Repair broken JSON from LLM output and validate it against a JSON Schema.
Connect Remote server
claude mcp add --transport http jsonmend https://jsonmend.mike-tusa.workers.dev/mcp --header "Authorization: Bearer <YOUR_API_KEY>"
{
"mcpServers": {
"jsonmend": {
"url": "https://jsonmend.mike-tusa.workers.dev/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
{
"servers": {
"jsonmend": {
"type": "http",
"url": "https://jsonmend.mike-tusa.workers.dev/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://jsonmend.mike-tusa.workers.dev/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 2 found in our last check
repair_jsonTurn broken or messy JSON text into valid JSON. Strips Markdown code fences and prose before/after the JSON, removes comments and trailing commas, converts single/curly quotes, quotes unquoted keys, maps Python None/True/False, inserts missing commas, closes truncated strings/ar…
validate_jsonCheck JSON against a JSON Schema and get every error with its JSON Pointer path. Send the JSON either as text ("input"; broken text is repaired first, and the fixes are listed) or as an already-parsed value ("data"). Optional coerce converts "42" → 42, "true" → true, etc. toward…
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | Optional. 'Bearer <key>' (free jm_ key) for higher limits. Works without a key. |
Details
| Endpoint | https://jsonmend.mike-tusa.workers.dev/mcp (Streamable HTTP) |
| First published | 15 Oct 2026 |
| Last updated | 15 Oct 2026 |
| Registry name | dev.workers.mike-tusa.jsonmend/jsonmend |
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