Extract value from nested json in terraform - json

Question

In terraform I have an external data source
data "external" "example" {
program = [
"some_program_generating_json"
]
}
some_program_generating_json produces the following output:
{
"dict1": {
"key1": "value1"
},
"dict2": {
"key1": "value2"
}
}
How can I extract the value of [dict1][key1] from that data source and assign it to some local?
lets say:
locals {
extracted_value = ???
}
Thanks.

Answer 1

I tested it, and had no problems using [dict1][key1] notation. This is the example I used.
script file (test.sh)
#!/usr/bin/bash
# from https://github.com/hashicorp/terraform/issues/13991#issuecomment-526869879
printf '{"base64_encoded":"%s"}\n' $(echo '{"dict1": {"key1": "value1"}, "dict2": {"key1": "value2"}}' | base64 -w 0)
main.tf
data "external" "example" {
program = [
"${path.module}/scripts/test.sh"
]
}
locals {
json_value = jsondecode(base64decode(data.external.example.result["base64_encoded"]))
dict1_key1 = local.json_value["dict1"]["key1"]
}
output "result" {
value = local.dict1_key1
}
The output was:
result = value1

Answer 2

Seems like I figured it out. I had to convert values of dict1 and dict2 to strings:
{
"dict1": "{\"key1\": \"value1\"}",
"dict2": "{\"key1\": \"value2\"}"
}
and then use jsondecode on them. I.e.
locals {
key = "dict1"
extracted_dict = jsondecode("${data.external.example.result[local.key]}")
extracted_value = local.extracted_dict["key1"]
}