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js-formdata-validator
Advanced tools
JS Form Validator is a simple form data validation library for JavaScript. It provides a set of base rules for checking the type and value of various inputs, and allows you to define custom rules as well.
JS Form Validator is a simple form data validation library for JavaScript. It provides a set of base rules for checking the type and value of various inputs, and allows you to define custom rules as well.
To install JS Form Validator, use one of the following package managers:
npm install --save js-formdata-validator
pnpm add js-formdata-validator
// nuxt.config.js
// Add transpile
build: {
transpile: [/js-formdata-validator/],
},
To use JS Form Validator, import the Validator class and create a new instance, passing in an object with the following properties:
import { Validator } from "js-formdata-validator";
const formData = {
name: null,
deep: {
neested: {
object: {
value: null
}
}
},
arrayObject: [
{
objectName: "object a name"
},
{
objectName: null
},
{
objectName: "object c name"
},
]
};
const validator = new Validator({
formData: formData,
rules: {
name: ["required"],
"deep.nested.object.value": ["required"],
"arrayObject.*.objectName": ["required"]
},
});
// Validate the form data
await validator.validate();
// Check if the validation failed
if (validator.fail()) {
// Get the validation error messages
const error = validator.getErrorBag();
console.log(error); // Output: {name: ["The field is required."], "deep.nested.object.value": ["The field is required."], "arrayObject.1.objectName": ["The field is required."]}
}
JS Form Validator provides the following base rules for validating form data:
JS Form Validator provides extendable custom rule to be runs alongside base rules, heres the code example:
const formData = {
age: 25,
};
const validator = new Validator({
formData: formData,
rules: {
age: ["custom"],
},
}).mergeCustomRules({
custom(value) {
if (value === 25) {
return "Test Error";
}
},
});
// Validate the form data
await validator.validate();
// Check if the validation failed
if (validator.fail()) {
// Get the validation error messages
const error = validator.getErrorBag();
console.log(error);
}
We can also parse parameters to the custom rules
const formData = {
age: 25
};
const validator = new Validator({
formData: formData,
rules: {
age: ["ageBetween:26,50"]
},
})
validator.mergeCustomRules({
ageBetween(value, paramA, paramB) {
// paramA will be 26
// paramB will be 50
if (value < paramA || value > paramB) {
return `Age must be between ${paramA} - ${paramB}`;
}
},
});
Or set anonymous function inside the array rules
const formData = {
age: 25
};
const validator = new Validator({
formData: formData,
rules: {
age: [
(value) {
const min = 26
const max = 50
if (value < min || value > max) {
return `Age must be between ${min} - ${max}`;
}
}
]
},
})
It can also use async / await syntax to fetch data and wait it to be fetched from some external source
const formData = {
age: 25
};
const validator = new Validator({
formData: formData,
rules: {
age: [
async (value) {
const { min, max } await fetch('/path/to/your/api');
if (value < min || value > max) {
return `Age must be between ${min} - ${max}`;
}
}
]
},
})
FAQs
JS Form Validator is a simple form data validation library for JavaScript. It provides a set of base rules for checking the type and value of various inputs, and allows you to define custom rules as well.
The npm package js-formdata-validator receives a total of 37 weekly downloads. As such, js-formdata-validator popularity was classified as not popular.
We found that js-formdata-validator demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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