(e => {
// Throws an Error with message "Value needs to be greater than 20.".
});
It is possible to provide as many validators as needed.
As seen in previous section, validators can accept additional arguments, which are divided by colon. The following validator simply states that value must be greater than 20:
gt:20
Some validators may even accept more than one arguments:
in:dog:cat:fish:bird
There is no limit on the number of passed arguments.
The following is a complete list of built-in validators, ready to be used immediately:
creditCardemaileqgtgteinintegerltltemaxLengthminLengthnumberpasswordphonerequiredurlMore information about each can be found in the following sections.
Apart from built-in validators, there are cases where additional validators might be needed. The following example shows how to add a custom validator:
import { validation, ValidationError } from '@webiny/validation';
validation.setValidator('gender', value => {
if (['male', 'female'].includes(value)) {
return;
}
throw new ValidationError('Value needs to be "male" or "female".);
});
// Throws an instance of ValidationError error.
await validation.validate('none', 'gender');
As mentioned, validation by default is performed asynchronously. But if more suitable, it can also be performed synchronously:
import { validation } from '@webiny/validation';
// Throws an instance of ValidationError error.
validation.validateSync('parrot', 'in:cat:dog:fish:parrot');
// Success.
validation.validateSync('fish', 'in:cat:dog:fish:parrot');
The following example shows how to force ValidationError to be returned, instead of thrown:
import { validation } from '@webiny/validation';
const error = await validation.validate("", "required", { throw: false });
Once executed, an instance of ValidationError will be assigned to the error constant.
packages-utils/@webiny/validation/src/validation.js:23-148
Main class of Validation library. Exported as a singleton instance, it offers methods for sync/async data validation and overwriting or adding new validators.
Examples
import { validation } from '@webiny/validation';
// `validation` is a preconfigured instance of Validation class.
// From here you can either add new validators or use it as-is.
packages-utils/@webiny/validation/src/validation.js:40-43
Add new validator.
Parameters
name string Validator name.callable Validator Validator function which throws a ValidationError if validation fails.Returns Validation
packages-utils/@webiny/validation/src/validation.js:50-55
Get validator function by name.
Parameters
name string Validator name.Returns Validator A validator function.
packages-utils/@webiny/validation/src/validation.js:64-92
Asynchronously validates value.
Parameters
value any Value to validate.validators string A list of comma-separated validators (eg. required,number,gt:20).options ValidateOptions Validation options.Returns Promise<(boolean | ValidationError)>
packages-utils/@webiny/validation/src/validation.js:101-129
Synchronously validates value.
Parameters
value any Value to validate.validators string A list of comma-separated validators (eg. required,number,gt:20).options ValidateOptions Validation options.Returns Promise<(boolean | ValidationError)>
packages-utils/@webiny/validation/src/validationError.js:10-21
This class is used by validators to throw an error when value validation fails.
Parameters
message string Error messagevalidator string Validator that triggered this errorvalue any Value that triggered this errorpackages-utils/@webiny/validation/src/validators/creditCard.js:17-54
Credit card validator. This validator will check if the given value is a credit card number.
Parameters
value any This is the value that will be validated.Examples
import { validation } from '@webiny/validation';
validation.validate('notACreditCard', 'creditCard').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/email.js:17-27
Email validator. This validator checks if the given value is a valid email address.
Parameters
value any This is the value that will be validated.Examples
import { validation } from '@webiny/validation';
validation.validate('email@gmail.com', 'email').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/eq.js:18-27
Equality validator. This validator checks if the given values are equal.
Parameters
value any This is the value that will be validated.params Array<string> This is the value to validate against. It is passed as a validator parameter: eq:valueToCompareWithExamples
import { validation } from '@webiny/validation';
validation.validate('email@gmail.com', 'eq:another@gmail.com').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/gt.js:18-25
"Greater than" validator. This validator checks if the given values is greater than the min value.
Parameters
value any This is the value that will be validated.params Array<string> This is the value to validate against. It is passed as a validator parameter: gt:valueToCompareAgainstExamples
import { validation } from '@webiny/validation';
validation.validate(10, 'gt:100').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/gte.js:18-25
"Greater than or equals" validator. This validator checks if the given values is greater than or equal to the min value.
Parameters
value any This is the value that will be validated.min any This is the value to validate against. It is passed as a validator parameter: gte:valueToCompareAgainstExamples
import { validation } from '@webiny/validation';
validation.validate(10, 'gte:100').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/in.js:18-27
"In array" validator. This validator checks if the given values is greater than or equal to the min value.
Parameters
value any This is the value that will be validated.params any This is the array of values to search in. It is passed as a validator parameter: in:1:2:3. Array values are separated by :.Examples
import { validation } from '@webiny/validation';
validation.validate(10, 'in:10:20:30').then(() => {
// Valid
}).catch(e => {
// Invalid
});
packages-utils/@webiny/validation/src/validators/number.js:11-19
This validator checks of the given value is a number
Parameters
value anyReturns boolean
packages-utils/@webiny/validation/types.js:9-9
This type defines the validator function.
Parameters
value any This is the value being validated.
parameters Array<string> (Optional) This represents an array validator parameters.
Throws ValidationError
packages-utils/@webiny/validation/types.js:17-19
This is an object containing validation options.
Properties
throw boolean Should validation throw on failure? Default: true.FAQs
A simple data validation library, packed with frequently used validators.
We found that @webiny/validation demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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