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FixMyJSON MCP Server

answering

FixMyJSON is answering right now. Last checked 5 min ago. It exposes 1 tools.

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

Uptime history 10 days of history · worst day 98%
10 days agonow
98.9%
Uptime 24h
90 of 91 checks
1
Tools
read from the server
1159 ms
Response time
average over 24h
open, no key
Access
streamable-http

FixMyJSON does not always answer

Over the last week it answered 99.2% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

run in your terminal
claude mcp add fixmyjson --transport http https://fixmyjson-api.onrender.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://fixmyjson-api.onrender.com/mcp
~/.codex/config.toml
[mcp_servers.fixmyjson]
url = "https://fixmyjson-api.onrender.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "fixmyjson": {
      "url": "https://fixmyjson-api.onrender.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "fixmyjson": {
      "type": "http",
      "url": "https://fixmyjson-api.onrender.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

repair
repair_json
Repair malformed JSON produced by an LLM or agent (trailing commas, missing quotes, code fences, chatty text around the JSON, <think> blocks, double-encoded JSON) and check the result against a JSON Schema. Returns the repaired value, what was changed, what could not be fixed (unresolved_errors), and `truncated: true` when the input looks cut off (e.g. by a token limit) so you can retry instead of trusting it. It never invents missing data. Free trial, no signup: 20 calls per client per day, 20000 characters per call.

Endpoints

URLTransportStateLatencyChecked
https://fixmyjson-api.onrender.com/mcp streamable-http answering 576 ms 5 min ago

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answering

FixMyJSON — questions

Answers built from our own checks of this server.

What can FixMyJSON do?
It exposes 1 tools, read directly from the server on our last check. Among them: repair_json. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is FixMyJSON working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 90 of 91 checks got a reply (98.9%), average response time 1159 ms. The bar chart above shows every period we have measured.
How do I connect FixMyJSON?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does FixMyJSON need an API key?
No. FixMyJSON completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is FixMyJSON?
It answers our handshake in 1159 ms on average, which is faster than 3% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.