JMeter - Sampler Result Tab | View Results Tree

The View Results Tree listener of JMeter is invaluable for debugging and verifying test scripts. Within the View Results Tree listener, there are three primary tabs for analyzing a request:

Sampler Result
Request
Response Data

This article focuses on the Sampler Result Tab, which provides a detailed summary of the test request execution. Understanding the data presented here is crucial for diagnosing performance issues, HTTP errors, and other anomalies.

What is the Sampler Result Tab?

The Sampler Result Tab displays metadata about the execution of a particular sampler. It contains vital statistics related to the request’s execution time, success status, thread information, and more.

This tab is especially helpful when you’re trying to:

Analyze performance bottlenecks
Identify request failures
Understand how JMeter is handling responses

Key Fields in the Sampler Result Tab

Here are the commonly available fields in the Sampler Result tab and their usage:

Field	Description
Sample Start	The exact timestamp when the request was sent.
Load time	Time taken (in milliseconds) to complete the request and receive the response.
Connect Time	Time taken to establish a TCP connection to the server (not including SSL handshake).
Latency	Time taken to receive the first byte of the response after the request was sent.
Size in bytes / body size	The total size of the response (header + body or only body, depending on configuration).
Headers size	Size of the response headers in bytes.
Sample Count / Error Count	Number of samples in the group and the number that failed.
Response Code	The HTTP response code (e.g., 200 for success, 404 for not found).
Response Message	A brief message associated with the response code (e.g., “OK”, “Not Found”).
Thread Name	Indicates which thread executed the request.
Data type	Type of response data (e.g., text, binary).
Success	Whether the sampler was successful (`true` or `false`).
URL	The complete request URL.
HTTP method	GET, POST, PUT, DELETE, etc.
Cookies / Keep-Alive / HTTPS	Information about whether cookies were used, keep-alive was on, and if HTTPS was used.

Uses of the Sampler Result Tab

The information provided in this tab is useful for:

Debugging test cases: If a sampler is failing, this tab shows why.
Monitoring performance: Fields like Load time and Latency help identify slow responses.
Verifying response correctness: Ensuring correct HTTP codes and messages are returned.
Analyzing connectivity: Connect Time and Sample Start help detect network issues.
Checking test configuration: Ensuring the request is going to the right URL and uses the expected HTTP method.

Example:

Let’s walk through a simple example of how the Sampler Result tab looks and what it means.

Scenario:

You are testing a login API endpoint using an HTTP Request sampler in JMeter. You’ve configured the request to send a POST request to https://example.com/api/login.

Sample Output in Sampler Result Tab:

Sample Start: 2025-07-03 14:52:20 IST
Load time: 248
Connect Time: 80
Latency: 200
Size in bytes: 712
Headers size: 168
Body size: 544
Sample Count: 1
Error Count: 0
Response code: 200
Response message: OK
Thread Name: Thread Group 1-1
Data type ("text"|"bin"|""): text
Success: true
URL: https://example.com/api/login
HTTP method: POST
Keep-Alive: true

Interpretation:

Sample Start (2025-07-03 14:52:20 IST): The request was triggered at this exact timestamp, useful for log correlation.
Load time (248 ms): The entire request-response cycle took under 250ms, which is efficient.
Connect Time (80 ms): Server responded quickly with minimal connection delay.
Latency (200 ms): The server started sending a response in 200ms, indicating decent backend processing speed.
Size in bytes (712): Total size of response (headers + body), showing moderate payload and metadata.
Headers size (168 bytes): Response header size was minimal, typical for a REST API.
Body size (544 bytes): Indicates a moderate-sized response, likely a JSON payload.
Sample Count (1): This sampling event executed only one request.
Error Count (0): No errors occurred, indicating a successful request.
Response Code 200 / Message OK: The request was successful and the server responded as expected.
Thread Name (Thread Group 1-1): Request was executed by the first thread in the first thread group.
Data type (text): Response body was in a text-based format, most likely JSON or HTML.
Success: true: Confirms that the request passed all checks and validations.
URL (https://example.com/api/login): Confirms the request was sent to the intended login API endpoint.
HTTP method (POST): Shows a data-submitting action was performed, typical for login operations.
Keep-Alive: true: Persistent connection was maintained, reducing overhead for future requests.

From this, we conclude that the login endpoint is performing well under the current test configuration and no obvious issue in the page.

Conclusion

The Sampler Result Tab in JMeter’s View Results Tree listener is a vital and quick tool for understanding the behavior of JMeter requests. Whether you’re troubleshooting a failed request or analyzing response times, this tab offers the essential insights needed for effective performance testing.