JSON syntax validation, JSON Schema checking, structure stats. x402 micropayment.
JSON Validator API MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. JSON syntax validation, JSON Schema checking, structure stats. x402 micropayment.
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.
Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client. The configuration blocks on this page cover the common clients.
Once JSON Validator API is connected, these are the calls the assistant has available:
data_validate_json — POSTPlenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. JSON Validator API's toolset — data_validate_json — is a fair guide to whether it matches your workflow. It is maintained by Br0ski777; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| data_validate_json | POST |
{
"mcpServers": {
"json-validator": {
"url": "https://json-validator.api.klymax402.com/mcp"
}
}
}Configuration as documented by the project. Restart the client after saving.
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