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Deno, Bun, and any Fetch-based runtime","maintainers":[{"name":"dinwwwh","email":"dinwwwh@gmail.com"}],"readme":"# @standard-server/fetch\n\n
\n \n \"codecov\"\n \n \n \"weekly\n \n \n \"CodSpeed\"\n \n \n \"MIT\n \n \n \"Discord\"\n \n \n \"Ask\n \n
\n\n`@standard-server/fetch` adapts the Fetch API to the transport-agnostic request and response model defined by Standard Server.\n\nStandard Server provides a unified interface for client-server communication across HTTP and message-based transports. It lets you write handlers and clients against the same request, response, body, and streaming primitives whether the underlying transport is Fetch, Node.js HTTP, or a peer-style message channel.\n\nStandard Server ships as a small ecosystem of packages:\n\n| Package | Description |\n| --------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------- |\n| [`@standard-server/core`](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md) | The shared contract: types, body parsing rules, validators, and SSE helpers |\n| [`@standard-server/fetch`](https://github.com/middleapi/standard-server/blob/main/packages/fetch/README.md) | Fetch API adapter for browsers, workers, and other Fetch-based runtimes |\n| [`@standard-server/node`](https://github.com/middleapi/standard-server/blob/main/packages/node/README.md) | Node.js HTTP and HTTP/2 adapter |\n| [`@standard-server/fastify`](https://github.com/middleapi/standard-server/blob/main/packages/fastify/README.md) | Fastify adapter built on the Node.js adapter |\n| [`@standard-server/aws-lambda`](https://github.com/middleapi/standard-server/blob/main/packages/aws-lambda/README.md) | AWS Lambda adapter with response streaming |\n| [`@standard-server/peer`](https://github.com/middleapi/standard-server/blob/main/packages/peer/README.md) | Message-based adapter for WebSocket, MessagePort, and custom transports |\n| [`@standard-server/shared`](https://github.com/middleapi/standard-server/blob/main/packages/shared/README.md) | Internal utilities shared across the ecosystem |\n\nThis package is the Fetch API adapter for that model. It converts between native `Request`, `Response`, `Headers`, and stream values and the corresponding Standard Server shapes from [`@standard-server/core`](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md).\n\n## Package overview\n\nThe package exposes three groups of helpers:\n\n| Group | Exports | Purpose |\n| ----------------------- | --------------------------------------------------------------------------------- | ----------------------------------------------------- |\n| Request and response | `toStandardLazyRequest()`, `toStandardLazyResponse()`, `toFetchResponse()` | Convert between Fetch API objects and Standard Server |\n| Body and stream helpers | `toStandardBody()`, `toFetchBody()`, `toAsyncIteratorObject()`, `toEventStream()` | Parse and serialize body values, including SSE |\n| Header and URL helpers | `toStandardHeaders()`, `toFetchHeaders()`, `toStandardUrl()` | Normalize Fetch headers and URLs for Standard Server |\n\nUse these helpers when you want Standard Server handlers to run in Fetch-based runtimes such as browsers, Cloudflare Workers, Bun, Deno, service workers, or server frameworks that expose the standard Fetch API.\n\n## Server-side request handling\n\nUse `toStandardLazyRequest()` to convert an incoming Fetch `Request` into a `StandardLazyRequest`, then `toFetchResponse()` to turn the resulting `StandardResponse` back into a Fetch `Response`.\n\n```ts\nimport type { StandardLazyRequest, StandardResponse } from '@standard-server/core'\nimport { toFetchResponse, toStandardLazyRequest } from '@standard-server/fetch'\n\nasync function handle(request: StandardLazyRequest): Promise {\n const body = await request.resolveBody()\n\n return {\n status: 200,\n headers: { 'content-type': 'application/json' },\n body: {\n ok: true,\n method: request.method,\n url: request.url,\n received: body,\n },\n }\n}\n\nexport async function fetchHandler(request: Request): Promise {\n const standardRequest = toStandardLazyRequest(request)\n const standardResponse = await handle(standardRequest)\n return toFetchResponse(standardResponse, {/** options */})\n}\n```\n\n## Client-side response handling\n\nUse `toFetchBody()` and `toFetchHeaders()` to serialize an outgoing request, and `toStandardLazyResponse()` when you receive a Fetch `Response` but want to work with the Standard Server response contract.