Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@JsonMend fix this broken JSON: {'name': 'Ana', 'age': 30,}"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
Repair broken JSON from LLM output and validate it against a JSON Schema.
Web app and API: https://jsonmend.mike-tusa.workers.dev/
Pricing and plans: https://jsonmend.mike-tusa.workers.dev/
Support: digitalpromohub.support@gmail.com
Related MCP server: json-sanity
JsonMend is a remote MCP server (Streamable HTTP) at https://jsonmend.mike-tusa.workers.dev/mcp. Tools: repair_json, validate_json.
Most MCP clients (Claude Desktop, Cursor, Cline, Windsurf) accept this config:
{
"mcpServers": {
"jsonmend": {
"type": "http",
"url": "https://jsonmend.mike-tusa.workers.dev/mcp"
}
}
}Clients that only support stdio can bridge with npx mcp-remote https://jsonmend.mike-tusa.workers.dev/mcp. VS Code uses a servers key instead of mcpServers.
The server.json file is the MCP Registry manifest for this server.
Requires Node.js 20+ and a Cloudflare account.
npm install
npx wrangler dev # local dev serverwrangler.toml is a template: create your own KV namespaces / D1 databases / rate-limit namespaces and replace the <PLACEHOLDER> values before npx wrangler deploy. Any secrets the Worker reads go in wrangler secret put (or .dev.vars locally), never in the repo.
MIT (c) Digital Promo Hub. See LICENSE.
This server cannot be deployed
Deterministic JSON repair, validate, example-gen, schema-coerce for agents. Zero LLM, sub-10ms.
Repair broken LLM JSON and check it against a JSON Schema. Flags cut-off output. Free trial.
Repair malformed JSON from LLM/agent output; optional JSON Schema coercion. Free + x402 paid.
Repair broken JSON from LLM output and validate it against a JSON Schema.