How to prevent Jinja2 substitution in Ansible playbook?

Question

In my playbook, a JSON file is included using the include_vars module. The content of the JSON file is as given below:

{
  "Component1": {
    "parameter1" : "value1",
    "parameter2" : "value2"
  },

  "Component2": {
    "parameter1" : "{{ NET_SEG_VLAN }}",
    "parameter2": "value2"       
  }
}

After the JSON file is included in the playbook, I am using uri module to sent an http request as given below:

- name: Configure Component2 variables using REST API
  uri:
      url: "http://0.0.0.0:5000/vse/api/v1.0/config/working/Component2/configvars/"
      method: POST
      return_content: yes
      HEADER_x-auth-token: "{{ login_resp.json.token }}"
      HEADER_Content-Type: "application/json"
      body:  "{{ Component2 }}"
      body_format: json

As it can be seen, the body of the http request is send with the JSON data Component2. However, Jinja2 tries to substitute the {{ NET_SEG_VLAN }} in the JSON file and throws and undefined error. The intention is not to substitute anything inside the JSON file using Jinja2 and send the body as it is in http request.

How to prevent the Jinja2 substitution for the variables included from the JSON file?

Answer 1

You should able to escape the variable even with {{'{{NET_SEG_VLAN}}'}} to tell jinja not to template anything inside that block.