\n\n```ts\nimport { toFetchBody, toFetchHeaders, toStandardLazyResponse } from '@standard-server/fetch'\n\nconst standardRequest = {\n method: 'POST',\n url: '/echo',\n headers: { 'content-type': 'application/json' },\n body: { message: 'hello' },\n}\n\nconst [body, headers] = toFetchBody(standardRequest.body, standardRequest.headers, {/** options */})\nconst response = await fetch(standardRequest.url, {\n method: standardRequest.method,\n headers: toFetchHeaders(headers),\n body,\n})\n\nconst standardResponse = toStandardLazyResponse(response)\nconst payload = await standardResponse.resolveBody()\n```\n\n`toFetchBody()` also prepares the content headers for the body it serializes β€” for example, a `Blob` or `File` body gains `standard-server: file`, `content-length`, and a generated `content-disposition`, so the receiver reconstructs the same body type. See [the `standard-server` header](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md#the-standard-server-header) in the core README for why.\n\n> [!TIP]\n> When sending requests or responses, you can pass additional options such as event-stream keep-alive.\n\n## Resolving Body\n\n`resolveBody(hint?)` follows the shared Standard Server resolution rules: an explicit `hint` wins, then the [`standard-server` header](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md#the-standard-server-header), then inference from the content headers. See [how body parsing works](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md#how-body-parsing-works) in the core README for the full algorithm.\n\n> [!TIP]\n> For efficient communication, set the `standard-server` header to explicitly hint the body type, especially for file or binary streaming. For example, if you upload a file with a common `content-type` such as `application/json` but omit the `standard-server` header, the server may interpret it as JSON and parse it unexpectedly.\n\n## Learn more\n\nFor the project overview and the shared contract this adapter implements, see the [core documentation](https://github.com/middleapi/standard-server/blob/main/packages/core/README.md).\n\n## Sponsors\n\nLike what we build over at [middleapi](https://github.com/middleapi)? You can help keep it going through [GitHub Sponsors](https://github.com/sponsors/dinwwwh) or [Open Collective](https://opencollective.com/middleapi). Every bit helps! πŸš€\n\n\n \n \n \n \n \n \n \n \n \n
\"ScreenshotOne.com\"/ScreenshotOne.com
The screenshot API for developers
\"Yuzu\"/Yuzu
We're hiring NYC based engineers
\"MisskeyHQ\"/MisskeyHQ
Decentralized microblogging SNS born on Earth
\n\n### Special Sponsors\n\n\n \n \n \n
\"Guillermo
Guillermo Rauch
\n\n### Organization Sponsors\n\n\n \n \n \n
\"LN
LN Markets
\n\n### Sponsors\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\"Reece
Reece McDonald		\"あわわわとーにゅ\"/
あわわわとーにゅ		\"nk\"/
nk		\"supastarter\"/
supastarter		\"Dexter
Dexter Miguel		\"herrfugbaum\"/
herrfugbaum
\"Ryota
Ryota Murakami		\"David
David Cramer		\"Valerii
Valerii Petryniak		\"Valerii
Valerii Strilets		\"Kyle
Kyle Mistele		\"christ12938\"/
christ12938
\"Ryan
Ryan Soderberg		\"shota\"/
shota		\"Ellis
Ellis Driscoll		\"Hoang
Hoang Nguyen		\"Orestis
Orestis Ioannou		\"Stefan
Stefan Smiljkovic
\n\n### Backers\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\"David
David Walsh		\"IPv4Addr\"/
IPv4Addr		\"Robbe
Robbe Vaes		\"Aidan
Aidan Sunbury		\"soonoo\"/
soonoo		\"Kevin
Kevin Porten		\"Denis\"/
Denis
\"Christopher
Christopher Kapic		\"Tom
Tom Ballinger		\"Sam\"/
Sam		\"Titoine\"/
Titoine		\"Igor
Igor Makowski		\"hanayashiki\"/
hanayashiki		\"Lev
Lev Dubinets
\"Kelly
Kelly Peilin Chan		\"Guy
Guy Ariely		\"PaulSenon\"/
PaulSenon		\"Alex\"/
Alex		\"Andrey
Andrey Gubanov
\n\nWith thanks to [36 past sponsors](https://htmlpreview.github.io/?https://github.com/middleapi/static/blob/main/sponsors.svg) who helped get us here.\n\n## License\n\nDistributed under the MIT License. See [LICENCE](https://github.com/middleapi/standard-server/blob/main/LICENCE) for more information.\n","readmeFilename":""}