Code to implement locates at https://github.com/2captcha/2captcha-python/blob/08e8e00d39e1f7581df74479e74a8a46a8e1d827/twocaptcha/solver.py#L594 As in documentation: > List of GET request parameters for http://2captcha.com/res.php > > json Integer > Default: 0 No 0 - server will send the response as plain text > 1 - tells the server to send the response as JSON > > Server will return OK_REPORT_RECORDED response to your request. Or an error code if something went wrong.