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}"`);
    }
  }
}];