To select a single element or a data subset from a complex data structure in JSON format (for example, Ansible facts), use the :ansplugin:`community.general.json_query filter <community.general.json_query#filter>`. The :ansplugin:`community.general.json_query#filter` filter lets you query a complex JSON structure and iterate over it using a loop structure.
..note:: You must manually install the **jmespath** dependency on the Ansible controller before using this filter. This filter is built upon **jmespath**, and you can use the same syntax. For examples, see `jmespath examples <http://jmespath.org/examples.html>`_.
Consider this data structure:
..code-block:: yaml+jinja
{
"domain_definition": {
"domain": {
"cluster": [
{
"name": "cluster1"
},
{
"name": "cluster2"
}
],
"server": [
{
"name": "server11",
"cluster": "cluster1",
"port": "8080"
},
{
"name": "server12",
"cluster": "cluster1",
"port": "8090"
},
{
"name": "server21",
"cluster": "cluster2",
"port": "9080"
},
{
"name": "server22",
"cluster": "cluster2",
"port": "9090"
}
],
"library": [
{
"name": "lib1",
"target": "cluster1"
},
{
"name": "lib2",
"target": "cluster2"
}
]
}
}
}
To extract all clusters from this structure, you can use the following query: