The tojson filter doesn't seem to exist in jinja2 v2.7.1 (the most recent
version I had installed on my system). I upgraded to v2.7.2 and it still
doesn't exist. Attempts to use that filter results in:

jinja2.exceptions.TemplateAssertionError: no filter named 'tojson'


None of the filters.py modules on my system contain any mention of the
"tojson" filter.

Even if that filter existed the documentation you refer to is ambiguous
about how it handles objects which cannot be serialized to JSON. What about
an object with attribute "x" for which "obj.x" is a legal jinja2 template
reference? The repr (i.e., "%r") representation will at least give you the
name of the class which should be helpful in debugging the problem.

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