How to Use Postman Interceptor for Capturing Requests

To use Postman Interceptor, install the Interceptor extension in your Chrome browser and enable it in the Postman app. This lets Postman capture and sync browser cookies and requests, allowing you to test APIs with real browser data seamlessly.

Syntax

The basic steps to use Postman Interceptor include:

• Install Interceptor Extension: Add the Postman Interceptor extension to your Chrome browser.
• Enable Interceptor in Postman: Open Postman app and toggle the Interceptor icon to connect.
• Capture Requests: Once connected, Interceptor captures browser requests and cookies.
• Use Captured Data: Use the synced cookies and requests in your Postman collections for testing.

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1. Install Postman Interceptor from Chrome Web Store
2. Open Postman app
3. Click the Interceptor icon in Postman toolbar
4. Toggle 'Connect' to enable capturing
5. Browse your API in Chrome to capture requests

Example

This example shows how to capture a browser request to an API and use it in Postman:

1. Install and enable Postman Interceptor in Chrome and Postman.
2. Visit an API endpoint in Chrome (e.g., https://jsonplaceholder.typicode.com/posts).
3. Postman Interceptor captures the request and cookies.
4. In Postman, create a new request and select 'Use Interceptor' to send the captured cookies.
5. Send the request in Postman to get the same response as the browser.

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/* Steps to capture and use browser request with Postman Interceptor */
// 1. Enable Interceptor in Postman
// 2. Browse API endpoint in Chrome
// 3. In Postman, create a GET request to the same URL
// 4. Enable 'Use Interceptor' for cookies
// 5. Send request and verify response

GET https://jsonplaceholder.typicode.com/posts
Headers: (auto-filled from Interceptor)

// Response: JSON array of posts

Output

[
  {
    "userId": 1,
    "id": 1,
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum..."
  },
  ...
]

Common Pitfalls

Common mistakes when using Postman Interceptor include:

• Not installing the Chrome extension: The Interceptor app toggle won't work without the browser extension.
• Interceptor not connected: Forgetting to toggle 'Connect' in Postman means no requests are captured.
• Browser and Postman mismatch: Using different browsers or profiles can cause cookie sync issues.
• HTTPS issues: Some secure requests may not be captured if HTTPS interception is blocked.

Always verify the Interceptor icon in Postman is green and connected before testing.

text

/* Wrong way: Not enabling Interceptor connection */
// Postman Interceptor icon is gray
// No requests captured from browser

/* Right way: Enable connection */
// Click Interceptor icon in Postman
// Toggle 'Connect' to green
// Requests start syncing

Quick Reference

Step	Action	Description
1	Install Extension	Add Postman Interceptor from Chrome Web Store
2	Enable Interceptor	Toggle 'Connect' in Postman app toolbar
3	Browse API	Make API calls in Chrome to capture requests
4	Use Captured Data	Send requests in Postman with synced cookies
5	Verify Connection	Ensure Interceptor icon is green and connected

Key Takeaways

Install the Postman Interceptor Chrome extension before enabling it in Postman.

Toggle the Interceptor 'Connect' button in Postman to start capturing browser requests.

Captured cookies and requests sync automatically for seamless API testing.

Ensure the Interceptor icon is green to confirm active connection.

Use Interceptor to test APIs with real browser session data easily.