JsonMend
Repair broken JSON from LLM output and validate it against a JSON Schema.
使うべきか
品質と安全性
A
ツール定義とプロトコルへの準拠に関する自動分析に基づいています。
コンテキストコスト
~1,966トークン数（ツール定義）
~9.4 KB一般的なレスポンスサイズ
注意への影響は中程度（128k コンテキストの 1.54%）
これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。
インストール
ワンクリックインストール
これを `claude_desktop_config.json` ファイルに追加してください:
{
"mcpServers": {
"jsonmend": {
"url": "https://jsonmend.mike-tusa.workers.dev/mcp"
}
}
}リモートエンドポイント
https://jsonmend.mike-tusa.workers.dev/mcpstreamable-httpできること
ツール一覧
ツール（2）
🟢 読み取り専用🟡 書き込み🔴 削除⚪ 不明
🟢repair_json(input, format, schema, coerce, draft)
Turn 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/arrays/objects, and wraps NDJSON / several concatenated objects into one array. Returns the parsed value (json), the repaired text, and the list of fixes applied; valid input passes through unchanged with no fixes. Optional schema (+ coerce) also validates the result. Fails with isError (code unrepairable / no_json_found) when nothing JSON-like can be recovered. Pure computation: read-only, no network access, inputs not stored. Same engine and limits as POST /api/v1/repair.
入力スキーマ
{
"type": "object",
"properties": {
"input": {
"type": "string",
"minLength": 1,
"maxLength": 102400,
"description": "The raw (possibly broken) JSON text, e.g. an LLM reply with code fences and prose around the JSON. Max 102,400 bytes (UTF-8)."
},
"format": {
"type": "string",
"enum": [
"compact",
"pretty",
"preserve"
],
"default": "compact",
"description": "Layout of the returned text: compact (default), pretty (2-space indent), or preserve (jsonrepair's output, keeps original spacing and long-number digits)."
},
"schema": {
"type": "object",
"description": "A JSON Schema (draft 2020-12 by default; 2019-09, 7 and 4 also supported). Only local $refs (#/...) resolve; remote $refs are an error. Max 32 KB."
},
"coerce": {
"type": "boolean",
"default": false,
"description": "Convert values toward the schema's declared types before validating: \"42\" → 42, \"true\" → true, \"null\" → null, 5 → \"5\", x → [x]. Each change is listed in coercions."
},
"draft": {
"type": "string",
"enum": [
"2020-12",
"2019-09",
"7",
"4"
],
"description": "JSON Schema draft. Default: from the schema's $schema, else 2020-12."
}
},
"required": [
"input"
],
"additionalProperties": false
}出力スキーマ
{
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"changed": {
"type": "boolean",
"description": "false when the input was already valid JSON"
},
"inputWasValid": {
"type": "boolean"
},
"values": {
"type": "integer",
"description": "Number of top-level JSON values found (more than 1 = wrapped in an array)"
},
"fixes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string",
"enum": [
"removed_bom",
"stripped_code_fence",
"removed_surrounding_text",
"removed_leading_text",
"removed_trailing_text",
"extra_closing_brackets",
"wrapped_multiple_values",
"comments",
"single_quotes",
"smart_quotes",
"unquoted_keys",
"unquoted_strings",
"trailing_commas",
"extra_commas",
"missing_commas",
"missing_colons",
"python_literals",
"non_json_literals",
"invalid_numbers",
"control_characters",
"truncated",
"other_syntax_fixes"
]
},
"message": {
"type": "string"
},
"count": {
"type": "integer",
"minimum": 2
}
},
"required": [
"code",
"message"
]
}
},
"warnings": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
]
}
},
"json": {
"description": "The repaired JSON value (coerced if coerce was used)"
},
"format": {
"type": "string",
"enum": [
"compact",
"pretty",
"preserve"
]
},
"inputBytes": {
"type": "integer"
},
"outputBytes": {
"type": "integer"
},
"schema": {
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"errorCount": {
"type": "integer",
"description": "Total errors (at most 50 are listed); a lower bound when errorsTruncated is true"
},
"errorsTruncated": {
"type": "boolean",
"description": "true when the validator produced more than 5,000 raw errors and only the first 5,000 were examined"
},
"errors": {
"type": "array",
"items": {
"type": "object",
"properties": {
"path": {
"type": "string",
"description": "JSON Pointer to the failing value (\"\" = root)"
},
"keyword": {
"type": "string"
},
"schemaPath": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"path",
"keyword",
"message"
]
}
},
"draft": {
"type": "string",
"enum": [
"2020-12",
"2019-09",
"7",
"4"
]
},
"coerced": {
"type": "boolean"
},
"coercions": {
"type": "array",
"items": {
"type": "object",
"properties": {
"path": {
"type": "string"
},
"from": {
"type": "string"
},
"to": {
"type": "string"
}
},
"required": [
"path",
"from",
"to"
]
}
}
},
"required": [
"valid",
"errorCount",
"errors"
]
},
"plan": {
"type": "string",
"enum": [
"anonymous",
"key"
]
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"changed",
"inputWasValid",
"fixes",
"json"
]
}🟢validate_json(schema, input, data, coerce, draft)
Check 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 the schema's types before validating and lists each change. A schema mismatch is a normal result (valid: false), not an error. Drafts 2020-12 (default), 2019-09, 7, 4; only local $refs. Pure computation: read-only, no network access, inputs not stored. Same engine and limits as POST /api/v1/validate.
