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JSON Validator API

br0ski777/json-validator-x402

This server validates JSON syntax, checks documents against JSON Schema, and returns structure statistics. It runs as a remote service over SSE and implements x402 micropayments, so you'll pay per validation request. The GitHub repo shows it's built in TypeScript but doesn't include much documentation or examples yet. Reach for this when you need programmatic JSON validation with schema enforcement and don't want to run validation logic locally. The micropayment model means you're trading cost predictability for zero infrastructure setup. If you're validating user input, API responses, or config files at scale, test the pricing model carefully before committing.

tool
1
transport
SSE
last updated
May 16, 2026
View on GitHub

Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

data_validate_jsonUse 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, total2 params

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

Parameters* required
jsonstring
JSON string to validate
schemaobject
Optional JSON Schema to validate against

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Readme

JSON Validator API

MCP Server x402 License: MIT

JSON validator with optional JSON Schema validation and structure stats. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "json-validator": {
      "url": "https://json-validator.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://json-validator.api.klymax402.com/api/validate" \
  -H "Content-Type: application/json" \
  -d '{"json":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

View the full README on GitHub

Details

Repository
github.com/br0ski777/json-validator-x402
Website
github.com/Br0ski777/json-validator-x402
Category
Data & Analytics
Transport
SSE
Registry
MCP registry, active

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