EX294 Transform data with filters and plugins Practice Question
This EX294 practice question tests your understanding of transform data with filters and plugins. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A playbook uses the 'uri' module to query an API and registers the result. The API returns a JSON with a nested field 'data.users[0].name'. Which expression correctly extracts that name?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
{{ result | json_query('data.users[0].name') }}
Option D is correct because the `json_query` filter uses JMESPath syntax, which requires dot-separated indices (e.g., `data.users[0].name`) and the query string must be quoted. The `uri` module registers the JSON response as a dictionary, so `result` is the top-level object. The expression `{{ result | json_query('data.users[0].name') }}` correctly applies the JMESPath query to extract the nested field.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
{{ result | json_query('data.users.0.name') }}
Why it's wrong here
JMESPath uses brackets for indexing, not dot.
✗
{{ result | json_query("data.users[0].name") }}
Why it's wrong here
Same as A but with double quotes; A is correct as written.
✗
{{ result.data.users[0].name }}
Why it's wrong here
This works without json_query if result is already parsed, but the filter is specifically json_query.
✓
{{ result | json_query('data.users[0].name') }}
Why this is correct
Correct JMESPath expression.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the distinction between Jinja2 native dot notation (which requires the data to be already parsed into a dictionary) and the `json_query` filter (which uses JMESPath syntax), leading candidates to pick option C when the response is still a raw HTTP object.
Detailed technical explanation
How to think about this question
The `json_query` filter leverages the JMESPath library (RFC 9535) for querying JSON structures, which uses bracket notation for array indices (e.g., `[0]`) and dot notation for object keys. When the `uri` module registers a response, `result` contains the full HTTP response object; to access the parsed JSON body, you typically use `result.json`, but `json_query` can also be applied directly to `result` if the response is already a dictionary (Ansible automatically parses JSON responses). A subtle behavior: if the API returns a JSON array at the top level, the JMESPath query must start with `[0]` to access the first element.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: {{ result | json_query('data.users[0].name') }} — Option D is correct because the `json_query` filter uses JMESPath syntax, which requires dot-separated indices (e.g., `data.users[0].name`) and the query string must be quoted. The `uri` module registers the JSON response as a dictionary, so `result` is the top-level object. The expression `{{ result | json_query('data.users[0].name') }}` correctly applies the JMESPath query to extract the nested field.
What should I do if I get this EX294 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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