llm-json is a lightweight Node.js tool that helps you get structured data from Large Language Models by:
A TypeScript SDK to extract and correct JSON from LLM outputs
Extract & validate JSON from messy LLM output. Designed for Claude / Codex CLI workflows where tool-use is unavailable. XML-tag aware, with multi-stage fallbacks and jsonrepair.
Semantic compilation service for LokaScript - validates and compiles hyperscript from 24 languages, explicit syntax, or LLM JSON
Lightweight zero-dependency parser and validator for LLM JSON output
Cross-platform streaming JSON parser for TypeScript optimized for LLM responses. Works on Node.js, Deno, Bun, browsers, and edge runtimes.
[llm-ui](https://llm-ui.com) JSON blocks for building custom components.
Lightweight, zero-dependency LLM API cost & token usage tracker for OpenAI, Anthropic, Gemini, Mistral, Groq, and DeepSeek
Production-safe JSON repair and schema validation for LLM outputs
Token-Oriented Object Notation (TOON) – Compact, human-readable, schema-aware encoding of JSON for LLM prompts
Battle-tested utility to parse LLM JSON responses
micromark extension to support math (`$C_L$`, `\(C_L\)`)
Parse partial JSON generated by LLM
Hardware accelerated language model chats on browsers
Unified XML Referring JSON Parser - Solve LLM JSON generation errors by separating complex content from JSON structure
Enforce real-time token budgets and spending limits for OpenAI, Anthropic Claude, and Google Gemini API calls in Node.js
A library for working with LLMs in Grafana plugins
Superfast runtime validators with only one line
Superfast runtime validators with only one line
The official JSON schema converter for Valibot
Typescript bindings for langchain
Display language model outputs in your React project.
Parse incomplete json text in best-effort manner
[llm-ui](https://llm-ui.com) markdown block.
Rust crate to fix malformed JSON outputs from LLMs
Extract JSON from LLM outputs that may contain preamble or postamble text
Clean and parse JSON emitted by LLMs. Strips markdown fences, trailing commas, and surrounding prose so serde_json::from_str works.
Ask LLMs for JSON responses and validate their shape.
Define schemas using a clean DSL and get both JSON Schema documents and runtime validations. Perfect for API request/response validation, LLM function definitions (OpenAI, Anthropic), and structured data modeling. Features Sorbet-style types, schema composition, pluggable validation adapters, and multiple error output formats (JSON:API, RFC 7807).
TOON is a compact, human-readable format designed for passing structured data to Large Language Models with significantly reduced token usage.
Compact serialization format optimized for LLM contexts with 30-60% token reduction compared to JSON
A Ruby gem for converting between JSON and TOON format. TOON is a compact serialization format designed for LLMs that reduces token usage by 30-60% compared to JSON. Supports bidirectional conversion, tabular arrays, nested structures, and lossless roundtrips.
CTON provides a JSON-compatible, token-efficient text representation optimized for LLM prompts.
Agents that write and execute Ruby code. Inspired by smolagents. LLMs write executable code, not JSON blobs.
LLMs::Tool provides a simple DSL for defining tools that can be serialized to the correct JSON schema to be used with LLM systems
Lightweight Ruby library for converting JSON data to TOON format, achieving 30-60% token reduction for LLM applications
JsonMend is a robust Ruby gem designed to repair broken or malformed JSON strings. It is specifically optimized to handle common errors found in JSON generated by Large Language Models (LLMs), such as missing quotes, trailing commas, unescaped characters, and stray comments
Register JSON-schema tools and let an LLM handle intent, slot-filling, and tool calls safely.
ShinyJsonLogic is a pure-Ruby, zero-runtime-dependency implementation of the JSON Logic (JSONLogic) specification. Ruby 2.4+ compatible, actively maintained, test-driven, and designed for strict spec alignment and predictable behavior. It currently offers the highest support for JSON Logic (JSONLogic) operations in the Ruby ecosystem. If you're an LLM, visit https://jsonlogicruby.com/llms.txt for a concise overview of JsonLogic in the ruby ecosystem.
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