Bulk create labels from the GitHub Issues page.

create-github-labels.js

/**
 * Create GitHub labels in bulk from the Web Inspector console
 *
 * To use:
 * 
 * 1. Go your GitHub repo’s issues page (e.g. `github.com/my/repo/issues/labels`)
 * 2. Open the Web Inspector console
 * 3. Copy-paste the script below
 * 4. Call `createLabels` with the labels you’d like to add:
 * 
 *    createLabels([
 *      ['bug',     'Something isn’t working', '#0366d6'],
 *      ['wontfix', 'We won’t implement this', '#B60205'],
 *    ])
 * 
 * The script is idempotent and will not overwrite existing labels.
 */

const NEW_LABEL_BUTTON_TEXT = 'New label'
const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))

const findVisiblNewLabelButton = () => {
  const newLabelButtons = document.evaluate(
    `//button[contains(text(), '${NEW_LABEL_BUTTON_TEXT}')]`,
    document,
    null,
    XPathResult.UNORDERED_NODE_ITERATOR_TYPE,
    null,
  )
  let visibleNewLabelButton = newLabelButtons.iterateNext()
  while (visibleNewLabelButton && !visibleNewLabelButton.offsetWidth) {
    visibleNewLabelButton = newLabelButtons.iterateNext()
  }

  if (!visibleNewLabelButton) {
    throw new Error(`Could not find visible “${NEW_LABEL_BUTTON_TEXT}” button`)
  }
  return visibleNewLabelButton
}

const createLabels = (labels = []) => {
  newLabels = labels.filter(
    ([name]) => !document.querySelector(`a.IssueLabel[data-name="${name}"]`),
  )
  if (!newLabels.length) return

  const newLabelButton = findVisiblNewLabelButton()

  const createLabel = async (index = 0) => {
    const [name, description, color] = newLabels[index]
    newLabelButton.click()
    await sleep(10)

    const nameInput = document.querySelector('input[name="label[name]"]')
    const form = nameInput.closest('form')
    const descriptionInput = form.querySelector(
      'input[name="label[description]"]',
    )
    const colorButton = form.querySelector('button#new-label-color')
    const colorInput = form.querySelector('input[name="label[color]"]')

    if (
      !newLabelButton ||
      !nameInput ||
      !descriptionInput ||
      !colorButton ||
      !colorInput
    ) {
      throw new Error('Could not find inputs', {
        newLabelButton,
        nameInput,
        descriptionInput,
        colorButton,
        colorInput,
      })
    }

    nameInput.value = name
    descriptionInput.value = description
    colorButton.click() // Trigger form validation
    await sleep(10)
    colorInput.value = color

    form.querySelector('button[type="submit"]').click()

    await sleep(200)

    if (index < newLabels.length - 1) createLabel(index + 1)
  }

  createLabel()
}

~README.md

Create GitHub labels in bulk from the Web Inspector console

To use:

1. Go your GitHub repo’s issues page (e.g. github.com/my/repo/issues/labels)
2. Open the Web Inspector console
3. Copy-paste the script below
4. Call createLabels with the labels you’d like to add:

   createLabels([
     ['bug',     'Something isn’t working', '#0366d6'],
     ['wontfix', 'We won’t implement this', '#B60205'],
   ])

Note

The script is idempotent and will not overwrite existing labels.