Mend

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Repair broken JSON without changing values, find the exact error, outline or query big payloads.

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mend_check_json Read-only

Use when you need to know whether text is strictly valid JSON, and if not, exactly where it breaks. Strict RFC 8259 check (the same accept/reject as JSON.parse). Returns line, column, the offending line with a caret and whether Mend can repair it. Use mend_repair_json to fix it. Up to 100,000 characters.

textstring, required

The text to validate.

Tools (4)

mend_check_json

read-only

Argument	Type	Description
text*	string	The text to validate.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "maxLength": 100000,
      "minLength": 1,
      "description": "The text to validate."
    }
  }
}

mend_outline_json

Use before reading a big JSON response, log or export into context: returns a compact outline of the structure (keys, types, array lengths, one example per repeated shape) so you can plan a query without spending tokens on the whole document. Repairs the JSON first if needed. Follow with mend_query_json to pull only the values you need. Up to 100,000 characters.

read-only

Argument	Type	Description
text*	string	The JSON (or JSON-ish text).
max_depth	integer	How many levels to expand. Default 4.
max_items	integer	How many array items to show when items differ. Default 6.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "maxLength": 100000,
      "minLength": 1,
      "description": "The JSON (or JSON-ish text)."
    },
    "max_depth": {
      "type": "integer",
      "maximum": 10,
      "minimum": 1,
      "description": "How many levels to expand. Default 4."
    },
    "max_items": {
      "type": "integer",
      "maximum": 20,
      "minimum": 1,
      "description": "How many array items to show when items differ. Default 6."
    }
  }
}

mend_query_json

Use when you need specific fields from a JSON document without reading all of it: $.users[0].name, $.items[*].id, $.a.b[-1], $.list[1:3], $..email (recursive). Returns each match with its exact path, type and value. Repairs the JSON first if needed, so broken input still works. Up to 100,000 characters.

read-only

Argument	Type	Description
max	integer	Maximum matches to return. Default 50.
path*	string	Path such as $.users[*].email, data.items[0], $..id, $.list[-1], $.list[1:3].
text*	string	The JSON (or JSON-ish text).

Input schema (JSON)

{
  "type": "object",
  "required": [
    "text",
    "path"
  ],
  "properties": {
    "max": {
      "type": "integer",
      "maximum": 200,
      "minimum": 1,
      "description": "Maximum matches to return. Default 50."
    },
    "path": {
      "type": "string",
      "maxLength": 300,
      "minLength": 1,
      "description": "Path such as $.users[*].email, data.items[0], $..id, $.list[-1], $.list[1:3]."
    },
    "text": {
      "type": "string",
      "maxLength": 100000,
      "minLength": 1,
      "description": "The JSON (or JSON-ish text)."
    }
  }
}

mend_repair_json

Use when JSON from an LLM, API, log, config or copy-paste fails to parse (JSON.parse error, "Unexpected token", "Expecting property name"), or the user pastes JSON with trailing commas, single quotes, unquoted keys, comments, Python True/False/None, NaN, missing commas or brackets, a ```json fence, text around it, or output that was cut off. Deterministic repair: returns valid, formatted JSON plus a list of every fix with line and column. Values are never rewritten, so big numbers, number formatting and key order stay exactly as written (re-asking a model to "fix the JSON" changes data and costs tokens). If the text is already valid it says so. Up to 100,000 characters.

read-only

Argument	Type	Description
text*	string	The broken JSON, or any text that contains JSON (a chat reply, a log line, a code block).
indent	integer	Spaces per indent level in the output. Default 2. Use 0 for one minified line.
sort_keys	boolean	Sort object keys alphabetically. Default false (keep the original order).

Input schema (JSON)

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "maxLength": 100000,
      "minLength": 1,
      "description": "The broken JSON, or any text that contains JSON (a chat reply, a log line, a code block)."
    },
    "indent": {
      "type": "integer",
      "maximum": 8,
      "minimum": 0,
      "description": "Spaces per indent level in the output. Default 2. Use 0 for one minified line."
    },
    "sort_keys": {
      "type": "boolean",
      "description": "Sort object keys alphabetically. Default false (keep the original order)."
    }
  }
}

Mend

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mend_check_json Read-only

Mend

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mend_check_json Read-only

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Tools (4)

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