Create Jenkins user API token

createUserApiToken.groovy

import hudson.model.User
import jenkins.security.ApiTokenProperty

def username = 'my-username'
def tokens = ['my-api-token']

user = User.get(username, false, Collections.emptyMap())
if (user == null) {
  println "Did not find existing user '${username}', creating it..."
  user = User.get(username, true, Collections.emptyMap())
} else {
  println "Got existing user: ${user}"
}

def apiTokenProperty = user.getProperty(ApiTokenProperty.class)
def existingTokens = apiTokenProperty.getTokenList().collect { it.name }
tokens.each { tokenName ->
  if (!(tokenName in existingTokens)) {
    def newToken = apiTokenProperty.tokenStore.generateNewToken(tokenName)
    println "Created new token named '${tokenName}': ${newToken.plainValue} (copy now because you cannot retrieve this any other way after this)"
  } else {
    println "Token named '${tokenName}' already exists"
  }
}

user.save()