Configure the environment variables

dot env file

Before beginning development of Asset Compute workers, ensure the project is configured with Adobe I/O and cloud storage information. This information is stored in the project’s .env which is used only for local development, and not save in Git. The .env file provides a convenient way to expose key/values pairs to the local Asset Compute local development environment. When deploying Asset Compute workers to Adobe I/O Runtime, the .env file is not used, but rather a subset of values are passed in via environment variables. Other custom parameters and secrets can be stored in the .env file as well, such as development credentials for 3rd party web services.

Reference the private.key

private key

Open the .env file, uncomment the ASSET_COMPUTE_PRIVATE_KEY_FILE_PATH key, and provide the absolute path on your filesystem to the private.key that pairs with the public certificate added to your Adobe I/O App Builder project.

  • If your key pair was generated by Adobe I/O, it was auto-downloaded as part of the
  • If you provided the public key to Adobe I/O, then you should also be in possession of the matching private key.
  • If you do not have these key pairs, you can generate new key pairs or upload new public keys at the bottom of: > Your Asset Compute App Builder project > Workspaces @ Development > Service Account (JWT).

Remember the private.key file should not be checked into Git as it contains secrets, rather it should be stored in a safe place outside the project.

For example, on macOS this might look like:


Configure Cloud Storage credentials

Local development of Asset Compute workers requires access to cloud storage. The cloud storage credentials used for local development are provided in the .env file.

This tutorial prefers the use of Azure Blob Storage, however Amazon S3 and it’s corresponding keys in the .env file can be used instead.

Using Azure Blob Storage

Uncomment and populate the following keys in the .env file, and populate them with the values for the provisioned cloud storage found on Azure Portal.

Azure Blob Storage

  2. Value for the AZURE_STORAGE_ACCOUNT key
  3. Value for the AZURE_STORAGE_KEY key

For example, this might look like (values for illustration only):


The resultant .env file looks as follows:

Azure Blob Storage credentials

If you are NOT using Microsoft Azure Blob Storage, remove or leave these commented out (by prefixing with #).

Using Amazon S3 cloud storage amazon-s3

If you are using Amazon S3 cloud storage uncomment and populate the following keys in the .env file.

For example, this might look like (values for illustration only):


Validating the project configuration

Once the generated Asset Compute project has been configured, validate the configuration prior to making code changes to ensure the supporting services are provisioned, in the .env files.

To start Asset Compute Development Tool for the Asset Compute project:

  1. Open a command line in the Asset Compute project root (in VS Code this can be opened directly in the IDE via Terminal > New Terminal), and execute the command:

    code language-none
    $ aio app run
  2. The local Asset Compute Development Tool will open in your default Web browser at http://localhost:9000.

    aio app run

  3. Watch the command line output and Web browser for error messages as Development Tool initializes.

  4. To stop the Asset Compute Development Tool, tap Ctrl-C in the window that executed aio app run to terminate the process.