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Dan Kornas (@DanKornas) on X
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Dan Kornas (@DanKornas) on X

Arcjet JS SDK is an open-source (Apache-2.0) JavaScript monorepo that adds runtime security to AI apps, agents and HTTP endpoints. It ships request SDKs for Next.js, Node.js, Bun, Deno, Fastify and NestJS. It also has a Guard API for places with no HTTP request object, such as agent tool calls, MCP handlers, queue workers and background jobs. Built-in checks cover prompt-injection detection, sensitive-information detection (PII, credit cards, custom patterns) and token-bucket, fixed-window or sliding-window rate limits, including token budgets.

TL;DR Open-source Arcjet JS SDK adding guardrails (prompt-injection and PII checks, token-budget rate limits) in front of agent tool calls, MCP handlers and HTTP endpoints.
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Also seen from another angle🛡️ Security →

Organisations named here

  • Arcjet
  • Dan Kornas
  • Model Context Protocol

Technologies named here

  • JavaScript
  • Arcjet JS SDK
  • Arcjet Guard API
  • Next.js
  • Node.js
  • Bun
  • Deno
  • Model Context Protocol
  • Fastify
  • NestJS

Techniques named here

  • Prompt injection detection
  • Sensitive-information detection
  • Rate limiting

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