how to extract json response data in jmeter using regular expression extractor?
Is authorizationToken appearance unique in response (does it appear only once)?
If it does you may simply use Regular Expression Extractor added to the HTTP Request which returns json response, with regex like following:
HTTP Request Regular Expression Extractor Reference Name: authToken Regular Expression: "authorizationToken":"(.+?)" Template: $1$ Match No.: 1and refer further extracted value as ${authToken}.
But if your case is more complicated and there several appearances of authorizationToken in json response and you have to extract concrete one you may use e.g. BeanShell PostProcessor / BSF PostProcessor added to the same HTTP Request to extract value with beanshell code + json processing library.
If not - the first solution above should help.
UPDATE:
At the moment the most comfortable way to process JSON responses seems to be custom JSON utils for jmeter (JSON Path Assertion, JSON Path Extractor, JSON Formatter) which are also part of Jmeter Plugins.
In this particular case you can use JSON Path Extractor.