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General

PromptBeginner5 minmarkdown

Arcjet rules run before the request reaches your AI model — blocking prompt injection

PII leakage

Apr 10, 2026

General

PromptBeginner5 minmarkdown

Check for an existing shared Arcjet client (see `/arcjet:protect-route` for full setup). If none exists

set one up first with `shield()` as the base rule. The user will need to register for an Arcjet account at https://app.arcjet.com then use the `ARCJET_KEY` in their environment variables.

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Arcjet rules run **before** the request reaches your AI model — blocking prompt injection

Check for an existing shared Arcjet client (see `/arcjet:protect-route` for full setup). If none exists

Detects jailbreaks

Read https://docs.arcjet.com/llms.txt for comprehensive SDK documentation covering all frameworks

Secure AI/LLM endpoints with layered protection: prompt injection detection

description: Protect AI chat and completion endpoints from abuse — detect prompt injection and jailbreak attempts

Best practices — legend-first

Add AI protection

Visual symbol table — per ELV system (CCTV

pdfcount

$analysis_of_ai_characteristics (Identify areas that sound robotic

mc

- Sensitive info detection runs **locally in WASM** — no user data is sent to external services. It is only available in route handlers

**Vercel AI SDK**: Arcjet works alongside the Vercel AI SDK. Call `protect()` before `streamText()` / `generateText()`. If denied

**Multiple models / providers**: Use the same Arcjet instance regardless of which AI provider you use. Arcjet operates at the HTTP layer

- `list-requests` — confirm decisions are being recorded

If the user wants a full security review

Adapt the response format to your framework (e.g.

console.warn(Arcjet error:

sensitiveInfoValue: userMessage

detectPromptInjectionMessage: userMessage

return Response.json({ error: Forbidden }

const decision = await aj.protect(req

requested: 1

Arcjet rules run before the request reaches your AI model — blocking prompt injection

- Sensitive info detection runs locally in WASM — no user data is sent to external services. It is only available in route handlers

Vercel AI SDK: Arcjet works alongside the Vercel AI SDK. Call `protect()` before `streamText()` / `generateText()`. If denied

Multiple models / providers: Use the same Arcjet instance regardless of which AI provider you use. Arcjet operates at the HTTP layer