SafePrompt: Prompt Injection Detection API
One Line of Code Stops Attacks
Protect AI automations, workflows, and features from prompt injection and manipulation attacks. Built for developers who ship fast.
What is SafePrompt?
SafePrompt is a prompt injection detection API that validates user inputs before they reach your LLM. It uses a 4-stage pipeline — pattern detection, external reference detection, and two AI validation passes — to block attacks with above 95% accuracy in under 100ms. One API call to integrate, no security expertise required.
How SafePrompt Works
Send a POST request to the SafePrompt API with the user's prompt. SafePrompt runs it through pattern matching (instant), external reference detection (instant), and AI semantic analysis (under 100ms). You get back a JSON response: safe/unsafe, confidence score, detected threats, and processing time.
Who Should Use SafePrompt
SafePrompt is built for indie developers, freelancers, and startups adding AI features to their apps. If your application accepts user input that gets sent to an LLM — chatbots, AI assistants, automated workflows, contact forms processed by AI — you need prompt injection protection. Free tier available.
Open source · MIT licensed · GDPR compliant · OWASP LLM Top 10 aligned
One API Call
Add protection in minutes
# Install
npm install safeprompt
# Use
import SafePrompt from 'safeprompt';
const sp = new SafePrompt({ apiKey: 'YOUR_API_KEY' });
const result = await sp.check(userInput, { userIP: clientIP });
if (!result.safe) {
throw new Error(`Blocked: ${result.threats?.[0]}`);
}See full API reference for batch validation, caching options, and advanced features
View API Docs →Test These Attacks in Our Live Playground
See exactly how these attacks work — and how SafePrompt stops them. No signup required. Just click and learn.
Free • No signup • Educational purposes
How SafePrompt Works
A 4-stage validation pipeline that blocks attacks in milliseconds
Pattern Detection
Known attack signatures
External Refs
URLs, IPs, file paths
AI Pass 1
Fast semantic check
AI Pass 2
Deep analysis
Safe Input
Reaches your LLM
Pattern Detection
Known attack signatures • Most attacks blocked
External Reference Detection
URLs, IPs, file paths • Additional threats caught
AI Validation Pass 1
Fast semantic check • Semantic threats caught
AI Validation Pass 2
Deep analysis • Edge cases
Safe Input
Reaches your LLM • >95% accuracy
Most requests complete in under 100ms. Only 5% need the full pipeline.
When AI Goes Unprotected: Real Incidents
| Company | Outcome |
|---|---|
| Chevrolet | Viral, brand damage, legal exposure |
| Air Canada | Court held company liable for AI's promise |
| Samsung | IP leaked to OpenAI, company-wide AI ban |
| Bing / Sydney | Internal codename & system prompt publicly leaked |
Who Needs SafePrompt?
🚀 Indie Developers
Building an AI feature for your side project? Protect it with one line of code.
Ship fast, sleep sound.
💼 Freelancers Building for Clients
"I added security" sounds way better than "I hope they don't try to hack it."
One API call = professional deliverable.
🏢 Startups Shipping AI Features
Move fast without breaking things. Get enterprise security without the complexity or 6-month sales cycle.
From MVP to millions of users.
🛠️ Dev Teams Adding AI
Everyone on the team can ship AI features securely. No security expertise required.
One API call. That's it.
Simple API, Powerful Features
Built for developers who value simplicity. From side projects to production apps - one endpoint, instant protection.
One Line Integration
POST to /api/v1/validate. No complex setup, works everywhere.
Fast Validation
Lightning-fast pattern detection handles most requests instantly. AI validation provides deep analysis when needed.
Real AI Protection
Not just regex. Multi-layer validation catches attacks that simple filters miss
Batch Processing
Need to validate 100 prompts? One API call. Perfect for testing and CI/CD
Usage Dashboard
See what threats we're blocking, track your usage, monitor performance
Scales With You
From 10 to 10 million requests. Export reports, track usage, ready for compliance when you need it.
💡 Whether you're building a weekend project or a business-critical app, we've got you covered.
Why Developers Choose SafePrompt
Sleep Better at Night
Stop worrying about what users might make your AI reveal or do. We catch attacks before they reach your model.
Don't Slow Down Users
Most requests validated instantly via pattern detection. Your users get security without noticeable delay.
Ship Faster, Worry Less
One API call is all it takes. No complex rules to write, no constant updates to maintain.
Simple, Transparent Pricing
Simple, transparent pricing. Free plan available. No contracts.
Free
For testing and side projects
- 1,000 requests/month
- Full detection engine
- Pattern + AI validation
- Multi-turn detection
- Network defense
- GDPR export/delete
- Priority support
- Intelligence opt-out
Starter
For production apps
- 10,000 requests/month
- Full detection engine
- Pattern + AI validation
- Multi-turn detection
- Network defense
- Priority support
- Intelligence opt-out
- GDPR export/delete
- 99.9% uptime SLA
Protect Your Browser Too
The SafePrompt Chrome Extension detects hidden text injection and prompt hijacking attacks in real-time while you browse — including invisible CSS and zero-width character attacks.
- ✓ Detects hidden text injection in web pages
- ✓ Works on ChatGPT, Claude, Gemini, and more
- ✓ Free to install and use
in your browser
Complete Documentation Available
Get started in minutes with our comprehensive guides, API reference, and code examples for all major languages and frameworks.
Quick Start
Get your first integration running in under 5 minutes
API Reference
Complete API documentation with request/response examples
Installation
Express, Next.js, and HTTP API integration guides
Need help? Contact Support
Don't Wait for Your First Attack
Every day without protection is a day your AI could be compromised. Secure it now with one simple integration.