:police_car_light: The weekly community challenge is live! Share one genuine mistake you have made while using Postman. It could be related to Collections, Environments, Variables, Scripts, Monitors, Mocking or Collaboration. Explain: What you were trying to achieve What went wrong How you rea…

One genuine mistake: “Why Isn’t This Updating?” While working in a shared Collection in Postman, I updated a request test to fix a failing assertion. I ran it again. It still failed. I tweaked it. Ran it again. Still failed. When i was using postman for first time after 10 minutes of debugging, I…

What you were trying to achieve I often use curl to request from CLIs and postman. It’s a convenient method to understand API str. What went wrong I always used to manually paste all the headers, url, payload body. That was seriously a lot of work. How you realised the mistake I still remember,…

That’s classic, I earlier used to just go with headers for auth. But the “Bearer“ vs “bearer“ was the turning point for me. I spent quite nice time on debugging this. Then switched to in-built Auth section.

MCP App + ESP32 + Coffee = Chaos :hot_beverage: Last week I attended a Postman meetup in London about MCP Apps and agentic development. Naturally, I thought: Right. I shall build an MCP App to control my Saeco Vienna via an ESP32. Looks good to me. I followed the MCP Apps docs and built a small UI …

Great practical takeaway too checking the Agent before debugging firmware is such a good lesson. Maybe just one short line explaining why the Cloud Agent can’t resolve local hosts would make it even clearer for newcomers.

Mistake: The “Local Value” Ghost in the New UI What I was trying to achieve: I was setting up a shared Environment for our team’s new Payment API. I added the api_key to the environment variables so my teammates could start testing immediately without needing to hunt for credentials. What went wron…

That silent failure with “NAN” in your billing monitor is a classic nightmare! I actually ran into something similar recently because of the UI updates. It turns out that for Monitors to ‘see’ variables, they must be in the Shared Value column (which you might have to manually enable now via the th…

I liked how you pointed out that the issue wasn’t with the test itself but with Postman running the last saved version. The moment you noticed your fix missing in a new tab clearly showed how easy it is to forget common day to day things. Your takeaway of pressing Ctrl+S before running is a simple b…

Mistake: It Works Manually But Fails in Runner What I was trying to achieve: I was load-testing a paginated API using Collection Runner to fetch multiple pages automatically. What went wrong: Page 1 worked. Every next request returned the same data, even though I was updating the page parameter i…

Mistake: The Test That “Should” Have Changed the Next Request What I was trying to achieve I was using the Collection Runner to validate a simple flow: login, then call a series of authenticated endpoints in sequence. What went wrong Runner kept sending the second request with the old token. I’d…

yes! this local vs shared value thing is so confusing in the new ui I had the same issue where it worked for me but not my teammate. The cloud icon is easy to miss. Thanks for the screenshot, that’s helpful.

💥 $100 Community Challenge – Postman Mistakes That Taught Me Something | 24 Hours Only

API Pulse

danny-dainton (Danny Dainton) February 19, 2026, 10:13am 38

This has been the behaviour in Postman, while using variables, and been part of the docs for many years.

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💥 $100 Community Challenge – Postman Mistakes That Taught Me Something | 24 Hours Only

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