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Stress test your http endpoint in a cool way



npm i -g stresser

For legacy v1 documentation please go here


After installing and configuring you can simply run:


The options are:

Usage: stresser <URL> [options]

        -h | --help
            Outputs this helpful information

        -t | --timeout= <milliseconds> [10000]
            Sets the time a request waits for response

        -n | --count= <number> [10]
            Sets the number of seconds

        -c | --concurrent= <number> [100]
            Sets the number of concurrent requests

        -m | --method <GET|HEAD|POST|PUT|DELETE|*> [GET]
            Sets the request method

        -b | --body <body as string>
            Sets body of the request (JSON)

        -f | --force
            Forces the stress test to stop at the requested time even if requests have not finished

        -v | --verbose <e|b|c>
            Sets verbosity
                - e: Errors
                - c: HTTP Status Codes
                - b: HTTP body

        --html=<path/to/report/file.html> [${path.join(__dirname, 'report', `report-${}.html`)}]
            Outputs an HTML report file to location
            Set --html=false if you want to disable it

        --threads=<number> [#cpus]
            The number of cpus that will be used to stress test


stresser -c 10000 -n 10 -t 20000 --html=/home/reports/report-$(date +%s).html --threads=16 --force

Reading the stats


  S=    10 |   T=    96 |   A=     0
  E=     0 | T/O=    96 | W/B=     0 | AVG=     0 | MIN=     0 | MAX=     0
1xx=     0 | 2xx=     0 | 3xx=     0 | 4xx=     0 | 5xx=     0


  • S = Number of Seconds since the test was started
  • T = Number of requests completed in the given amount of time
  • A = Number of requests active (still awaiting a response)
  • E = Number of requests failed
  • T/O = Number of requests timed out
  • W/B = Number of requests that contain a response body
  • AVG = Average response time in milliseconds
  • MIN = Minimum response time in milliseconds
  • MAX = Maximum response time in milliseconds
  • 1xx = Number of HTTP code 100-199 responses
  • 2xx = Number of HTTP code 200-299 responses
  • 3xx = Number of HTTP code 300-399 responses
  • 4xx = Number of HTTP code 400-499 responses
  • 5xx = Number of HTTP code 500-599 responses
  • NOT FINISHED = Number of requests that are unanswered and have been forcefully terminated (see option --force)

HTML output

The HTML file contains:

  • Aggregated stats described above
  • A bar chart with distribution of the response times
  • A line chart with second by second stats


For bugs and/or feature requests please refer to the Github page.


  • Implement option to send custom headers and custom body payload
  • Add pie chart with different http codes distribution
  • Implement a slave / master system in order to stress test from multiple machines, for tests big enough (10k+) where the hardware becomes a bottleneck


stresser is offered under MIT license. Please refer to this page for more info.