Another helpful nugget in the JMeter plugin's project is the JSON Path Extractor element. This makes working with JSON pure bliss. It helps extract data out of a JSON response using JSONPath syntax (http://goessner.net/articles/JsonPath/index.html#e2). For complex JSON structures, using JMeter's bundled XPath Extractor can sometimes lead to heartache when trying to get at targeted elements. Where XPath Extractor fails, JSON Path Extractor shines.
Consider a JSON structure like the following:
{ "store": { "book": [ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "category": "fiction", "author": "Evelyn Waugh", "title": "Sword of Honour", "price": 12.99 }, { "category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "isbn": "0-553-21311-3", "price": 8.99 }, { "category"...