Results output

By default, the k6 run command prints runtime information and general results to stdout.

Standard output

When k6 displays the results to stdout, it will show the k6 logo and the following test information:

• Test details: general test information and load options.
• Progress bar: test status and how much time has passed.
• Test summary: the test results (after test completion).

Test details

execution: local
    output: -
    script: script.js

duration: 1m0s, iterations: -
    vus: 100,  max: 100

• execution: local the k6 execution mode (local or cloud).
• output: - the output of the test results. The default is stdout.
• script: script.js shows the name of the script that is being executed.
• duration: 1m0s the test run duration.
• iterations: - the total number of VU iterations.
• vus: 100 the initial number of VUs that test will start running.
• max: 100 the maximun number of VUs that the test will scale.

Test summary

The test summary provides a general overview of your test result. The summary prints to stdout the status of:

• Built-in metrics and custom metrics.
• Checks and thresholds.
• Groups and tags.

data_received..............: 148 MB 2.5 MB/s
data_sent..................: 1.0 MB 17 kB/s
http_req_blocked...........: avg=1.92ms   min=1µs      med=5µs      max=288.73ms p(90)=11µs     p(95)=17µs
http_req_connecting........: avg=1.01ms   min=0s       med=0s       max=166.44ms p(90)=0s       p(95)=0s
http_req_duration..........: avg=143.14ms min=112.87ms med=136.03ms max=1.18s    p(90)=164.2ms  p(95)=177.75ms
http_req_receiving.........: avg=5.53ms   min=49µs     med=2.11ms   max=1.01s    p(90)=9.25ms   p(95)=11.8ms
http_req_sending...........: avg=30.01µs  min=7µs      med=24µs     max=1.89ms   p(90)=48µs     p(95)=63µs
http_req_tls_handshaking...: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s
http_req_waiting...........: avg=137.57ms min=111.44ms med=132.59ms max=589.4ms  p(90)=159.95ms p(95)=169.41ms
http_reqs..................: 13491  224.848869/s
iteration_duration.........: avg=445.48ms min=413.05ms med=436.36ms max=1.48s    p(90)=464.94ms p(95)=479.66ms
iterations.................: 13410  223.498876/s
vus........................: 100    min=100 max=100
vus_max....................: 100    min=100 max=100

To learn more about the metrics k6 collects and reports, read the Metrics guide.

Output of trend metrics

Trend metrics collect trend statistics (min/max/avg/percentiles) for a series of values. On stdout they are printed like this:

http_req_duration..........: avg=143.14ms min=112.87ms med=136.03ms max=1.18s    p(90)=164.2ms  p(95)=177.75ms

You could use the summary-trend-stats option to change the stats reported for Trend metrics.

$ k6 run --summary-trend-stats="avg,p(99)" script.js

Output plugins

k6 can send more granular result data to different outputs to integrate and visualize k6 metrics on other platforms.

The list of output plugins are:

Multiple outputs

You can simultaneously send metrics to several outputs by using the CLI --out flag multiple times, for example:

$ k6 run \
    --out json=test.json \
    --out influxdb=http://localhost:8086/k6

Summary export

Additionally, the k6 run command can export the end-of-test summary report to a JSON file that includes data for all test metrics, checks and thresholds.

This is useful to get the aggregated test results in a machine-readable format, for integration with dashboards, external alerts, etc.

$ k6 run --summary-export=export.json script.js

Read more about the summary on the JSON plugin documentation