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\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`@standardserver/aws-lambda` adapts AWS Lambda events and response streams 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 against the same request, response, body, and streaming primitives whether the underlying transport is the Fetch API, Node.js HTTP, HTTP/2, or a peer-style message channel.\n\nStandard Server ships as a small ecosystem of packages:\n\n| Package | Description |\n| ------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------- |\n| [`@standardserver/core`](https://github.com/middleapi/standardserver/blob/main/packages/core/README.md) | The shared contract: types, body parsing rules, validators, and SSE helpers |\n| [`@standardserver/fetch`](https://github.com/middleapi/standardserver/blob/main/packages/fetch/README.md) | Fetch API adapter for browsers, workers, and other Fetch-based runtimes |\n| [`@standardserver/node`](https://github.com/middleapi/standardserver/blob/main/packages/node/README.md) | Node.js HTTP and HTTP/2 adapter |\n| [`@standardserver/fastify`](https://github.com/middleapi/standardserver/blob/main/packages/fastify/README.md) | Fastify adapter built on the Node.js adapter |\n| [`@standardserver/aws-lambda`](https://github.com/middleapi/standardserver/blob/main/packages/aws-lambda/README.md) | AWS Lambda adapter with response streaming |\n| [`@standardserver/peer`](https://github.com/middleapi/standardserver/blob/main/packages/peer/README.md) | Message-based adapter for WebSocket, MessagePort, and custom transports |\n| [`@standardserver/shared`](https://github.com/middleapi/standardserver/blob/main/packages/shared/README.md) | Internal utilities shared across the ecosystem |\n\nThis package is the AWS Lambda adapter for that model. It converts an API Gateway proxy event β€” payload format version 1.0 or 2.0, the latter also used by Lambda Function URLs β€” into a `StandardLazyRequest`, and writes a `StandardResponse` back through the stream provided by `awslambda.streamifyResponse`, so streaming bodies such as server-sent events flow to the client as they are produced instead of being buffered.\n\n## Package overview\n\nThe package exposes these helpers:\n\n| Group | Exports | Purpose |\n| ----------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- |\n| Request and response | `toStandardLazyRequest()`, `sendStandardResponse()` | Adapt Lambda events and response streams to Standard Server |\n| Lower-level helpers | `toStandardUrl()`, `toStandardHeaders()`, `getEventHeader()`, `toStandardBody()`, `toLambdaHeaders()` | Convert individual pieces of an event |\n| Types and option shapes | `APIGatewayProxyEvent`, `APIGatewayProxyEventV2`, `AnyAPIGatewayProxyEvent`, `HttpResponseStream`, `AwsLambdaGlobal`, `SendStandardResponseOptions` | Type handler inputs and serializer options |\n\n`APIGatewayProxyEvent` and `APIGatewayProxyEventV2` are structural subsets of the same-named types from `@types/aws-lambda`, so events typed with either work; the adapter accepts both via `AnyAPIGatewayProxyEvent` and tells them apart by the top-level `httpMethod` field only payload format 1.0 carries. `AwsLambdaGlobal` describes the `awslambda` global the Lambda Node.js runtime injects β€” the package deliberately does not `declare global`, so importing it never pollutes your project's global types. Declare the global yourself where you need typed access to `awslambda.streamifyResponse`.\n\n## Server-side request handling\n\nUse `toStandardLazyRequest()` to convert the incoming event into a `StandardLazyRequest`, then `sendStandardResponse()` to write the resulting `StandardResponse` back through the response stream. The handler must be wrapped with `awslambda.streamifyResponse`, and the function must run on the AWS Lambda Node.js runtime with response streaming enabled.\n\n```ts\nimport type { AwsLambdaGlobal } from '@standardserver/aws-lambda'\nimport type { StandardLazyRequest, StandardResponse } from '@standardserver/core'\nimport { sendStandardResponse, toStandardLazyRequest } from '@standardserver/aws-lambda'\n\n// injected by the AWS Lambda Node.js runtime when response streaming is enabled\ndeclare const awslambda: AwsLambdaGlobal\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 const handler = awslambda.streamifyResponse(async (event, responseStream, context) => {\n const standardRequest = toStandardLazyRequest(event, responseStream)\n const standardResponse = await handle(standardRequest)\n\n await sendStandardResponse(responseStream, standardResponse, {/** options */})\n})\n```\n\n`sendStandardResponse()` sends the status, headers, and cookies as the response stream metadata prelude via `awslambda.HttpResponseStream.from()`, then streams the body. It resolves once the response is fully flushed, and rejects if the stream errors.\n\n> [!TIP]\n> When sending responses, you can pass additional options such as event-stream keep-alive.\n\n## Resolving Body\n\nThe event carries the request body as a fully buffered, optionally base64-encoded string. `resolveBody(hint?)` decodes it and then follows the shared Standard Server resolution rules: an explicit `hint` wins, then the [`standard-server` header](https://github.com/middleapi/standardserver/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/standardserver/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## Lambda behavior to be aware of\n\n- **Response streaming must be enabled.** `sendStandardResponse()` relies on the `awslambda` global, which only exists on the AWS Lambda Node.js runtime, and on the metadata prelude of `awslambda.HttpResponseStream`, which the platform only interprets for streaming-enabled invocations.\n- **`set-cookie` is sent via metadata cookies.** Multiple cookies survive because they are sent through the dedicated `cookies` metadata field; every other multi-value header is joined with `, `.\n- **Request bodies are buffered.** API Gateway delivers the whole request body at once, so request-side streaming degrades to a single buffered chunk. Response-side streaming is real streaming.\n- **Payload format 1.0 query strings are re-encoded.** API Gateway delivers them url-decoded, so the adapter re-encodes them when reconstructing the standard url. Payload format 2.0 provides the already encoded `rawQueryString`, which is used as-is.\n- **Payload format 2.0 cookies are restored.** API Gateway strips the `cookie` header into the separate `cookies` field, and the adapter joins them back into a `cookie` header on the standard request.\n\n## Learn more\n\nFor the project overview and the shared contract, see the [core documentation](https://github.com/middleapi/standardserver/blob/main/packages/core/README.md). For the Node.js primitives this adapter is built on, see the [Node.js adapter documentation](https://github.com/middleapi/standardserver/blob/main/packages/node/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
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\"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
\"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
\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/standardserver/blob/main/LICENCE) for more information.\n","readmeFilename":""}