DA0-002 Data Acquisition and Preparation Practice Question
Exhibit
Refer to the exhibit.
{
"customers": [
{"id": 1, "name": "John Doe", "email": "john@example.com"},
{"id": 2, "name": "Jane Smith", "email": "jane@example.com"}
],
"status": "success"
}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?
⚠ Common exam trap
Many exam-takers 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.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
$.customers[*].email
The JSONPath expression `$.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.
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.
- ✗
$.customers.email
Why it's wrong here
This syntax is incorrect; customers is an array, so bracket notation is needed.
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