Aws API call for describing codeartifact nugget package

Script
var AWS = require("aws-sdk");

var credentials = new AWS.SharedIniFileCredentials({profile: 'default'});
AWS.config.credentials = credentials;

var codepipeline = new AWS.CodeArtifact({apiVersion: '2018-09-22'});

var params = {
    domain: "string",
    domainOwner: "string",
    repository: "string",
    format: "string",
    namespace: "string",
    package: "string",
    packageVersion: "string",
    maxResults: 0,
    nextToken: "string"
  };

codepipeline.describePackage(params, function(err, data) {
  if (err) console.log(err, err.stack); // an error occurred
  else     console.log(data);           // successful response
});