How to evaluate JSON in Robot Framework

Here is a simple example that will demonstrate how to evaluate JSON in Robot Framework. This can be useful if you are attempting to do some form of API testing that requires you to assert return values.

In our robot file, we will create a JSON variable, and utilize Python's built-in json loader to retrieve the data. Once we get the JSON loaded, we can use the "password" key to verify the expected value. I've added color coding to help show you what parts are matching.

*** Variables ***

${js string}=    {

...                  "random": {

...                       "passwd_change_date": "2016-12-16T11:26:26",

...                       "passwd_fail_count": 0,

...                       "password": "123456789",

...                       "status": 0,

...                       "user_name": "test@test.com"

...                  }

...              }

*** Test cases ***

TC

    &{data}=    Evaluate     json.loads($js_string)    json
    &{data}=    Set variable    &{data}[random]

    Should be equal    &{data}[password]    123456789

Source Reference:

• http://robotframework.org/robotframework/latest/RobotFrameworkUserGuide.html#dictionary-variables
• http://robotframework.org/robotframework/latest/libraries/BuiltIn.html#Evaluate