Is there a method for jinja2 to raise an exception when we pass a variable that is not present in the template?
PS: This is different(or opposite) from raising an exception when a variable is present in the template but it is not passed. For this I use "undefined=StrictUndefined"
When you load your jinja2.Environment, set the 'undefined' parameter to 'jinja2.StrictUndefined', e.g.:
env = jinja2.Environment(loader=<someloader>, undefined=jinja2.StrictUndefined) You can catch and examine the render exception to see what was missing
EDIT It would help if I read your full question. :)
Maybe this could help you https://jinja.palletsprojects.com/en/2.11.x/api/#the-meta-api
>>> from jinja2 import Environment, meta >>> env = Environment() >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}') >>> meta.find_undeclared_variables(ast) set(['bar']) You can also do that:
from jinja2 import Template, StrictUndefined Template('name: {{ name }} , city: {{ city }}',undefined=StrictUndefined).render(**{"name":"foo","city":"bar"}) 
Environment response. We use the one to discover the tokens but the other to actually render the content.