RobotFramework Jinja2 Example

example.json.j2

{
    "Arg1": {{ num_value }},
    "A_List": [
        {% for x in (a_list or []) -%}
        "{{ x }}"{% if not loop.last %},{% endif %}
        {% endfor %}
    ],
    "SomeStaticData": "alajsdlkajdlkajsdlad"
}

ExampleTests.robot

*** Settings ***
Test Setup    Store Suite Directory
Library       ./RF_Jinja.py

*** Keywords ***
Store Suite Directory
  Set Suite Variable  ${SUITE_DIR}               ${CURDIR}
  Log To Console      Suite Dir is ${SUITE_DIR}  level=INFO

*** Test Cases ***
Log Template Output
  ${a_list}=  Create List    Foo  Bar  Baz
  ${output}=  Template File  ${SUITE_DIR}/example.json.j2  num_value=5  a_list=${a_list}
  Log To Console  ${output}

RF_Jinja.py

from __future__ import print_function
from jinja2 import Template
import sys

def template_file(path, **kwargs):
    """
    Evaluate the Jinja2 template at path using the given kwargs as the environment.
    """

    with open(path, 'r') as file_:
        template = Template(file_.read())
    return template.render(**kwargs)

__all__ = [ 'template_file' ]