insomnia/plugins/insomnia-plugin-uuid/index.js

const uuid = require('uuid');

module.exports.templateTags = [
  {
    displayName: 'UUID',
    name: 'uuid',
    description: 'generate v1 or v4 UUIDs',
    args: [
      {
        displayName: 'Version',
        type: 'enum',
        options: [
          { displayName: 'Version 4', value: 'v4' },
          { displayName: 'Version 1', value: 'v1' }
        ]
      }
    ],
    run(context, uuidType = 'v4') {
      if (typeof uuidType === 'number') {
        uuidType += '';
      } else if (typeof uuidType === 'string') {
        uuidType = uuidType.toLowerCase();
      }

      switch (uuidType) {
        case '1':
        case 'v1':
          return uuid.v1();
        case '4':
        case 'v4':
          return uuid.v4();
        default:
          throw new Error(`Invalid UUID type "${uuidType}"`);
      }
    }
  }
];