jmeter - how to use extracted value from response in Body Data of another request

Question

I'm trying to use the extracted value in Body Data of another request. I extracted the value using JSON Path Extractor like below

value is extracted from the below response

I used it like this in Body data

  {
    "TransactionId": ${transactionId},
    "Cancelled": false
  }

but this is not working in JMeter it shows the transactionId as ["223"]. I want it to be only 223

score 8 · Accepted Answer · answered Feb 10 '17 at 18:23

We can do this in different ways, but I prefer to use "Jmeter" functionality (better to avoid plugins). For source git link

1. Using "Regular Expression Extractor" post processor.
2. Using "JSON Path PostProcessor" post processor.

"Regular Expression Extractor": Regular Expression Extractor is no of the best functionality.

Regular Expression: "transactionId":"(.+?)" Template: $1$ Match Number: 1

2."JSON Path PostProcessor": I never used this post processor, it's also good. Below is the expression

JSON path Expression : $.transactionId Match Numbers: 1

Please find the Results in Debugger Sampler, in "view Results tree"

I want to write the extracted element to a file. The response JSON is : {"distance":14.518,"distanceUnit":"km","time":11.5,"timeUnit":"min"} In Json Extractor, I have given the variable name as ResponseTime. In BeanShell postprocessor, I am trying to access it as time = vars.get("ResponseTime"); But getting null. Am I doing anything wrong? please suggest — Anushree Acharjee, Oct 06 '17 at 11:28

score 2 · Answer 2 · answered Feb 10 '17 at 06:36

Substitute your $..transactionId JSON Path Expression with this one:

$..transactionId[0]

It should remove these JSON Array brackets and you will see 223 only as the ${transactionId} variable value

See Advanced Usage of the JSON Path Extractor in JMeter article for more tips on working with JSON response types.

Naveen Kumar R B · Answer 3 · 2017-02-10T06:30:46.720

1

In JMeter 3.1 version on-wards, try with following JSON Path expression using JSON Extractor (which is built-in)

JSON Path expression: $.transactionId
Match No: 1

gave me 265 value. with out double quotes, without array symbol.

Json extractor screenshot:

View results tree screenshot

edited Feb 10 '17 at 06:30

answered Feb 10 '17 at 05:59

Naveen Kumar R B

in this case nothing passed in Body Data in both cases in body data it shows like TransactionId":, – Nouman Bhatti Feb 10 '17 at 06:03
no it doesn't form first api call response data has "transactionId": "265", with may code it show in the next api call "transactionId": ["265"], – Nouman Bhatti Feb 10 '17 at 06:17
could you please share the screenshot of your latest trial? Used capital `T & I`. pls check which suites the best in the expression. that might be the issue – Naveen Kumar R B Feb 10 '17 at 06:18
Updated answer. Add `Debug Sampler` and try to verify what is the value being captured in `transactionId` variable. you can use either `jp@gc - JSON Path Extractor` plugin OR `JSON Extractor` builtin – Naveen Kumar R B Feb 10 '17 at 06:37

3 Answers3