PL-900 Practice Question: Demonstrate the capabilities of Power Automate
A Power Automate flow uses the 'Parse JSON' action to process incoming webhook data. The flow fails with the error 'Invalid JSON' when the webhook sends data. You review the sample payload used to generate the schema and notice the webhook sometimes includes additional optional fields. What is the most likely cause?
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
✓
The generated schema does not account for all possible fields.
The 'Parse JSON' action uses a schema generated from a sample payload. If the sample did not include optional fields that the webhook sometimes sends, those fields are not defined in the schema, causing the action to fail with 'Invalid JSON'. Option B is incorrect because the flow receives the data before parsing; the issue is with the schema, not timing. Option C is incorrect because the webhook is sending valid JSON—the error occurs only when the JSON contains fields not in the schema. Option D is incorrect because a missing nested object would cause a different error related to missing property, not 'Invalid JSON'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The generated schema does not account for all possible fields.
Why this is correct
Extra fields cause schema mismatch.
- ✗
The flow is trying to parse the JSON before receiving it.
Why it's wrong here
The action runs after receiving.
- ✗
The webhook is not sending a valid JSON payload.
Why it's wrong here
The error is from the parse action, not the webhook.
- ✗
The JSON contains a nested object that is not defined.
Why it's wrong here
Nested objects would still be valid if schema includes them.
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