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FixMyJSON

Official registry Developer tools

Repair broken LLM JSON and check it against a JSON Schema. Flags cut-off output. Free trial.

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 fixmyjson 'https://fixmyjson-api.onrender.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "fixmyjson": {
            "type": "http",
            "url": "https://fixmyjson-api.onrender.com/mcp"
        }
    }
}

Frequently asked questions

What is FixMyJSON?

Repair broken LLM JSON and check it against a JSON Schema. Flags cut-off output. Free trial.

How do I install FixMyJSON?

It runs as a remote server. In Claude Code: claude mcp add --transport http fixmyjson 'https://fixmyjson-api.onrender.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does FixMyJSON need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Who maintains FixMyJSON?

It is published by tonbifun. 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.