MCP servers that ship as code — a repository or a package you install and run locally (usually over stdio). They have no hosted endpoint, so we cannot probe or grade them: instead each one shows its repository, install command, license, stars and when it was last updated.
Collected from GitHub repositories and npm, PyPI, Cargo, Go, Maven, NuGet and RubyGems packages tagged as MCP servers, the official MCP Registry, Docker's MCP catalog, ModelScope, Baidu MCP World, Cline and other public directories; one entry per repository. A server that also offers a hosted endpoint is listed under Remote instead. These entries are not counted in our reachability, verification or readiness statistics.
-
json-mcp-filtergithub.com/kehvinbehvin/json-mcp-filterupdated this year
JSON MCP server to filter only relevant data for your LLM
MIT ★ 26 -
Repair broken or incomplete JSON, including output from language models. Local CLI and MCP server. No API key.
MIT -
toon-json-conversion-mcpgithub.com/arindam-b/toon-json-conversion-mcpupdated this year
TOON-JSON Conversion MCP Server
★ 1 -
Just Explore and Update Local Json
MIT -
Deterministic JSON repair and JSON Schema validation for AI agents and software. No LLM required.
NOASSERTION -
AI-powered json ai MCP server for agents. Supports validate json, transform json, diff json. By MEOK AI Labs.
pypi MIT License -
MCP server providing JSON schema generation and filtering tools using quicktype
npm MIT -
Vinkius Edge high-performance Model Context Protocol (MCP) server for robust JSON Schema validation.
★ 3 -
@prompt-to-json/mcpgithub.com/prompt-to-json/prompt-to-jsonupdated this year
MCP server for prompt-to-JSON contracts, JSON Schema validation, and structured LLM/agent outputs.
npm Apache-2.0 -
MCP server for Python JSON logs
MIT-0 ★ 4 -
—
MIT -
json-contractsgithub.com/json-contracts/json-contractsupdated this year
Local MCP server for natural-language-to-JSON workflows using Git-controlled JSON contracts and JSON Schema validation.
NOASSERTION ★ 1 -
json-contracts-studiogithub.com/json-contracts/json-contracts-studioupdated this year
Local web Studio for testing natural-language-to-JSON workflows with JSON Contracts.
NOASSERTION ★ 1 -
MCP Json navigator for allowing Ai using json files > 10MB
★ 1 -
json-mcpgithub.com/lpenguin/json-mcpupdated this year
MCP server for querying and manipulatingJSON data
MIT -
json-contractsgithub.com/json-contracts/json-contractsupdated this year
MCP server for natural-language-to-JSON workflows using Git-controlled JSON contracts and JSON Schema validation.
npm Apache-2.0 -
MCP Server for batch processing large JSON arrays in manageable batches with progress tracking
npm MIT -
json-mender-mcpactive
Deterministic JSON repair, regex testing, and real JSON-Schema validation for AI agents. Local, offline, no telemetry.
npm MIT -
Turn key: value notes, CSV/TSV and Markdown tables into clean, typed JSON. CLI and MCP server. Runs locally.
pypi MIT -
Turn key:value notes, CSV/TSV and Markdown tables into typed JSON. Local CLI and MCP server.
MIT -
MCP server for querying and modifying JSON, YAML, and TOML files using yq
pypi MIT -
mcp-json-toolsgithub.com/rog0x/mcp-json-toolsupdated this year
MCP server for JSON/data tools: validate against schema (Ajv), diff objects, transform/pick/flatten, CSV↔JSON, YAML↔JSON conversion. Install: npx @rog0x/mcp-json-tools
MIT -
json-to-csv-convertergithub.com/dancvv/json-to-csv-converterupdated this year
Zed MCP extension: JSON to CSV/Excel and CSV to JSON, with automatic delimiter/encoding/header detection, streaming, progress, row limits, and cancellation
MIT -
一个基于 MCP 协议的 JSON 转 Excel 服务，支持将结构化的 JSON 数据转换为带自定义表头的 Excel 文件。
-
Use Model Context Protocol with multiple Fireproof JSON document databases
npm MIT -
json_to_toon_compressor converts oversized JSON arrays into a compact toon-style textual representation that removes wasted JSON syntax while preserving structural meaning needed by agents.
-
yaml-json-converter-mcpgithub.com/vinkius-labs/yaml-json-converter-mcpupdated this year
Vinkius Edge high-performance Model Context Protocol (MCP) server for seamless YAML/JSON bidirectional transformation.
★ 3 -
@mseep/server-json-mcpstale
A JSON Model Context Protocol (MCP) server implementation for querying and manipulating JSON data. This server enables LLMs to interact with JSON data through a set of standardized tools.
npm -
Turn any JSON file into an MCP server in one command: list, search and get tools for Claude Desktop, Claude Code and Cursor. MIT.
MIT -
A structured data reader and writer like 'jq' and 'yq' for AI Agents
MIT ★ 10 -
json-to-toon-mcp-servergithub.com/your-username/json-to-toon-mcp-serverupdated this year
MCP server for converting JSON to TOON (Token-Oriented Object Notation) format - saves 30-60% on AI tokens
npm MIT -
json-query-mcpgithub.com/ipolyzos/json-query-mcpupdated this year
stdio MCP server wrapping jq in a safe, structured, read-only way
Apache-2.0 -
Chamber MCP: seal and open JSON with two keys. A license to seal new secrets is $20 a month or $200 a year. Opening takes both keys and costs nothing extra.
