Add TS example of handling POST data from a router.

content/api/hub/sample_ts_router_post.md

@@ -0,0 +1,51 @@
+title = "Handle POST Requests with Spin's JS/TS Router"
+template = "render_hub_content_body"
+date = "2023-11-15T00:00:00Z"
+content-type = "text/html"
+tags = ["typescript", "javascript", "router"]
+
+[extra]
+author = "technosophos"
+type = "hub_document"
+category = "Sample"
+language = "JS/TS"
+created_at = "2023-11-15T00:00:00Z"
+last_updated = "2023-11-15T00:00:00Z"
+spin_version = ">v2.0"
+summary =  "Handle POST data from within Spin's JS/TS Router"
+url = "https://github.com/technosophos/ts-router-post"
+keywords = "typescript, javascript, router"
+
+---
+
+This shows one technique for handling POST data using the `Router` object [built into the JS/TS SDK](https://developer.fermyon.com/spin/v2/javascript-components) for Spin.
+
+This example illustrates how to pass the HTTP body from Spin's SDK all the way to your end function without needing to use middleware.
+
+```typescript
+export const handleRequest: HandleRequest = async function (request: HttpRequest): Promise<HttpResponse> {
+  let router = Router()
+
+  // This gets the base path from the request, which is considered better
+  // than hardcoding it. Now, when the `route` is changed in spin.toml,
+  // our code does not need to change.
+  let basePath = request.headers["spin-component-route"]
+
+  // Note that we pass `request.body` as the second param.
+  // That contains an ArrayBuffer with the encoded body.
+  router.post(basePath, (req, body) => {
+
+    // Decode the ArrayBuffer into a string
+    let decodedBody = decoder.decode(body)
+    return {
+      status: 200,
+      headers: { "content-type": "text/plain" },
+      body: decodedBody
+    }
+  })
+  // IMPORTANT: We pass the request body as the second param.
+  return await router.handleRequest(request, request.body)
+}
+```
+
+Check out the GitHub repository for a full runnable example.