Retrieve parameter from a Jenkins REST query

Question

The following REST query will return parameters of the last successful build of a job: https://localhost/job/test1/lastSuccessfulBuild/api/json
I\'d be interested to

Answer 1

Yeah you can get the value,But it will only work for XML API :(
The JSON API will return a simplified json object using Tree :)

So Jenkins provides you with api (XML,JSON,PYTHON) from which you can read the Jenkins related data of any project. Documentation in detail is provide in https://localhost/job/test1/lastSuccessfulBuild/api

In that it clearly states that

1. XML API - Use XPath to control the fragment you want.For example, ../api/xml?xpath=//[0]

2. JSON API - Use tree

3. Python API - Use st.literal_eval(urllib.urlopen("...").read())

All the above can be used to get a specific fragment/piece from the entire messy data that you get from the API.

In your case, we will use tree for obvious reasons :)

Syntax : tree=keyname[field1,field2,subkeyname[subfield1]]

In order to retrieve BUILD_VERSION i.e. value

//jenkins/job/myjob/../api/json?tree=lastSuccessfulBuild[parameters[value]]

The above should get you what you want, but a bit of trail and error is required :)

You can also refer here for a better understanding of how to use Tree in JSON API https://www.cloudbees.com/blog/taming-jenkins-json-api-depth-and-tree

Hope it helps :)