Ansible - json parsing - "variable is not defined" - json

Question

Environment:
Ansible: 2.10.12
Python: 3.6.8
Jinja2: 3.0.1
Given an API response, I'm trying to grab the address, but getting "variable is not defined". Here's a playbook that has the API response as a var:
---
- name: test
gather_facts: no
hosts: localhost
vars:
pool_details: {
"allow": "",
"cache_control": "no-store, no-cache, must-revalidate",
"changed": false,
"connection": "close",
"content_length": "668",
"content_security_policy": "default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob:; img-src 'self' data: http://127.4.1.1 http://127.4.2.1",
"content_type": "application/json; charset=UTF-8",
"cookies": {},
"cookies_string": "",
"date": "Tue, 24 Aug 2021 16:34:47 GMT",
"elapsed": 0,
"expires": "-1",
"failed": false,
"json": {
"items": [
{
"address": "10.200.136.22",
"connectionLimit": 0,
"dynamicRatio": 1,
"ephemeral": "false",
"fqdn": {
"autopopulate": "disabled"
},
"fullPath": "/Common/sensor01:443",
"generation": 103,
"inheritProfile": "enabled",
"kind": "tm:ltm:pool:members:membersstate",
"logging": "disabled",
"monitor": "default",
"name": "sensor01:443",
"partition": "Common",
"priorityGroup": 0,
"rateLimit": "disabled",
"ratio": 1,
"selfLink": "https://localhost/mgmt/tm/ltm/pool/~Common~sensor01/members/~Common~sensor01:443?ver=16.1.0",
"session": "monitor-enabled",
"state": "up"
}
],
"kind": "tm:ltm:pool:members:memberscollectionstate",
"selfLink": "https://localhost/mgmt/tm/ltm/pool/~Common~sensor01/members?ver=16.1.0"
},
"msg": "OK (668 bytes)",
"pragma": "no-cache",
"redirected": false,
"server": "Jetty(9.2.22.v20170606)",
"status": 200,
"strict_transport_security": "max-age=16070400; includeSubDomains",
"x_content_type_options": "nosniff",
"x_frame_options": "SAMEORIGIN",
"x_xss_protection": "1; mode=block"
}
tasks:
- debug:
var: pool_details
- debug:
var: pool_details.json.items[0].address
The full error, with verbosity enabled is:
pool_details.json.items[0].address: 'VARIABLE IS NOT DEFINED!: builtin_function_or_method object has no element 0'
My second debug to grab the address isn't working ("not defined"), & I can't figure out why. If I take the same json, & pipe it to jq, it works just fine:
pbpaste | jq '.json.items[0].address'
"10.200.136.22"

Answer 1

items is a Python dictionary method.
To return the value to the key "items":
- debug:
var: pool_details.json['items'][0].address

Answer 2

If there are more items in the list you might want to use json_query, e.g.
- set_fact:
list_address: "{{ pool_details.json['items']|
json_query('[].address') }}"
gives
list_address:
- 10.200.136.22
If you don't want to, or can't, install JmesPath, the next option would be map attribute, e.g. the code below gives the same result
- set_fact:
list_address: "{{ pool_details.json['items']|
map(attribute='address')|
list }}"