# Platform Compatibility \[Platforms compatible with Viem]

**Viem supports all modern browsers (Chrome, Edge, Firefox, etc) & runtime environments (Node 18+, Deno, Bun, etc).**

Viem uses modern EcmaScript features such as:

* [`BigInt`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt)
* [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API)
* Error [`cause`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause)
* TextEncoder [`encode`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder/encode)

You can check support for these features on [Can I use...](https://caniuse.com/)

## Polyfills

If your platform does not support one of the required features, it is also possible to import a polyfill.

### `fetch`

* [isomorphic-unfetch](https://github.com/developit/unfetch/tree/main/packages/isomorphic-unfetch)
* [node-fetch](https://github.com/node-fetch/node-fetch#providing-global-access)

### Error `cause`

* [core-js](https://github.com/zloirock/core-js)

### `TextEncoder`

* [FastestSmallestTextEncoderDecoder](https://github.com/anonyco/FastestSmallestTextEncoderDecoder)