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Summary: Learn how to leverage JsonPath filters to specifically target and extract JSON keys starting with 'tag_' in your JSON objects using Ansible.
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Using JsonPath to Filter Keys Starting with 'tag_' in a JSON Object

JSON objects are heavily utilized in modern applications, often carrying nested structures and complex data types. When dealing with extensive JSON data sets, users may find it necessary to filter specific keys to target and process only relevant information. One popular tool to achieve this is JsonPath. Combined with automation tools like Ansible, this technique can considerably streamline and optimize data handling tasks.

What is JsonPath?

JsonPath is a query language for JSON, providing an easy and flexible way to navigate, filter, and transform JSON data structures. Think of it as what XPath is to XML.

Why Filter JSON Keys?

Filtering JSON keys can be immensely useful, especially in scenarios where the JSON object includes many attributes, but you are interested in processing only a subset. This practice can enhance performance and accuracy in data processing tasks.

Filtering Keys Starting with tag_

Suppose you have a JSON object and you want to filter out keys that start specifically with the prefix tag_. Here's a step-by-step approach on how you can achieve this using JsonPath within an Ansible playbook.

Sample JSON Structure

To illustrate the technique, consider the following sample JSON:

[[See Video to Reveal this Text or Code Snippet]]

In this sample, our goal is to filter and extract keys like tag_environment, tag_application, and tag_version.

JsonPath Expression

The JsonPath expression used to filter keys starting with tag_ would look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Using JsonPath in Ansible

Ansible simplifies automation tasks and offers rich support for manipulating JSON data using built-in modules and plugins. Leveraging JsonPath within Ansible involves using the json_query filter. Here’s an example of an Ansible playbook that filters out the desired keys:

[[See Video to Reveal this Text or Code Snippet]]



name: Filter JSON Keys Using JsonPath
hosts: localhost
tasks:

name: Set sample JSON data
set_fact:
my_json: '{"name": "example_data", "tag_environment": "production", "tag_application": "web_server", "id": 12345, "tag_version": "1.0"}'

name: Filter out keys starting with 'tag_'
set_fact:
filtered_data: "{{ my_json | from_json | json_query('tag_*') }}"

name: Display filtered data
debug:
msg: "{{ filtered_data }}"

[[See Video to Reveal this Text or Code Snippet]]