Chain Registry Utils

middleware to be set right after body parser in order to return 4xx error back to the client

rehype plugin to Mminify event handler attributes

Use fluent property chains in lieu of options objects

Light client that connects to Polkadot and Substrate-based blockchains

Chain Registry Client

Express server request handler for React Router

the complete solution for node.js command-line programs

TypeScript utilities for interacting with Netlify Functions

Simple module to split a single certificate authority chain file (aka: bundle, ca-bundle, ca-chain, etc.) into an array, as expected by the node.js tls api.

Platform-agnostic JSX channel engine for CopilotKit (createChannel, Thread, PlatformAdapter, ActionStore).

Repeat-tool-call guard plugin: advisory reminders when an agent loops on identical tool calls

Chainable and immutable HTTP handler for standard Request and Response

@bugsnag/js plugin to report unhandled exceptions in React Native

Simple event emitter

Error handler for use in development and production environments.

Node.js implementation of a proxy server (think Squid) with support for SSL, authentication, upstream proxy chaining, and protocol tunneling.

mdast utility to transform to hast

A custom React Hook that provides a useEventListener.

LangChain.js / LangGraph callback adapter for AgentInspect local execution trees and Evidence workflows