A new JavaScript client library, Elasticsearch.js, has been released to extend Elasticsearch's suite of client libraries for PHP, Ruby, Python, and Perl, enabling users to interact with the Elasticsearch REST API from both Node.js and modern browsers. Designed to integrate seamlessly with clusters, automatically discover nodes, manage node failures, and be easily customizable, the library is licensed under Apache 2.0 and available on GitHub. Installation for Node.js is facilitated via npm, while browser builds are tailored for use with jQuery, Angular, or standalone projects. Elasticsearch.js allows for flexible client configuration and supports API calls, including cluster health checks and document indexing, with options for callback functions and promises. The release is currently in beta, inviting feedback and contributions on GitHub, with future plans for performance audits and potential integration with ORM modules like Mongoose or Bookshelf.