schema.js

var BulkPayloadSchema: {
  actions: Joi.array().required().items(
    Joi.object().keys({
      type: Joi.string().valid('projects', 'pages', 'elements').required(),
      method: Joi.string().valid('create', 'update', 'remove').required(),
      data: Joi.object().keys({
        id: numericSchema.when('method', {
          is: 'create',
          then: Joi.forbidden(),
          otherwise: Joi.required()
        }),
        title: Joi.any().when('type', {
          is: 'projects',
          then: Joi.when('method', {
            is: 'remove',
            then: Joi.forbidden(),
            otherwise: Joi.string().max(256).required()
          }),
          otherwise: Joi.forbidden()
        }),
        projectId: numericSchema.when('type', {
          is: 'pages',
          then: Joi.when('method', {
            is: 'create',
            then: Joi.required(),
            otherwise: Joi.forbidden()
          }),
          otherwise: Joi.forbidden()
        }),
        pageId: numericSchema.when('type', {
          is: 'elements',
          then: Joi.when('method', {
            is: 'create',
            then: Joi.required(),
            otherwise: Joi.forbidden()
          }),
          otherwise: Joi.forbidden()
        }),
        x: Joi.any().when('type', {
          is: 'pages',
          then: Joi.when('method', {
            is: 'remove',
            then: Joi.forbidden(),
            otherwise: Joi.number().integer().required()
          }),
          otherwise: Joi.forbidden()
        }),
        y: Joi.any().when('type', {
          is: 'pages',
          then: Joi.when('method', {
            is: 'remove',
            then: Joi.forbidden(),
            otherwise: Joi.number().integer().required()
          }),
          otherwise: Joi.forbidden()
        }),
        styles: Joi.any().when('type', {
          is: 'projects',
          then: Joi.forbidden(),
          otherwise: Joi.when('method', {
            is: 'remove',
            then: Joi.forbidden(),
            otherwise: Joi.object().required()
          }),
        }),
        attributes: Joi.any().when('type', {
          is: 'elements',
          then: Joi.when('method', {
            is: 'remove',
            then: Joi.forbidden(),
            otherwise: Joi.object().required()
          }),
          otherwise: Joi.forbidden(),
        })
      })
    })
  ).min(1).max(1000)
};