Overview

FlexSearch is a JavaScript full-text search engine designed for both browser and Node.js environments. It targets developers who need instant, high-performance search without relying on external services. The library offers multi-field document search, phonetic transformations, partial matching, tag-based queries, result highlighting, and suggestion generation, all within a single, lightweight package.

Scalable Deployment

Version 0.8 introduces persistent indexes that can be stored in a variety of back-ends—including IndexedDB, Redis, SQLite, PostgreSQL, MongoDB, and ClickHouse—allowing large data sets to be queried efficiently. Parallel workers distribute indexing and query workloads across threads or Web Workers, delivering benchmarked speeds up to a million times faster than many alternatives. The engine supports a broad set of character sets (Latin, CJK, Hindi, Arabic, Cyrillic, Greek, Hebrew), making it suitable for multilingual applications.

Integration

FlexSearch can be imported as an ES module or used with CommonJS, and it works seamlessly with modern frameworks. Community adapters provide ready-made hooks for React (react-use-flexsearch), Vue (vue-use-flexsearch), Gatsby (gatsby-plugin-flexsearch), and static site generators like Nikola. Because the core library is pure JavaScript, it can be bundled with bundlers such as Webpack, Rollup, or Vite, and it respects tree-shaking to keep bundle size minimal. The project is maintained by Antithesis Operations LLC and was nominated by GitNation for Best Technology of the Year.