Move JIRA issues between instances & projects

moveIssues.js

/**
 * 1. Open the old JIRA instance and create a search showing the issues to export.
 *     Click on _Export > Export Excel CSV (all fields)_.
 * 2. Open the new JIRA instance and create a sample issue in it with the fields filled in
 *     to provide default values for the issues to be imported. Filter for this issue
 *     in search and export it as above.
 * 3. Open https://www.papaparse.com/demo and open the Console from Developer Tools.
 *     Execute the following code:
 */
const { data: oldIssues } = Papa.parse(OLD_JIRA_CSV_STRING, { header: true })
const { data: [sampleIssue] } = Papa.parse(NEW_JIRA_CSV_STRING, { header: true })
const newIssues = oldIssues.map(
  issue => Object.entries(sampleIssue)
    .reduce((acc, [key, defaultValue]) => ({
      ...acc,
      [key]: (issue[key] === undefined) ? defaultValue : issue[key]
    }), {})
)
Papa.unparse(newIssues)
// The output should be a CSV string to import into the new JIRA.