How do you debug API requests in Postman?

The Postman Console shows all network traffic, logs, and script output.

What it shows:

• ✓Full request URL (with query params)
• ✓Request headers sent
• ✓Response headers received
• ✓Script console.log output
• ✓Errors and warnings

// In Pre-request Script or Tests
console.log("Base URL:", pm.environment.get("base_url"));
console.log("Request body:", pm.request.body);
console.log("Response status:", pm.response.code);
console.log("Response body:", pm.response.json());

All output appears in the Postman Console.

Before sending, click the Preview button in the Request Builder to see the exact URL being constructed:

GET https://api.example.com/users?page=2&limit=10
Headers: Content-Type: application/json

After sending:

• ✓Body tab → Formatted JSON/XML or Raw text
• ✓Headers tab → All response headers
• ✓Cookies tab → Response cookies
• ✓Test Results tab → Which tests passed/failed
• ✓Response time → Duration in ms
• ✓Response size → Payload size

// Use test assertions to surface debugging info
pm.test("Debug: Check response structure", function () {
    const json = pm.response.json();
    console.log("Full response:", JSON.stringify(json, null, 2));
    pm.expect(json).to.be.an("object"); // always passes, just for logging
});

Postman Interceptor (browser extension) captures requests from your browser and sends them to Postman for inspection and replay.