Best Json AI Skills & MCP Servers

Production-ready library for converting OpenAPI specifications into MCP tool definitions

Loki Mode by Autonomi. Autonomous spec-to-product system: takes a PRD, GitHub issue, OpenAPI/JSON/YAML, or one-line brief to a deployed app via the RARV-C closure loop with 11 quality gates. Provider-agnostic (Claude Code, OpenAI Codex, Cline, Aider).

29 developer utilities as an MCP server — JSON repair, SQL format, hash, encode/decode, UUID, regex, CSV, subnet calc, diagram generation, git diff parsing, DB schema parsing, JSON schema validation, and more. No API keys. Runs locally.

MCP server: generate professional PDFs from JSON in Claude, Cursor, Windsurf, or any AI agent. Serverless, no Chromium. Invoices, reports, resumes.

MCP server for AI-powered i18n file translation. Translates JSON, CSV, Android XML, iOS .strings, PO, and XLIFF into 29 languages.

Open-source MCP server to publish to Dev.to, Ghost, Hashnode, WordPress, Medium, Substack, LinkedIn, X, Bluesky, and Mastodon from Claude Code. Local stdio, no cloud relay. Includes SEO scoring, JSON-LD schema, canonical-URL wiring, social-post generation

Local-first MCP server for Claude Code cost analysis, budgets, forecasts, anomalies, and subagent-aware optimization from local JSONL session logs.

Format data into various output formats — pretty JSON, YAML, markdown, ASCII tables.

MCP server for validating, transforming, and normalizing structured data - built specifically for AI agents

Headless spreadsheet formula engine for Node.js services and agents with WorkPaper JSON persistence and formula readback.

MCP server for BrewPage — publish and manage HTML, KV, JSON, and file content from AI assistants

MCP server for natural-language-to-JSON workflows using Git-controlled JSON contracts and JSON Schema validation.

A comprehensive MCP server providing 44 tools for filesystem operations, process management, interactive sessions, async file search, JSON repair, encoding fix, duplicate detection, OCR, ZIP archives, Markdown export, and cloud-lock-safe file operations

A developer-focused MCP server providing 17 tools for code analysis, JSON repair, encoding fix, import organization, format conversion, diff, and regex testing

Local web Studio for testing natural-language-to-JSON workflows with JSON Contracts.

MCP server for searching past Claude Code conversation history. Local BM25 search over JSONL logs with persistent index, secret redaction, solved-hint, and instant claude --resume.

Convert Playwright scripts into Tap v2 plans. Compile .spec.ts / .test.ts files into deterministic v2 Plan JSON that runs at zero LLM tokens in Claude Code, Cursor, and any MCP host.

MCP server with 45 developer utilities (16 free + 29 pro). Free: UUID, hash, HMAC, base64, timestamps, JWT decode, random strings, URL encode/decode, JSON format, YAML/JSON convert, regex test, cron explain, color convert, HTTP status, slugify, HTML escap

Scaffold a Tap v2 browser-automation plan in seconds. `npx create-tap-script <site>/<name>` generates a deterministic .plan.json that runs at zero LLM tokens in Claude Code, Cursor, and any MCP host.

MCP web extraction for permitted public pages: no-key demo plus live URL-to-JSON extraction with honest blocked-page errors

jwt-lab – A fast, secure, beautiful JWT CLI tool and MCP server for developers & AI agents. Encode, decode, verify, inspect, audit, and generate keys for JSON Web Tokens.

Extract design tokens (colors, typography, spacing, border radius, shadows) from any public website. Generates JSON and CSS custom properties for local projects. Available as an AI agent skill (Claude, Cursor, Codex) and standalone CLI.

Standalone MCP (Model Context Protocol) server - stdio/http/websocket transports, connection pooling, tool registry

Zero-auth MCP server with everyday developer utilities: base64, UUID, hash, JWT decode, cron, timestamps, JSON, regex