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JSONPath
========
Gabbi makes extensive use of JSONPath to provide a tool for
validating response bodies that are formatted as JSON and making
reference to that JSON in subsequent queries. `jsonpath_rw`_ is used
to process the JSONPath expressions.
To address a common requirement when evaluting JSON responses, an
extension has been made to the default implementation of JSONPath.
This extension is ``len`` and will return the length of the current
datum in the JSONPath expression.
Here is a simple JSONPath example, including use of ``len``. Given JSON data
as follows::
{
"alpha": ["one", "two"],
"beta": "hello"
}
it is possible to get information about the values and length as
follows::
response_json_paths:
# the dict has two keys
$.`len`: 2
# The elements of the alpha list
$.alpha[0]: one
$.alpha.[1]: two
# the alpha list has two items
$.alpha.`len`: 2
# The string at beta is hello
$.beta: hello
# The string at beta has five chars
$.beta.`len`: 5
There are more JSONPath examples in :doc:`example`.
.. _jsonpath_rw: http://jsonpath-rw.readthedocs.org/en/latest/
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