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Sep 14, 2021
Jun 4, 2020
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Jun 4, 2020

Getting started

Build and test

Fork this project to create your own Rust functions as a web service.

How it works

  • The Rust function source code is in the src/ file.
  • Use the rustwasmc tool to compile the Rust function into a WebAssembly module in the pkg directory.
  • Optional: Use the node node/app.js command to test the function locally in Node.js.
  • Upload the pkg/*.wasm file to the Second State FaaS service, OR to a Node.js server, to turn it into a web service.


It is easy to use our appdev Docker image to run the dev environment. You can choose from x86_64 or aarch64 versions of the image. Alternatively, you could also use Github Codespaces to run the following example.

$ docker pull wasmedge/appdev_x86_64
$ docker run -p 3000:3000 --rm -it -v $(pwd):/app wasmedge/appdev_x86_64
(docker) #


Use the rustwasmc command to build the Rust function into a WebAssembly bytecode file.

(docker) # cd /app
(docker) # rustwasmc build

Test and debug

From the first terminal window, start the Node.js application.

(docker) # node node/app.js

From a second terminal window, you can test the local server.

$ curl http://localhost:3000/?name=WasmEdge
hello WasmEdge

Optional: Upload to the FaaS and test

Upload the wasm file in the pkg folder to the FaaS. Double check the .wasm file name before you upload.

(docker) # curl --location --request POST '' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM-Description: say hello' \
--data-binary '@pkg/hello_lib_bg.wasm'

The FaaS returns


Make a function call via the web.

(docker) # curl --location --request POST '' \
--header 'Content-Type: text/plain' \
--data-raw 'Second State FaaS'
hello Second State FaaS

You can easily incorporate this web service into your HTML web pages. See how

More exercises

Now, you can copy and paste code from this project.

Read more:


  • The WasmEdge Runtime is a high performance WebAssembly virtual machine designed for edge computing (including Edge Cloud) applications.
  • The rustwasmc is a toolchain for compiling Rust programs into WebAssembly, and then make them accessible from JavaScripts via the WasmEdge Runtime.
  • The Second State FaaS is an open source FaaS engine based on WebAssembly and Node.js.

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