get_context_var.md

Get a Value from a Context Variable

You can specify a context variable either as part of an AWS CDK CLI command, or in cdk.json.

To create a command line context variable, use the --context (-c) option, as shown in the following example.

cdk synth -c bucket_name=mygroovybucket

To specify the same context variable and value in the cdk.json file, use the following code.

{
  "context": {
    "bucket_name": "myotherbucket"
  }
}

To get the value of a context variable in your app, use code like the following, which gets the value of the context variable bucket_name.

const bucket_name = this.node.tryGetContext("bucket_name");