Need multi project picker

[Garden16_]

I would like to create a custom  field that picks up multiple projects in JIRA. Out of the box JIRA offers only single Project picker. How do I pick up multiple project from my custom fields . Please advice . I am using the following code in script runner for the single project picker 

setFieldByName("Project picker ").convertToMultiSelect([

    ajaxOptions: [

        url           : getBaseUrl() + "https://",

        query         : true,

        formatResponse: "general"

    ]

])

[OpsTech Support]

Hi there,

I saw this request for a multi-project picker custom field, it's a very common need since Jira only offers a single Project Picker out of the box.

We have an app on the Atlassian Marketplace called Multi Project Picker Fields that solves this exactly:

- Select multiple projects in one custom field  
- Fully Forge-based → more secure and native feel  
- Works in issue view, create, edit, transitions, and bulk edit
- Field context configuration (filter by category/type or specific projects)  
- Native JQL support + clickable projects in read-only view  
- Shows “Archived” or “Not found” labels when needed  

It’s a clean, modern solution for use cases like cross-project dependencies, affected projects, or portfolio tracking.

You can try it here:  
https://marketplace.atlassian.com/apps/1488462522/multi-project-picker-fields

Full documentation and setup guide:  
https://opstech-apps.atlassian.net/wiki/spaces/MPF/overview

Happy to answer any questions if you give it a spin!

Cheers,
OpsTech Apps Support

[Nic Brough -Adaptavist-]

This cannot possibly work.

A select list holds a single item.  Converting the UI to a multi-select just makes the data the UI tries to store in the field totally incompatible with it. 

You will need to write an app that can provide your new field type.