mcpbeat

JSON Validator API MCP Server

io.github.Br0ski777/json-validator
answering

JSON Validator API is answering right now. Last checked 15 min ago. It exposes 1 tools. Last commit 18 Jul 2026.

JSON syntax validation, JSON Schema checking, structure stats. x402 micropayment.

Uptime history 40 hours of history
40 hours agonow
100.0%
Uptime 24h
91 of 91 checks
1
Tools
read from the server
32 ms
Response time
average over 24h
0
Stars
last commit 18 Jul 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

run in your terminal
claude mcp add json-validator --transport http https://json-validator.api.klymax402.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "json-validator": {
      "url": "https://json-validator.api.klymax402.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.json-validator]
url = "https://json-validator.api.klymax402.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "json-validator": {
      "url": "https://json-validator.api.klymax402.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "json-validator": {
      "url": "https://json-validator.api.klymax402.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

data
data_validate_json
Use this when you need to validate JSON syntax or validate JSON data against a JSON Schema. Returns validity status, parse errors, formatted JSON, and structure stats (depth, key count, arrays, total size). Do NOT use for password checking — use security_check_password. Do NOT use for hash generation — use crypto_generate_hash. Do NOT use for cron expressions — use util_parse_cron.

Endpoints

URLTransportStateLatencyChecked
https://json-validator.api.klymax402.com/mcp sse answering 32 ms 15 min ago

JSON Validator API — questions

Answers built from our own checks of this server.

What can JSON Validator API do?
It exposes 1 tools, read directly from the server on our last check. Among them: data_validate_json. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is JSON Validator API working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 32 ms. The bar chart above shows every period we have measured.
How do I connect JSON Validator API?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does JSON Validator API need an API key?
No. JSON Validator API completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is JSON Validator API?
It answers our handshake in 32 ms on average, which is faster than 99% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is JSON Validator API open source?
Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.