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

Answer 1

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.

1. "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"

Answer 2

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.

Answer 3

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