How to fetch data in Sanity v3 with React (without Next.js/TypeScript)?

Congrats on upgrading to v3! The good news is that in Sanity v3, you still use @sanity/client to fetch data, but you'll import createClient instead of the old sanityClient export.

Installation

First, install the client library:

npm install @sanity/client

Creating the Client

In v3, you use createClient from @sanity/client:

import { createClient } from '@sanity/client'

export const client = createClient({
  projectId: 'your-project-id', // find this in sanity.json or your Studio
  dataset: 'production', // or your dataset name
  useCdn: true, // set to false if you need fresh data
  apiVersion: '2023-05-03', // use current date (YYYY-MM-DD) to target the latest API version
})

Fetching Data

Once you have your client configured, you can fetch data using GROQ queries:

import { client } from './client' // wherever you created your client

// In your React component
function MyComponent() {
  const [data, setData] = React.useState(null)

  React.useEffect(() => {
    client.fetch('*[_type == "post"]').then((posts) => {
      setData(posts)
    })
  }, [])

  if (!data) return <div>Loading...</div>
  
  return (
    <div>
      {data.map((post) => (
        <div key={post._id}>{post.title}</div>
      ))}
    </div>
  )
}

Key Differences from v2

• Import createClient instead of the default export
• The apiVersion parameter is now required (use a current date in YYYY-MM-DD format)
• The client instance works the same way for .fetch(), .create(), .patch(), etc.

Additional Resources

• Check out the official JavaScript Client on GitHub for full documentation
• The GROQ query cheat sheet is super helpful for writing queries
• For handling images, look into @sanity/image-url
• For rendering rich text (Portable Text), check out @portabletext/react

The React single-page application guide might also be helpful, though it may reference some patterns you can adapt for vanilla React with React Router.

Hope this gets you up and running! 🚀