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JsonMend

Official registry Developer tools

Repair broken JSON from LLM output and validate it against a JSON Schema.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http jsonmend 'https://jsonmend.mike-tusa.workers.dev/mcp' --header 'Authorization: <Optional. '\''Bearer <key>'\'' (free jm_ key) for higher limits. Works without a key.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "jsonmend": {
            "type": "http",
            "url": "https://jsonmend.mike-tusa.workers.dev/mcp",
            "headers": {
                "Authorization": "<Optional. 'Bearer <key>' (free jm_ key) for higher limits. Works without a key.>"
            }
        }
    }
}

Frequently asked questions

What is JsonMend?

Repair broken JSON from LLM output and validate it against a JSON Schema.

How do I install JsonMend?

It runs as a remote server. In Claude Code: claude mcp add --transport http jsonmend 'https://jsonmend.mike-tusa.workers.dev/mcp' --header 'Authorization: <Optional. '\''Bearer <key>'\'' (free jm_ key) for higher limits. Works without a key.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does JsonMend need an API key?

Yes. It expects Authorization, which you set in its configuration.

Who maintains JsonMend?

It is published by dev.workers.mike-tusa.jsonmend. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.