LLM Orchestration

LLM Json

TypeScript SDK for extracting and correcting JSON from LLM outputs

Status
Generally available
Last checked
Checked · Oct 13, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

A TypeScript SDK that helps developers extract and correct JSON data from the output of large language models, ensuring accurate and usable data extraction.

The only TypeScript SDK specifically designed for extracting and correcting JSON from large language model outputs, ensuring precise and reliable data handling.

When it fits — and when it doesn’t

A good fit 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

Look elsewhere if

  • 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

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Steep learning curve for non-TypeScript developers

    The SDK is built with TypeScript, which may require familiarity with strong typing and advanced JavaScript concepts.

  2. 02

    Limited language support beyond English

    The tool's effectiveness in extracting JSON from LLM outputs might be reduced when dealing with non-English text or specific regional formats.

  3. 03

    Frequent breaking changes between versions

    Previous updates, such as the v0.1 to v0.2 migration, required significant code rewrites and adjustments in chain definitions.

  4. 04

    Small community and slower issue resolution

    The open-source nature of the project means that issues might take longer to resolve due to limited contributors and maintainers.

What it does well

  • Extracts and corrects JSON from LLM outputs

  • Ensures accurate data extraction for further processing

  • Built with TypeScript, offering strong typing support

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up LLM Json

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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