# React

> A React form with pending, error and success states, field errors and an optional human check.

This works in any React app: Vite, Remix, React Router, Gatsby or a Next.js client component. It posts straight from the browser, so each visitor counts toward their own rate limit.

## Install the SDK

`Terminal`:

```bash
npm install @ikiform/sdk
```

## A complete form

`contact-form.jsx`:

```jsx
import { challenge, submit } from "@ikiform/sdk";
import { useState } from "react";

const FORM_ID = "frm_xxxxxxxxxxxxxxxx";

export function ContactForm({ humanCheck = false }) {
  const [status, setStatus] = useState("idle");
  const [errors, setErrors] = useState({});
  const [message, setMessage] = useState("");

  async function onSubmit(event) {
    event.preventDefault();
    const data = new FormData(event.currentTarget);
    setStatus("sending");
    setErrors({});
    try {
      const turnstileToken = humanCheck ? await challenge(FORM_ID) : undefined;
      const result = await submit(FORM_ID, data, { turnstileToken });
      if (result.ok) return setStatus("sent");
      setErrors(result.error.fields ?? {});
      setMessage(result.error.message);
    } catch {
      setMessage("The human check didn't finish. Try again.");
    }
    setStatus("error");
  }

  if (status === "sent") return <p>Thanks, we got it.</p>;

  return (
    <form onSubmit={onSubmit}>
      <label>
        Email
        <input name="email" type="email" required />
      </label>
      {errors.email ? <p>{errors.email[0]}</p> : null}
      <label>
        Message
        <textarea name="message" />
      </label>
      {errors.message ? <p>{errors.message[0]}</p> : null}
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {status === "error" && message ? <p role="alert">{message}</p> : null}
      <button disabled={status === "sending"}>Send</button>
    </form>
  );
}
```

- Pass `humanCheck` when the form's spam check is set to **Ikiform**. With the check off, leave it out.
- `challenge` rejects with a `ChallengeError` if the check fails or is aborted, which the `catch` turns into a message.
- Without the SDK, replace `submit` with `fetch` as on [JavaScript and fetch](https://ikiform.com/docs/frameworks.md#fetch).

## As a form action

In React 19, the value `submit` returns also satisfies the form action type, so it can be passed straight to `action`. React's internal `$ACTION_` fields are dropped before sending.

`newsletter.jsx`:

```jsx
import { submit } from "@ikiform/sdk";

export function Newsletter() {
  return (
    <form action={(data) => submit("frm_xxxxxxxxxxxxxxxx", data)}>
      <input name="email" type="email" required />
      <button>Subscribe</button>
    </form>
  );
}
```

## Validate before sending

`validate` uses the same rules and messages as the server for all 12 field types, so you can show errors before the request. The server stays the source of truth.

`validate.js`:

```js
import { getSchema, validate } from "@ikiform/sdk";

const schema = await getSchema("frm_xxxxxxxxxxxxxxxx");

function check(form) {
  if (!schema.ok) return {};
  return validate(schema.schema.fields, new FormData(form));
}
```