ViaCEP API service - NodeJS

viacep.js

const request = require('request');

const promisifiedRequest = function (options) {
    return new Promise((resolve, reject) => {
        request(options, (error, response, body) => {
            if (response) {
                return resolve(response);
            }
            if (error) {
                return reject(error);
            }
        });
    });
};

module.exports = async (cepRawValue, proxyURL = '') => {
    try {
        const CEP_SIZE = 8;
        const cepCleanValue = cepRawValue.toString().replace(/\D+/g, '');
        if (cepCleanValue.length <= CEP_SIZE) {
            const options = {
                url: `${proxyURL}https://viacep.com.br/ws/${cepCleanValue}/json/`,
                method: 'GET',
                mode: 'cors',
                gzip: true,
                headers: {
                    'content-type': 'application/json;charset=utf-8'
                }
            }

            const response = await promisifiedRequest(options);
            if (response.body) {
                const responseObject = JSON.parse(response.body);
                return {
                    cep: responseObject.cep ? responseObject.cep.replace('-', '') : cepCleanValue,
                    state: responseObject.uf,
                    city: responseObject.localidade,
                    neighborhood: responseObject.bairro,
                    street: responseObject.logradouro,
                    complement: responseObject.complemento
                }
            }
        } else {
            return {
                message: `Zip code must contain exactly ${CEP_SIZE} characters.`,
                type: 'validation_error',
                errors: [{
                    message: `Zip code entered is longer than ${CEP_SIZE} characters.`,
                    service: 'cep_validation'
                }]
            }
        }
        return null;
    } catch (error) {
        const serviceError = {
            message: error.message,
            service: 'viacep'
        }

        if (error.name === 'FetchError') {
            serviceError.message = 'Error connecting to ViaCEP service.';
        }
        throw serviceError;
    }
}