LLM Json
TypeScript SDK for extracting and correcting JSON from LLM outputs
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is LLM Json?
A TypeScript SDK that helps developers extract and correct JSON data from the output of large language models, ensuring accurate and usable data extraction.
Key differentiator
“The only TypeScript SDK specifically designed for extracting and correcting JSON from large language model outputs, ensuring precise and reliable data handling.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
The SDK is built with TypeScript, which may require familiarity with strong typing and advanced JavaScript concepts.
The tool's effectiveness in extracting JSON from LLM outputs might be reduced when dealing with non-English text or specific regional formats.
Previous updates, such as the v0.1 to v0.2 migration, required significant code rewrites and adjustments in chain definitions.
The open-source nature of the project means that issues might take longer to resolve due to limited contributors and maintainers.
Fit analysis
Who is it for?
✓ Best for
TypeScript developers needing to extract and correct JSON from AI-generated text
Projects where the accuracy of extracted data is critical, such as in financial or medical applications
Teams working on integrating LLM outputs into TypeScript-based systems
✕ Not a fit for
Developers who are not using TypeScript or do not require JSON correction capabilities
Scenarios where real-time streaming and processing of raw text output from LLMs is more critical than structured data extraction
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
Alternatives
Works well with
Next step
Get Started with LLM Json
Step-by-step setup guide with code examples and common gotchas.