Flow creation in Postman - Build an Automation Script

Create and run a simple Postman flow to send a GET request and verify response

Preconditions (3)

Step 1: Open Postman and click on 'Flows' tab

Step 2: Click 'Create Flow' button

Step 3: Drag and drop a 'Request' node onto the canvas

Step 4: Configure the Request node with method GET and URL 'https://jsonplaceholder.typicode.com/posts/1'

Step 5: Drag and drop a 'Test' node onto the canvas

Step 6: Connect the Request node output to the Test node input

Step 7: In the Test node, add a test script to verify the response status code is 200

Step 8: Click 'Run' button to execute the flow

✅ Expected Result: The flow runs successfully, sending the GET request and the test node verifies the response status code is 200, showing a pass result

Automation Requirements - Postman Flows

Assertions Needed:

Verify response status code is 200

Best Practices:

Use clear and descriptive node names

Connect nodes logically to represent flow

Use built-in test scripts for assertions

Keep flow simple and modular

Automated Solution

Postman

const pm = require('postman-collection');

// Create a new flow
const flow = new pm.Flow({
  name: 'Simple GET Request Flow'
});

// Create a request node
const requestNode = flow.addNode('Request', {
  method: 'GET',
  url: 'https://jsonplaceholder.typicode.com/posts/1'
});

// Create a test node
const testNode = flow.addNode('Test', {
  testScript: `pm.test('Status code is 200', function () {
    pm.response.to.have.status(200);
});`
});

// Connect request node to test node
flow.connect(requestNode, testNode);

// Run the flow
flow.run().then(() => {
  console.log('Flow executed successfully');
}).catch(err => {
  console.error('Flow execution failed:', err);
});

This script creates a Postman flow programmatically.

First, it creates a new flow named 'Simple GET Request Flow'.

Then, it adds a Request node configured to send a GET request to the specified URL.

Next, it adds a Test node with a test script that checks if the response status code is 200.

The Request node is connected to the Test node to ensure the test runs after the request.

Finally, the flow is executed with flow.run(), and success or failure is logged.

This approach follows best practices by keeping nodes clear and connecting them logically.

Common Mistakes - 3 Pitfalls

Not connecting the Request node to the Test node

Hardcoding URLs without using variables

Writing test scripts outside the Test node

Bonus Challenge

Now add data-driven testing with 3 different URLs to send GET requests and verify status 200

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