Build forms in React, without the tears Formik is the world's most popular open source form library for React and React Native.

Formik keeps track of your form's state and then exposes it plus a few reusable methods and event handlers (handleChange, handleBlur, and handleSubmit) to your form via props. handleChange and …

Use this option to tell Formik to run validations on change events and change -related methods. More specifically, when either handleChange, setFieldValue, or setValues are called.

Basic Example This example demonstrates how to use Formik in its most basic way.

The Basics We’re going to start with the most verbose way of using Formik. While this may seem a bit long-winded, it’s important to see how Formik builds on itself so you have a full grasp of what’s …

<Field /> will automagically hook up inputs to Formik. It uses the name attribute to match up with Formik state. <Field /> will default to an HTML <input /> element.

Formik supports synchronous and asynchronous form-level and field-level validation. Furthermore, it comes with baked-in support for schema-based form-level validation through Yup.

Use this option to tell Formik to run validations on change events and change -related methods. More specifically, when either handleChange, setFieldValue, or setValues are called.

To submit a form in Formik, you need to somehow fire off the provided handleSubmit(e) or submitForm prop. When you call either of these methods, Formik will execute the following (pseudo code) each …

The Formik source code is written in TypeScript, so you can rest easy that Formik's types will always be up-to-date. As a mental model, Formik's type signatures are very similar to React Router 4's <Route>.