The correct JSONPath expression is `$.customers[*].email`. This works because the wildcard `[*]` iterates over every element in the `customers` array, and appending `.email` extracts the email property from each object, giving you all email addresses in a single result. On the CompTIA Data+ DA0-001 exam, this tests your ability to navigate JSON structures using path expressions—a common task when parsing API responses. A frequent trap is forgetting the `$` root reference or using a specific index like `[0]` instead of `[*]`, which would only return the first email. Remember the memory tip: the asterisk acts like a "for each" loop in JSONPath, so think "star means all" to avoid selecting just one element.
DA0-001 Mining and Acquiring Data Practice Question
This DA0-001 practice question tests your understanding of mining and acquiring data. 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 data analyst receives the above JSON snippet from a web API. The analyst needs to extract the email addresses for all customers. Which JSONPath expression should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
$.customers[*].email
Option C is correct because the JSONPath expression `$.customers[*].email` uses the wildcard `[*]` to select all elements in the `customers` array and then accesses the `email` property of each element. This matches the requirement to extract email addresses for all customers from the JSON snippet.
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.
✗
$.customers[0].email
Why it's wrong here
This only retrieves the first customer's email.
✗
$..email
Why it's wrong here
This matches all email properties anywhere in the document, but is less specific.
✓
$.customers[*].email
Why this is correct
This expression selects email from every customer object.
Related concept
Read the scenario before looking for a memorised answer.
✗
$.customers.email
Why it's wrong here
This syntax is incorrect; customers is an array, so bracket notation is needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the deep scan operator `..` with the array wildcard `[*]`, thinking `$..email` will neatly extract all customer emails, but it actually retrieves every `email` property at any depth, including from non-customer objects, leading to incorrect data extraction.
Detailed technical explanation
How to think about this question
JSONPath uses `[*]` as a wildcard selector for all elements in an array, similar to XPath's `*` for XML nodes. The deep scan operator `..` is powerful but can introduce performance overhead and unexpected matches in deeply nested structures, making it risky for precise extraction. In real-world APIs, customer data often resides in arrays, and using `[*]` ensures you iterate over each object without assuming a fixed index or risking recursion into unrelated branches.
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.
Mining and Acquiring Data — This question tests Mining and Acquiring Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: $.customers[*].email — Option C is correct because the JSONPath expression `$.customers[*].email` uses the wildcard `[*]` to select all elements in the `customers` array and then accesses the `email` property of each element. This matches the requirement to extract email addresses for all customers from the JSON snippet.
What should I do if I get this DA0-001 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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