Parsing json output retrieved from an API using Ansbile - json

Question

I am new to Ansible. I am trying to fetch some API info from a centralized server in the json format, parse the json and set "certificate" to "yes" for each and every server and make a PUT operation back. GET and PUT operations in my code are working fine.
I am not able to find correct syntax to parse listofservers.json.
What is the syntax to display a specific json element??
Can you help me on how to parse the json to change "Certificate" value to Yes for all the servers?
My script
- hosts: serverlist
vars_prompt:
- name: "USER"
prompt: "Enter Admin Username"
private: no
- name: "PASS"
prompt: "Enter Admin Password"
private: yes
tasks:
- name: "Get the current values of all Servers"
delegate_to: localhost
register: listofservers
check_mode: no
uri:
validate_certs: "no"
user: "{{USER}}"
password: "{{PASS}}"
url: "https://console.exmaple.com/adminapi/serverlist"
method: "GET"
body_format: "json"
return_content: "no"
status_code: "200"
- name: Print json dictionary
debug:
var: listofservers.json
Output
TASK [Print json dictionary] *****************************************************************************************
ok: [centalServer.example.com] =>
{
"listofservers.json": {
"serverlist": [
{
"id": 1,
"servername": "redhat.example.com",
"apachestatus": "running",
"certificate": "no"
},
{
"id": 2,
"servername": "solaris.example.com",
"apachestatus": "down",
"certificate": "yes"
} ] } }

Answer 1

Q: "Change "certificate" value to "yes" for all servers."
A: The task below does the job
- set_fact:
listofservers: "{{ {'json':
{'serverlist': serverlist}} }}"
vars:
serverlist: "{{ listofservers.json.serverlist|
map('combine', {'certificate': 'yes'})|
list }}"
- debug:
var: listofservers.json
give
{
"listofservers.json": {
"serverlist": [
{
"apachestatus": "running",
"certificate": "yes",
"id": 1,
"servername": "redhat.example.com"
},
{
"apachestatus": "down",
"certificate": "yes",
"id": 2,
"servername": "solaris.example.com"
}
]
}
}
Q: "What is the syntax to display a specific JSON element?"
A: There are two main options 1) Ansible filters and 2) json_query, and many variations which depend on the structure of the data and requested query
For example, display first servername where id is equal to 1
- debug:
msg: "{{ listofservers.json.serverlist|
selectattr('id', 'eq', 1)|
map(attribute='servername')|
first }}"
gives
"msg": "redhat.example.com"
The same result will give json_query below
- debug:
msg: "{{ listofservers.json.serverlist|
json_query('[?id == `1`].servername')|
first }}"