react-validation-hook

React hook for sync and async validation in forms

Website

Visit the website for demo and docs

Features

• Nice and Easy hook based interface
• Supports both Synchronous and Asynchronous validation
• Supports validators like range, required, length, regex out of the box
• Specify custom validators!
• Out of the box formatted error messages, which could be overwritten

Install

npm install --save react-validation-hook

Usage

import React, { useEffect } from "react";
import {
  useValidator,
  requiredValidation,
  lengthValidation,
  asyncValidation
} from "react-validation-hook";
export default () => {
  const asyncFunction = async (value, context) => {
    const response = await fetch("https://jsonplaceholder.typicode.com/photos");
    const res = await response.json();
    if (value.length < 3) {
      throw new Error("Custom error " + value);
    }
  };
  const validators = [
    requiredValidation(),
    lengthValidation(2, 5),
    asyncValidation(asyncFunction)
  ];
  const { error, onChange, pending } = useValidator(validators);
  const changeHandler = e => {
    console.log(e.target.value);
  };
  return (
    <div>
      <ul>
        {error.map((err, idx) => (
          <li key={idx}>{err}</li>
        ))}
      </ul>
      <input onChange={onChange(changeHandler)} />
    </div>
  );
};

License

MIT © sumedh22