Joi.object()
    .keys({
        'x-api-key': stringsSchema.awsApiKey.required(),
    })
    .rename(/x-api-key/i, 'x-api-key', {
        // alias: true,
        override: true,
        ignoreUndefined: true,
    })

const Joi = require('joi');

const schema = Joi.object()
    .keys({
        'x-api-key': Joi.string().token().min(30).max(128),
    })
    .rename(/x-api-key/i, 'x-api-key', {
        // alias: true,
        override: true,
        ignoreUndefined: true,
    });

const result = Joi.attempt({
      'x-api-key': 'ABCEFGHIJKLMNOPQRSTUVXYWZabcefghijklmnopqrstuvxywz0123456789'
 }, schema);

console.log(result); // prints { }