How to Run a Collection in Postman: Step-by-Step Guide

To run a collection in Postman, open Postman and select the Collections tab. Click the Run button next to your collection to open the Collection Runner, then click Start Run to execute all requests in the collection sequentially.

Syntax

Running a collection in Postman involves these steps:

• Collections tab: Where your saved API requests are grouped.
• Run button: Starts the Collection Runner for the selected collection.
• Collection Runner: Interface to configure and execute the collection.
• Start Run: Executes all requests in order.

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1. Open Postman application
2. Click on the Collections tab on the left sidebar
3. Find your collection and click the Run button (▶️) next to it
4. In the Collection Runner window, optionally set environment, iterations, or data files
5. Click Start Run to execute the collection

Example

This example shows how to run a collection named My API Tests in Postman:

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1. Launch Postman
2. Click Collections tab
3. Locate 'My API Tests' collection
4. Click the Run button next to it
5. In the Collection Runner, click Start Run
6. Observe the requests executing one by one with their status and response times

Output

Collection run completed: 5 requests executed, 5 passed, 0 failed.

Common Pitfalls

• Not selecting the correct environment: This can cause requests to fail if variables are missing.
• Forgetting to click Start Run: Opening the Collection Runner alone does not execute requests.
• Using outdated or incorrect data files: Can cause iteration errors.
• Ignoring request dependencies: Some requests may depend on previous responses; running out of order can cause failures.

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Wrong way:
1. Open Collection Runner
2. Close it without clicking Start Run

Right way:
1. Open Collection Runner
2. Click Start Run to execute

Quick Reference

Step	Action
1	Open Postman and go to Collections tab
2	Find your collection and click Run button
3	Configure environment, iterations, or data if needed
4	Click Start Run to execute all requests
5	View results and logs in the Collection Runner

Key Takeaways

Use the Collections tab to find and run your saved API collections.

Always click the Start Run button in the Collection Runner to begin execution.

Set the correct environment and data files before running to avoid errors.

Monitor the Collection Runner for request status and response details.

Running collections automates multiple API tests in sequence efficiently.