llm-guard
A TypeScript library for validating and securing LLM prompts
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is llm-guard?
llm-guard is a TypeScript library designed to validate and secure Large Language Model (LLM) prompts, ensuring they are safe and appropriate before processing.
Key differentiator
“llm-guard stands out as the only TypeScript library specifically designed for validating and securing prompts intended for Large Language Models, offering developers a robust solution to ensure their applications are both secure and compliant.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
The primary development is in TypeScript, and while there's a community-maintained Python SDK, it lacks the depth of official support.
Integrating llm-guard into projects that are not primarily built in TypeScript can be cumbersome due to a lack of comprehensive documentation and tooling outside of the TypeScript ecosystem.
Version updates from v0.1 to v0.2 required significant refactoring, indicating instability in API design which can disrupt ongoing projects.
While basic usage is well-documented, detailed explanations and examples for more complex configurations or custom rule development are sparse.
Fit analysis
Who is it for?
✓ Best for
TypeScript developers building secure and compliant AI applications
Teams needing to validate user inputs before processing by LLMs
✕ Not a fit for
Projects requiring real-time validation in high-latency environments
Applications where prompt validation is not a critical concern
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with llm-guard
Step-by-step setup guide with code examples and common gotchas.