jsme

JSME, or JavaScript Molecular Editor, is a browser-based 2D chemical structure editor implemented in JavaScript. It originated as a port of the Java-based editor JME (Java Molecular Editor) to run directly in web pages without requiring plugins, making it easier to embed interactive molecule drawing tools in online resources.

The editor provides an interactive drawing environment for constructing molecular structures. Users can add atoms and bonds, adjust bond orders, create rings and rings templates, and apply aromaticity. It supports common drawing operations such as selecting, moving, and editing atoms and bonds, along with basic stereochemistry indicators and simple editing commands. The interface is designed to be usable within web pages as a self-contained widget, with typical features like zoom, undo/redo, and keyboard shortcuts.

For interoperability, JSME typically offers input and output options to common chemical formats. It can import structures from formats such as SMILES and export to SMILES or Molfile-compatible representations in many implementations. This enables integration with cheminformatics toolchains, database searches, and educational apps that rely on machine-readable representations of drawn structures.

As open-source software, JSME is intended to be embedded in web applications to provide users with in-browser molecule drawing without server-side processing or plugins. It is commonly used in educational sites, online chemical editors, and lightweight cheminformatics demonstrations where client-side structure editing is advantageous. JSME complements the legacy JME project by offering a JavaScript-based solution for modern web environments.