--- title: Dart Edge runtime APIs description: Discover what runtime APIs are available with Dart Edge, their status and differences. --- # Runtime APIs This page outlines the available runtime APIs which Dart Edge provides. The APIs attempt to match the underlying JavaScript APIs as closely as possible, however provide a "Dartified" API where it makes sense. Implemented APIs are not guaranteed to be stable and may change in future releases (this is experimental!). | Status | Description | | :----: | ---------------------------------- | | ✅ | API is implemented & fully tested. | | 🟢 | API is implemented. | | 🟠 | API is partially implemented. | | 🔴 | API is not implemented. | ## Network APIs | API | Status | MDN Reference | API Reference | | ----------------------- | :----: | :---------------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------: | | `addFetchEventListener` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/addFetchEventListener.html) | | `Fetch` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/fetch.html) | | `FetchEvent` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/FetchEvent) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/FetchEvent-class.html) | | `Headers` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Headers) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/Headers-class.html) | | `Request` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Request) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/Request-class.html) | | `Response` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Response) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/Response-class.html) | | `FormData` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/FormData) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/FormData-class.html) | ## Encoding APIs | API | Status | MDN Reference | API Reference | | ------------- | :----: | :----------------------------------------------------------------------: | :-----------------------------------------------------------------------------------------: | | `TextDecoder` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/TextDecoder-class.html) | | `TextEncoder` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/TextEncoder-class.html) | | `atob` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/atob) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/atob.html) | | `btoa` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/btoa) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/btoa.html) | ## Stream APIs The Streaming APIs are subject to change. Dart provides great support for Streams so we're still figuring out the best public API for interacting with these underlying APIs. | API | Status | MDN Reference | API Reference | | ----------------------------- | :----: | :--------------------------------------------------------------------------------: | ---------------------------------------------------------------------------------------- | | `ReadableStream` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/ReadableStream-class.html) | | `ReadableStreamBYOBReader` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBReader) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/ReadableStreamBYOBReader-class.html) | | `ReadableStreamDefaultReader` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/ReadableStreamDefaultReader-class.html) | | `TransformStream` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/TransformStream-class.html) | | `WritableStream` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/WritableStream-class.html) | | `WritableStreamDefaultWriter` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/WritableStreamDefaultWriter-class.html) | ## Crypto APIs | API | Status | MDN Reference | API Reference | | -------------- | :----: | :-------------------------------------------------------------------: | ------------- | | `crypto` | 🟠 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API) | | | `CryptoKey` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey) | | | `SubtleCrypto` | 🔴 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) | | ## Standard APIs | API | Status | MDN Reference | API Reference | | ----------------- | :----: | :--------------------------------------------------------------------: | ----------------------------------------------------------------------------------------------- | | `AbortController` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/AbortController) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/AbortController-class.html) | | `Cache` | 🟢 | [📖](https://developer.mozilla.org/en-US/docs/Web/API/Cache) | [📖](https://pub.dev/documentation/edge_runtime/latest/edge_runtime/Cache-class.html) |