In order to get rid of the square brackets and quotation marks, instruct JMeter to take the first array member only. This is the possibility that I mentioned earlier. firstName to the = 'Smith')].firstNameĪs you can see, we’re getting. Ok, we filtered out the “not interesting” employees, now let’s get the first name of Mrs. Given that we need to get an element where the “lastName” attribute equals “Smith”, the expression would = 'Smith')]Īlternatively, for better readability you can substitute a wildcard with a parent element name = 'Smith')] We’ll need the following JSON Path syntax elements: get “firstName” where “lastName” is “Smith” - it is also possible using JSON Path filter expressions. If you need to get a value from a JSON response which depends on the other value, i.e. Remember that with this tip, in some cases where there is only one member in the response array, you will get it in square brackets like, providing a zero index that will remove the array identifiers and you’ll have only an “interesting” string value.
Change your JSON Path Expression to include a zero-based index of the result array member: $.firstName.The following JSON structure will be used for all the demonstrations, in case of you would like to replicate one of the examples: reference to get “John” This post covers a bit more advanced scenarios, such as working with arrays, conditional select and a selection of multiple values by a single JSON Path query. The installation process, basic use cases, and syntax have already been covered on our blog in the Using the XPath Extractor in JMeter guide (scroll down to “Parsing JSON” section). It is a handy tool to execute JSON Path expressions against JSON responses and storing the result into a JMeter Variable. a correlation) - is also vital.įor these reasons, the JSON Path Extractor plugin was created. Furthermore, the ability to “read” JSON responses - to be able to check whether the response matches expectations or to extract an important, dynamic part of the response for later reuse (i.e. What does this mean to JMeter users trying to run tests on their website/application that uses JSON?įirst, it will require some extra configuration to be able to correctly send the JSON data (use the HTTP Header Manager to send a “Content-Type” header with the value of “application/json”). The most commonly used data format is JSON (JavaScript Object Notation) - a JavaScript-derived language which consists of name/value pairs that are easily human readable. JMeter Users - A Bit of BackgroundĪn ever increasing number of websites and applications are being built on top of REpresentational State Transfer (aka RESTful) architecture which simplifies the interchange of client and server data.
It details scenarios involving working with arrays, conditional select and a selection of multiple values by a single JSON Path query. This post will expand on our earlier coverage on this blog of the JSON Path Extractor, a JMeter plugin that enables extracting values from JSON responses.
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