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Developer friendly load testing framework

Project description


When browsing the web with the Developer Tools open you can record the Network Activities (requests perform by your browser & responses you get from servers). Then you can export all these data into an HAR file (Http ARchive). With har2locust you can convert HAR file into valid python code that reproduce the requests perform by your browser.

Here's an example of the auto-generated output

har2locust builds upon har2py, modified to generate a locustfile instead of a basic Python file.

Note: It is currently in early beta. It mostly works, but there may be changes to behaviour and interface without notice. If you encounter an issue, PRs are very welcome.


pip install har2locust

This will also install locust and locust-plugins, because they are needed to run the generated locustfiles.


  1. Navigate the web with your browser while recording your activity. Then save the data in HAR file. Here is an example with Chrome Devs Tools har.gif

  2. Run har2locust myharfile.har >

> har2locust --help
usage: har2locust [-h] [-t TEMPLATE] [-p PLUGINS] [-f FILTERS] [--version] [--loglevel LOGLEVEL] input

positional arguments:
  input                 har input file

  -h, --help            show this help message and exit
  -t TEMPLATE, --template TEMPLATE
                        jinja2 template used to generate locustfile. Default to locust.jinja2. Will check current
                        directory/relative paths first and har2locust built-ins second
  -p PLUGINS, --plugins PLUGINS
                        Comma separated list of extra python files to source, containing a method decorated with
                        @ProcessEntries for processing har-entries before generating the locustfile
  -f FILTERS, --filters FILTERS
                        Commas separated list of resource types to be included in the locustfile. Supported type are
                        `xhr`, `script`, `stylesheet`, `image`, `font`, `document`, `other`. Default to
  --version, -V         show program's version number and exit
  --loglevel LOGLEVEL, -L LOGLEVEL

Example usage: har2locust myrecording.har --plugins >
  1. You can define "plugins" to process your input using the ProcessEntries decorator. The plugin is used by default, and serves as an example for how to make your own.

  2. har2locust also reads two files, .urlignore and .headerignore (from your current directory). Populate them with regexes to filter any unwanted requests or headers from your recordings. Some headers are always ignored (cookie, content-length and chrome's "fake" headers) Here are some examples: .urlignore, .headerignore

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