Related Post: ansible parse json array reply from api

I have an Ansible playlist which registers a return variable:

- name: Create Instance
ec2_instance:
  aws_access_key: "{{access_key}}"
  aws_secret_key: "{{secret_key}}"
  key_name: ***
  instance_type: t2.micro
  security_group: ***
  image_id: ami-39f8215b
  region: ***
register: details

So the details is a JSON object like this:

{
"details": {
    "changed": false, 
    "changes": [], 
    "failed": false, 
    "instance_ids": [
        "i-1111abcde"
    ],
...
}

All I want to do is write a text file with each instance_id in there:

i-1111abcde

I've tried all of the following, none working:

debug:
  var: item
with_items: details['instance_ids']

debug:
  var: item.item
with_items: details['instance_ids']

debug:
  var: details.instance_ids
with_items: details
# This works, but prints the entire JSON array...

Solution

- name: Debug Info
debug:
  var: item
loop: "{{details.instance_ids}}"

- name: Write Temp File
lineinfile:
  path: /tmp/temp.txt
  line: "{{ item }}"
loop: "{{ details.instance_ids }}"

Note: loop is a more modern Ansible concept that with_items or with_*