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LLM security basics for web developers

Prompt injection, secret leakage, and unsafe HTML — what to watch when AI touches your product.

Published · Updated · 13 min read

Never trust model output as code truth

Sanitize HTML. Do not eval model text. Treat tool calls like untrusted user input.

Keep secrets off the prompt

API keys belong in server env vars. Pasting secrets into chat logs is an incident waiting to happen.

Prompt injection is social engineering

If your app forwards user content into a system prompt, attackers will try to override instructions. Isolate privileges and validate actions server-side.

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