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io.github.shoggi211/jsonaut

by shoggi211 · remote · no sign-in to list tools · v0.1.0 · published by GitHub user shoggi211

Repair malformed JSON from LLM/agent output; optional JSON Schema coercion. Free + x402 paid.

Changes · 3
CompareRegistry entry

4 tools: 3 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http jsonaut https://jsonaut.jsonaut-shaurya.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Changes things 3Claude Code: ask
  • extract_jsonExtract JSON embedded in arbitrary text — LLM prose, chat messages, logs, emails — then repair and validate it.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Extract JSON embedded in arbitrary text — LLM prose, chat messages, logs, emails — then repair and validate it. Deterministic extraction is free. If no JSON can be located and allow_llm_fallback is true, a paid LLM extracts structured data from the text (requires x402 payment; charged only on success). Pass a JSON Schema to shape the output.
  • infer_schemaInfer a JSON Schema (draft 2020-12) from an example JSON value.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Infer a JSON Schema (draft 2020-12) from an example JSON value. Free and deterministic. Set as_samples=true when the input is an array of example objects of the same shape to merge them into one schema. Turns sample agent/tool output into a reusable schema.
  • repair_jsonRepair malformed JSON (trailing commas, single quotes, truncation, markdown fences, comments, python literals) and optionally validate/coerce it against a JSON Schema.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Repair malformed JSON (trailing commas, single quotes, truncation, markdown fences, comments, python literals) and optionally validate/coerce it against a JSON Schema. Deterministic repair is free. If it fails and allow_llm_fallback is true, a paid LLM repair is attempted (requires x402 payment; charged only on success).
Only reads 1Claude Code: allow
  • validate_jsonValidate a JSON string against a JSON Schema.No findings

    Why it is in this group

    • The name "validate_json" says "validate": a word for reading.
    Description, as the server wrote it
    Validate a JSON string against a JSON Schema. Free. Returns validity and a list of violations.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http jsonaut https://jsonaut.jsonaut-shaurya.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__jsonaut__validate_json"
    ],
    "ask": [
      "mcp__jsonaut__repair_json",
      "mcp__jsonaut__extract_json",
      "mcp__jsonaut__infer_schema"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as jsonaut. Review it before you use it.