Free Tier: 20 requests/day per IP

JSON Toolkit MCP Server

6 powerful JSON utilities for AI agents — format, validate, diff, query, transform, and generate schemas from JSON data.

Quick Connect

Add to your Claude Code / Cursor / Windsurf / Cline MCP config:

{
  "mcpServers": {
    "json-toolkit": {
      "url": "https://json-toolkit-mcp.yagami8095.workers.dev/mcp",
      "type": "http"
    }
  }
}

MCP Protocol: 2025-03-26 | Streamable HTTP | JSON-RPC 2.0 | Batch support

6 Free Tools

json_format — Pretty-print or minify JSON with configurable indentation (1-8 spaces)
json_validate — Validate JSON with detailed error info including line, column, and fix suggestions
json_diff — Compare two JSON objects — shows added, removed, and changed paths
json_query — Query JSON with JSONPath syntax: dot notation, wildcards, filters, slices, deep scan
json_transform — Transform JSON: flatten/unflatten, pick/omit keys, rename keys (with deep option)
json_schema_generate — Generate JSON Schema from sample data — infers types, formats, required fields

Example Tool Calls

json_query — JSONPath filter

{
  "method": "tools/call",
  "params": {
    "name": "json_query",
    "arguments": {
      "json": "{"users": [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 17}]}",
      "query": "$.users[?(@.age>=18)].name"
    }
  }
}

json_transform — flatten nested object

{
  "method": "tools/call",
  "params": {
    "name": "json_transform",
    "arguments": {
      "json": "{"a": {"b": {"c": 1}}, "d": 2}",
      "operation": "flatten",
      "options": { "delimiter": "." }
    }
  }
}

Rate Limits

tool calls / day

per IP address, resets midnight UTC

tools available

all free, no API key required

OpenClaw MCP Ecosystem

openclaw-intel-mcp — AI market intelligence — track Claude Code, Cursor, Devin growth trends
openclaw-fortune-mcp — Daily zodiac horoscope & tarot readings for all 12 signs
moltbook-publisher-mcp — Japanese content publishing — MD→HTML, SEO, EN→JP for note.com/Zenn/Qiita
agentforge-compare-mcp — AI coding tool comparison — Claude Code vs Cursor vs Devin analysis
regex-engine-mcp — Regex testing, debugging, explanation & generation with examples
color-palette-mcp — Color palette generation, conversion, contrast checks & harmony
prompt-enhancer-mcp — Prompt optimization, rewriting, scoring & multilingual enhancement
timestamp-converter-mcp — Unix/ISO timestamp conversion, timezone math & duration calc
product-store — AI tools, templates, and intelligence products

OpenClaw Store — AI tools, prompts, and intelligence products

Health Check /health | MCP Endpoint /mcp