TypeScript Libraries and Tools Page 4 of 5

Pretext is a tiny (15KB gzipped) zero-dependency TypeScript library that handles text layout, measurement, and rendering entirely outside the DOM. Created by Cheng Lou (React core team, Reason, Midjourney), it delivers up to 500x faster performance than traditional DOM...

The agent analytics platform for monitoring and improving your AI agents in the wild. No more digging through logs, fix agents before users complain.

The Universal Tool Calling Protocol (UTCP) is an open standard, as an alternative to the MCP, that describes how to call existing tools rather than proxying those calls through a new server. After discovery, the agent speaks directly to the tool’s native endpoint (HTTP, gRPC...

PGlite is a WASM Postgres build packaged into a TypeScript client library that enables you to run Postgres in the browser, Node.js, Bun and Deno, with no need to install any other dependencies. It is only 3mb gzipped and has support for many Postgres extensions, including...

Rstest is a testing framework powered by Rspack. It delivers comprehensive, first-class support for the Rspack ecosystem, enabling seamless integration into existing Rspack-based projects.

The MathLive library includes a <math-field> web component that provides an easy-to-use interface for editing math.

Jazz is an open-source framework for building local-first apps, removing 90% of the backend and infrastructure complexity. Get real-time sync, storage, auth, permissions, instant UI updates, file uploads, and more — all on day one.

A production-grade animation library for the web. Free and open source. Create stunning web animations for React, JavaScript and Vue.

wraplet is a small JavaScript/TypeScript framework for projects that work directly with the actual DOM (server-rendered apps, jQuery legacy, multipage sites, plain HTML, etc.).

MCPcat is an analytics platform for MCP server owners 🐱. It captures user intentions and behavior patterns to help you understand what AI users actually need from your tools — eliminating guesswork and accelerating product development all with one-line of code.

A fun, interactive spinner wheel built with React and TypeScript — ideal for random name picking, raffles, giveaways, classroom activities, and more!.

Pdfnative is a next-generation PDF generation library built from the ground up in pure TypeScript. It requires zero runtime dependencies and delivers enterprise-grade PDF compliance including ISO 32000-1 (PDF/A) at four conformance levels.

A framework for building terminal apps, built on OpenTUI + React. Gridland apps work in the browser and terminal.

Animated page transition for major SSR frameworks and browsers, including Safari.

Headless, type-safe, composable tools for building modern web applications that work naturally for developers and reliably for agents.

Rslib is a library development tool that leverages the well-designed configurations and plugins of Rsbuild, empowering library developers to take advantage of the extensive knowledge and ecosystem of webpack and Rspack.

MCP server that finds MCP servers. Discovers, evaluates, and installs 25K+ MCP servers across Official Registry, Glama, and Smithery for any AI client (Claude, Cursor, Cline, Windsurf).

Runtime TypeScript and ESM support for Node.js.

An advanced 3D Gaussian Splatting renderer for Three.js.

Datastar is a lightweight framework for building everything from simple sites to real-time collaborative web applications.

Turn any Agent Skill (SKILL.md) into a callable API via POST /run. Multi-model, stateful, open source.

The best API for running dos programs in browser.

JavaScript library to draw smooth curves and straight lines with your mouse, finger or any pointing device.

VoltAgent is an open-source TypeScript framework that acts as this essential toolkit. It simplifies the development of AI agent applications by providing modular building blocks, standardized patterns, and abstractions.

Corgi is a blazing-fast, fully offline VIN decoder built with TypeScript. Powered by an optimized VPIC database, it delivers comprehensive vehicle information with zero network dependencies and lightning-fast performance across Node.js, browsers, and Cloudflare Workers.