AWS Lambda tRPC streaming

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An example on how to use tRPC with Lambda streaming.

Uses @trpc/server’s awsLambdaStreamingRequestHandler adapter to handle streaming responses through Lambda function URLs.

The trpc-server function defines a tRPC router and streams responses. The trpc-client function invokes the server using httpBatchStreamLink.

Streaming is supported in both sst dev and sst deploy.

sst.config.ts

const trpcServer = new sst.aws.Function('TrpcServer', {
  handler: 'trpc-server.handler',
  streaming: true,
  url: true,
  runtime: 'nodejs24.x',
});

new sst.x.DevCommand('Client', {
  dev: {
    autostart: false,
    command: $interpolate`npx tsx trpc-client.ts`,
    title: 'Run Client',
  },
  environment: {
    TRPC_SERVER_URL: trpcServer.url,
  },
});

View the full example.