You can do this by typing the API .
More conveniently, in the env var installed before the build, you will find BUILD_URL:
BUILD_URL=https://jenkins-server.tld/job/JOBNAME/BUILD_NUMBER
So you just need to add / api / json. You can also get it in xml:
<freeStyleBuild> <action> <cause> <shortDescription>Started by user kenji</shortDescription> <userName>kenji</userName> </cause> </action> <action/> <action/> <action> <failCount>0</failCount> <skipCount>0</skipCount> <totalCount>1</totalCount> <urlName>testReport</urlName> </action> <building>false</building> <duration>9772</duration> <fullDisplayName>JOBNAME #4</fullDisplayName> <id>2011-08-10_11-19-42</id> <keepLog>false</keepLog> <number>4</number> <result>SUCCESS</result> <timestamp>1312967982296</timestamp> <url>https://jenkins-server.tld/job/JOBNAME/4/</url> <builtOn>macboo</builtOn> <changeSet> <kind>svn</kind> <revision> <module>https://svn-server.tld/JOBNAME/trunk</module> <revision>7</revision> </revision> </changeSet> </freeStyleBuild>
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