BLACKBOX — the flight recorder for AI agents. One command to enroll a device, record every Claude Code / MCP tool call into a tamper-evident hash-chained + signed log, anchor it to a public timestamp, ship to a fleet, and verify offline.

efficiently store signed integers in varint

64bit Long Integer on Buffer/Array/ArrayBuffer in Pure JavaScript

A low-level library for generating Ed25519-signed URLs.

AWS SDK for JavaScript Kms Client for Node.js, Browser and React Native

Convert bytes to a human readable string: 1337 → 1.34 kB

Parse HTTP request cookies

Colored symbols for various log levels. Example: `✔︎ Success`

Translation between JavaScript values and Buffers

LEB128 utilities for Node

Generate self signed certificates private and public keys

BigInt-backed decimal arithmetic for ECMA-402 polyfills

Browser-side SDF font generator

A pure javascript CRC32 algorithm that plays nice with binary data

Drop-in structured JSON logging for Node.js and the browser. Zero dependencies. Replaces console.log() with single-line JSON output including stack traces, timestamps, and source file tracking. Works with DataDog, Splunk, LogDNA, OpenSearch, CloudWatch, a

Log by overwriting the previous output in the terminal. Useful for rendering progress bars, animations, etc.

JWT Library for Node.js

Quickly get self signed ssl certificates for development

Create Self Signed Development Certificates

Cookies, optionally signed using Keygrip.