Here’s what annoys me: An API that was working fine yesterday suddenly returns slightly different data today. Maybe a field got renamed from user_id to userId, or an array that used to return 10 items now caps at 5, or timestamps switched from Unix to ISO format. The backend team “forgot” to mention it, and now I’m debugging phantom failures.
What I desperately need is Postman to remember the “shape” of successful responses and automatically flag structural changes. Not just status codes but even the actual response anatomy.
For example: Every time I get a 200 OK, Postman quietly fingerprints the response structure. Next time I run the same request, it compares:
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Did any fields disappear or get renamed?
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Did data types change? (string → number, object → array)
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Did array lengths drastically change?
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Did nested structure shift?
When something changes, instead of a cryptic test failure, I should get: “Hey, this endpoint’s response structure changed since last Tuesday. Field ‘created_at’ is now ‘createdAt’ and the ‘metadata’ object moved inside ‘data’.”
This would turn hours of “why is this broken now?” into seconds of “oh, they changed the API again.”