How to convert Jenkins UI to Jenkins DSL? - jenkins

I need Jenkins DSL for purpose of code versioning.
I have seen that there is plugin which allows to convert jobs from groovy code to UI.
Since I have all jobs written in Jenkins UI I am wondering if there is some way to do it the other so that I will get groovy scripts from Jenkins UI jobs?

There is a plugin XML Job to Job DSL.
Each Jenkins UI job has config.xml in the file system. I have not used the plugin myself as I have converted Jenkins jobs to script manually.

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Jenkins Fan-In Plug-in Job DSL Configure Block

The Jenkins Fan-In Plugin is not natively supported by the Jenkins Job DSL Plugin.
I need a Job DSL Configure Block to be able to add a Fan-In Plugin to my existing Job DSL groovy scripts.

How to write jenkins pipeline for Jira Release Version parameter

I have freestyle Jenkins job with Jira Release Version Parameter:
I need to migrate this job to use Jenkins pipeline instead of freestyle job. Can somebody give me a piece of pipeline code (in declarative language) which does that?
After some investigation, we figured out that at this moment it is not possible to implement this plugin in the pipeline job.

Jenkins Multibranch Job configuration as a pipeline Job

I have mutibranch job in jenkins. Is there any way i can do the multibranch job configurations in a Jenkinsfile? like branchsource , behaviours etc in multibranch job i want to store as a code
Short answer is NO.
But if you still want it, you can store job xml configuration in Git, and then update job through Jenkins API using a local script or even another Jenkins job. Don't recommend though.

Diffrence between buildflow, multijob and pipeline plugin

what is the difference between buildflow, multijob and pipeline plugin.
If i have jobs need to run on the same node sequentially, which one should i use and why?
I have some parameters that are to be shared by all the jobs. I can do it using multijob and build flow also. which one is preferable?
I am confused.
Use the Pipeline plugin.
From the Build Flow plugin page:
"Deprecated: Users should migrate to https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin"
If you're starting from scratch, the answer is basically the same for the Multijob plugin (prefer the pipeline plugin). The Multijob plugin was created pre-jenkins-2, and the pipeline plugin has implemented much of its functionality. Pipeline is one of the default plugins and is being actively maintained by multiple developers. Here is someone migrating from Multijob to Pipeline in 2016.

Convert Groovy DSL scripts to Jenkinsfiles

I have a rather large project and I'm tasked with converting current Jenkins jobs from DSL Groovy scripts into Jenkins files. Is this done manually or can I automate to some level? I did find some decent info on the Jenkins doc site but this is a mid-stream task so trying to find someone who has been through this before.
https://jenkins.io/doc/book/pipeline/jenkinsfile/

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