NOASSERTION -
etim-jsongithub.com/m-heath-consulting/etim-jsonupdated this year
The ETIM classification model as clean JSON — convert, validate, generate TypeScript types, search, and serve to AI agents over MCP. Ships no ETIM data; converts the model you are licensed to download.
npm MIT -
The ETIM classification model as clean JSON — convert, validate, generate TypeScript types, search, and serve to AI agents over MCP. Ships no ETIM data.
NOASSERTION -
json-mcp-liteno update data
Turn any JSON file (product catalogue, FAQ, price list) into a read-only MCP server. Exposes list, search and get tools over stdio. Keyword search, no embeddings, no API key, two dependencies. Works with Claude Desktop, Claude Code and Cursor. MIT.
smithery -
seattle-open-jsongithub.com/mikhael28/seattle-open-jsonupdated this year
A MCP server, NPM package & front-end React playground to ingest data from the City of Seattle. Playground at http://seattleopenjson.com.s3-website.us-east-2.amazonaws.com
MIT ★ 1 -
Fast Python SDK, REST API & Claude MCP Servers for SEC EDGAR (Form 4 Insider Trading, 13F Hedge Fund Whales, N-PORT ETFs, 10-K/10-Q XBRL, 8-K, 13D, Form D), FDA Biotech Catalysts & US B2B Lead Generation.
★ 1 -
Repair broken JSON from LLM output and validate it against a JSON Schema. API + MCP server.
MIT -
PText: paste text, get a useful result. Open-source deterministic text tools (remove duplicate lines, CSV to JSON, extract emails, JSON formatter and validator, clean text) as a zero-dependency library, CLI and MCP server for AI assistants.
npm MIT -
A loupe for large JSON — lossless, local-first viewer, differ, query tool, and MCP server for AI agents
npm MIT ★ 2 -
JSON form definition for React, Vue, Swift, Kotlin, Figma and AI agents: validation, conditional fields, multi-step and branching in one file. Zero-dependency core, MCP server, JSON Schema.
npm MIT ★ 8 -
MCP server with deterministic text tools for Claude, Cursor, Codex and other AI assistants: remove duplicate lines, CSV to JSON, extract emails, JSON format, clean text. stdio and Streamable HTTP (Cloudflare Workers, Deno, Bun).
npm MIT -
Inspect, redact and compare webhook JSON locally. A CLI and Claude MCP server for debugging API integrations without exposing raw values in tool results.
MIT -
MCP server + whiteboard UI for AI-assisted diagramming (Claude Code / Codex). Documents are stored as OKF Markdown or JSON Canvas 1.0.
npm Apache-2.0 -
Recovers intent from imperfect AI output — JSON, tool calls, names, paths and Markdown edits — with auditable receipts. Rust crate, MCP server and CLI.
Apache-2.0 -
Local PowerPoint CLI and MCP server for editable PPTX, native 3D charts, JSON patches, template data binding, PDF/PNG export and Markdown extraction for RAG.
npm PolyForm-Noncommercial-1.0.0 -
@mukundakatta/validate-mcpgithub.com/mukundakatta/validate-mcpupdated this year
MCP server: validate JSON against a JSON Schema (draft-07) with detailed error paths.
npm MIT -
Composable RDF operations in JSON
pypi Apache-2.0 -
AISchemaGate validates and repairs structured LLM output against a contract, plus DataContractGate data contracts. Repair uses the violation fields from that check (min, max, pattern, enum, compliance_mode). The contract checks values a JSON Schema or Pyd
npm MIT -
JsonMcpToolgithub.com/JokerQyou/JsonMcpToolupdated this year
An MCP server for LLM to edit I18Next JSON files
-
Audit your package.json dependencies
npm MIT -
Precis - 可配置数据校验工具 CLI（校验 CSV/Excel/JSON 数据质量）
pypi Apache-2.0 -
🕷️ Turn PostgreSQL functions into a secure API: JSON-RPC, real-time SSE from LISTEN/NOTIFY, file & ZIP downloads, OpenAPI and MCP for AI agents. Every request runs as a real database role (GRANTs, RLS), with Basic or JWT auth. Single Go binary, zero boilerplate, Prometheus metrics.
MIT ★ 7 -
transformgithub.com/hegner123/transformupdated this year
Composable JSON array pipeline MCP tool — group, sort, filter, count, flatten, format
MIT -
MCP server for persistent memory with JSON storage and atomic fact operations
npm MIT -
memory-mcpgithub.com/dog-m/memory-mcpupdated this year
A lightweight, portable MCP server in Go for managing long-term AI memories with JSON storage.
MIT -
feed-forgegithub.com/therealMrFunGuy/feed-forgeupdated this year
Turn any website into an RSS/JSON feed via API + MCP server
MIT -
Pure Python FastMCP Server for Token-Optimized Object Notation (TOON) JSON payload compression
MIT -
@asafelobotomy/ceeline-mcp-servergithub.com/asafelobotomy/ceelineupdated this year
MCP JSON-RPC server for Ceeline compact transport tools
npm MIT