A simple yet powerful library which helps creating validated forms in react.


1320.1.24 years ago4 years agoMinified + gzip package size for @cat-react/form in KB



@cat-react / form Build Status codecov npm version

A simple yet powerful library which helps creating validated forms in react. This project is inspired by formsy-react.


npm package

  • Install the dependency @cat-react/form
    (e.g. with yarn add @cat-react/form or npm install @cat-react/form --save)
  • Import the Components with import {Form, Input} from '@cat-react/form';

Getting Started

API Documentation Examples

Are you looking for a simple way to create validated forms with React?

Congratulations! Your search is over, because @cat-react/form offers you a simple way to create either frontend- or backend-validated forms. Validations can either be processed synchronous or asynchronous and the state of the form is being refreshed in real time.

Take a look at the examples to find out how to create the form of your desire.

    <MyInput name="email"
                 isEmail: true,
                 isRequired: true
    <MyInput name="email_confirm"
                 isRequired: true,
                 equalsField: 'email'
                 isRequired: 'Please confirm your email address.',
                 equalsField: 'The email addresses do not match each other.'

Example Custom TextInput

Here you can see an example of an custom TextInput which shows how you can implement your own Inputs:

import React from 'react';
import {Input} from '@cat-react/form'

export default class BasicInput extends React.Component {
    onChange(event) {

    getClassName() {
        let className = 'form-control';
        if (!this.props.isPristine()) {
            if (this.props.isValid()) {
                const isWarning = this.props.getMessages().length > 0;
                if (isWarning) {
                    className += ' warning';
            } else {
                className += ' error';
        return className;

    renderMessages() {
        let messages = [];
        if (!this.props.isPristine()) {
            messages = this.props.getMessages();

        if (!messages || messages.length <= 0) {
            return null;

        let className = 'errorText';
        if (this.props.isValid()) {
            className = 'warningText';

        return <ul className={className}>{messages.map((message, i) => <li key={i}>{message}</li>)}</ul>;

    render() {
        return (
            <div className="form-group">
                <label htmlFor={this.props.name}>{this.props.label} {this.props.isRequired() ? '*' : null}</label>
                <input type={this.props.type}

Note: You need the babel-plugin-transform-decorators plugin to use the @Input decorator. If you don't want or cannot add this plugin to you webpack config you need to use the HOC as a function (like the connect() HOC of Redux).

Example: export default Input(BasicInput)

See the Babel Documentation for a detailed guide about how to add decorators to your application.


The project requires at least the latest stable version of node and npm. You also need to have yarn installed globally.

Two simple steps to get the things running on your local machine:

  • Fork the repo
  • Execute yarn

You can run the examples with yarn run examples and the tests with yarn test.

How to build a release

  • update the CHANGELOG.md with all changes regarding the new release
  • update the release version in the package.json
  • push the changes
  • build the project locally with npm run build
  • cd into the dist folder and run npm publish --access public
  • draft a new release at Github with the contents of the CHANGELOG.md file


MIT License

Copyright (c) 2018 Catalysts GmbH

If you find any bugs or have a feature request, please open an issue on github!

The npm package download data comes from npm's download counts api and package details come from npms.io.