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End of test

When a test finishes, k6 prints a top-level overview of the aggregated results to stdout.

checks.........................: 50.00% ✓ 4545
data_received..................: 1.3 MB 31 kB/s
data_sent......................: 81 kB 2.0 kB/s
group_duration.................: avg=6.45s min=4.01s med=6.78s max=10.15s p(90)=9.29s p(95)=9.32s
http_req_blocked...............: avg=57.62ms min=7µs med=12.25µs max=1.35s p(90)=209.41ms p(95)=763.61ms
http_req_connecting............: avg=20.51ms min=0s med=0s max=1.1s p(90)=100.76ms p(95)=173.41ms
http_req_duration..............: avg=144.56ms min=104.11ms med=110.47ms max=1.14s p(90)=203.54ms p(95)=215.95ms
{ expected_response:true }...: avg=144.56ms min=104.11ms med=110.47ms max=1.14s p(90)=203.54ms p(95)=215.95ms
http_req_failed................: 0.00% ✓ 0180
http_req_receiving.............: avg=663.96µs min=128.46µs med=759.82µs max=1.66ms p(90)=1.3ms p(95)=1.46ms
http_req_sending...............: avg=88.01µs min=43.07µs med=78.03µs max=318.81µs p(90)=133.15µs p(95)=158.3µs
http_req_tls_handshaking.......: avg=29.25ms min=0s med=0s max=458.71ms p(90)=108.31ms p(95)=222.46ms
http_req_waiting...............: avg=143.8ms min=103.5ms med=109.5ms max=1.14s p(90)=203.19ms p(95)=215.56ms
http_reqs......................: 180 4.36938/s
iteration_duration.............: avg=12.91s min=12.53s med=12.77s max=14.35s p(90)=13.36s p(95)=13.37s
iterations.....................: 45 1.092345/s
vus............................: 1 min=1 max=19
vus_max........................: 20 min=20 max=20

Besides this default summary, k6 can output the results in other formats at the end of the test:

On this pageResult formatRead about...
Custom summaryAggregatedUsing the handleSummary() to make completely custom reports
CSVTime-stamped data pointsWriting results as a CSV file, and the structure of the data
JSONTime-stamped data pointsWriting results as a JSON file, and the structure of the data

The default summary

The end-of-test summary reports details and aggregated statistics for the primary aspects of the test:

  • Summary statistics about each built-in and custom metric (e.g. mean, median, p95, etc).
  • A list of the test's groups and scenarios
  • The pass/fail results of the test's thresholds and checks.
Summary with scenario, groups, checks, and thresholds
Ramp_Up ✓ [======================================] 00/20 VUs 30s
█ GET home - https://example.com/
✓ status equals 200
█ Create resource - https://example.com/create
✗ status equals 201
0% — ✓ 0 / ✗ 45
checks.........................: 50.00% ✓ 4545
data_received..................: 1.3 MB 31 kB/s
data_sent......................: 81 kB 2.0 kB/s
group_duration.................: avg=6.45s min=4.01s med=6.78s max=10.15s p(90)=9.29s p(95)=9.32s
http_req_blocked...............: avg=57.62ms min=7µs med=12.25µs max=1.35s p(90)=209.41ms p(95)=763.61ms
http_req_connecting............: avg=20.51ms min=0s med=0s max=1.1s p(90)=100.76ms p(95)=173.41ms
✗ http_req_duration..............: avg=144.56ms min=104.11ms med=110.47ms max=1.14s p(90)=203.54ms p(95)=215.95ms
{ expected_response:true }...: avg=144.56ms min=104.11ms med=110.47ms max=1.14s p(90)=203.54ms p(95)=215.95ms
http_req_failed................: 0.00% ✓ 0180
http_req_receiving.............: avg=663.96µs min=128.46µs med=759.82µs max=1.66ms p(90)=1.3ms p(95)=1.46ms
http_req_sending...............: avg=88.01µs min=43.07µs med=78.03µs max=318.81µs p(90)=133.15µs p(95)=158.3µs
http_req_tls_handshaking.......: avg=29.25ms min=0s med=0s max=458.71ms p(90)=108.31ms p(95)=222.46ms
http_req_waiting...............: avg=143.8ms min=103.5ms med=109.5ms max=1.14s p(90)=203.19ms p(95)=215.56ms
http_reqs......................: 180 4.36938/s
iteration_duration.............: avg=12.91s min=12.53s med=12.77s max=14.35s p(90)=13.36s p(95)=13.37s
iterations.....................: 45 1.092345/s
vus............................: 1 min=1 max=19
vus_max........................: 20 min=20 max=20
ERRO[0044] some thresholds have failed

Above's an example of a report that k6 generated after a test run.

  • It has a scenario, Ramp_Up
  • The requests are split into two groups:
    • GET home, which has a check that responses are 200 (all passed)
    • Create resource, which has a check that responses are 201 (all failed)
  • The test has one threshold, requiring that 95% of requests have a duration under 200ms (failed)

Summary options

k6 provides some options to filter or silence summary output:

Summary export to a JSON file (Discouraged)

Summary export to a JSON file

k6 also has the --summary-export=path/to/file.json option, which exports some summary report data to a JSON file.

The format of --summary-export is similar to the data parameter of the handleSummary() function. Unfortunately, the --summary-export format is limited and has a few confusing peculiarities. For example, groups and checks are unordered, and threshold values are unintuitive: true indicates the threshold failed, and false that it succeeded.

We couldn't change the --summary-export data format, because it would have broken backward compatibility in a feature that people depended on in CI pipelines. But, the recommended approach to export to a JSON file is to use the handleSummary() function]. The --summary-export option will likely be deprecated in the future.