Question about program language of AWS IoT Greengrass

Question

From [AWS IoT Greengrass FAQs](https://aws.amazon.com/greengrass/faqs/?nc1=h_ls), it said AWS IoT Greengrass discovery is available on the AWS IoT Device SDK via C++, Node.js, Java, and Python 2.7, 3.7, and 3.8.

However, my application is used **JavaScript and React**. Then, I found [aws.greengrass.labs.LocalWebServer](https://github.com/awslabs/aws-greengrass-labs-local-web-server). Is it possible for me to use this aws.greengrass.labs.LocalWebServer deploy the application on Greengrass.

Rather than this aws.greengrass.labs.LocalWebServer, **do I have another way to deploy my application on AWS IoT Greengrass**?

P.S. I am using Ubuntu, but I am **unable** to download docker.

**Thank you very much!**

Answer

Hi,

You can follow these steps to run your react app in Greengrass, assuming you have `node` installed on the device:

1. Build your react app with `npm run build`, 
2. zip the content of the `build` folder and upload it to `s3:///com.example.ReactApp/build.zip`. 
3. create a component with the following recipe

```yaml
RecipeFormatVersion: 2020-01-25
ComponentName: com.example.ReactApp
ComponentVersion: 1.0.7
ComponentDescription: ""
ComponentPublisher: Amazon
ComponentDependencies: {}
Manifests:
  - Platform:
      os: /linux/
      architecture: /x86|aarch64|amd64|arm/
    Lifecycle:
      Install: |-
        npm init -y
        npm install live-server
      Run:
        Script: node node_modules/live-server/live-server.js {artifacts:decompressedPath}/build
    Artifacts:
      - Uri: s3:///com.example.ReactApp/build.zip
        Unarchive: ZIP
```

4. deploy the component to your device

`live-server` (or `SimpleHTTPServer` in Python) are not suitable for production workloads but work fine for development and experimentation.

For a more robust serving of your application, consider using NGINX or `httpd`.

Cheers,

Massimiliano

Question about program language of AWS IoT Greengrass

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