入力スキーマ
{
"type": "object",
"properties": {
"schema": {
"type": "object",
"description": "A JSON Schema (draft 2020-12 by default; 2019-09, 7 and 4 also supported). Only local $refs (#/...) resolve; remote $refs are an error. Max 32 KB."
},
"input": {
"type": "string",
"minLength": 1,
"maxLength": 102400,
"description": "JSON text to validate (repaired first if broken). Send this or \"data\", not both. Max 102,400 bytes."
},
"data": {
"description": "An already-parsed JSON value to validate. Send this or \"input\", not both."
},
"coerce": {
"type": "boolean",
"default": false,
"description": "Convert values toward the schema's declared types before validating: \"42\" → 42, \"true\" → true, \"null\" → null, 5 → \"5\", x → [x]. Each change is listed in coercions."
},
"draft": {
"type": "string",
"enum": [
"2020-12",
"2019-09",
"7",
"4"
],
"description": "JSON Schema draft. Default: from the schema's $schema, else 2020-12."
}
},
"required": [
"schema"
],
"additionalProperties": false
}出力スキーマ
{
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"valid": {
"type": "boolean"
},
"errorCount": {
"type": "integer",
"description": "Total errors (at most 50 are listed); a lower bound when errorsTruncated is true"
},
"errorsTruncated": {
"type": "boolean",
"description": "true when the validator produced more than 5,000 raw errors and only the first 5,000 were examined"
},
"errors": {
"type": "array",
"items": {
"type": "object",
"properties": {
"path": {
"type": "string",
"description": "JSON Pointer to the failing value (\"\" = root)"
},
"keyword": {
"type": "string"
},
"schemaPath": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"path",
"keyword",
"message"
]
}
},
"draft": {
"type": "string",
"enum": [
"2020-12",
"2019-09",
"7",
"4"
]
},
"coerced": {
"type": "boolean"
},
"coercions": {
"type": "array",
"items": {
"type": "object",
"properties": {
"path": {
"type": "string"
},
"from": {
"type": "string"
},
"to": {
"type": "string"
}
},
"required": [
"path",
"from",
"to"
]
}
},
"repaired": {
"type": "boolean",
"description": "true when \"input\" needed repair before validation"
},
"fixes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string",
"enum": [
"removed_bom",
"stripped_code_fence",
"removed_surrounding_text",
"removed_leading_text",
"removed_trailing_text",
"extra_closing_brackets",
"wrapped_multiple_values",
"comments",
"single_quotes",
"smart_quotes",
"unquoted_keys",
"unquoted_strings",
"trailing_commas",
"extra_commas",
"missing_commas",
"missing_colons",
"python_literals",
"non_json_literals",
"invalid_numbers",
"control_characters",
"truncated",
"other_syntax_fixes"
]
},
"message": {
"type": "string"
},
"count": {
"type": "integer",
"minimum": 2
}
},
"required": [
"code",
"message"
]
}
},
"warnings": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"code",
"message"
]
}
},
"json": {
"description": "The validated value (after repair and coercion)"
},
"plan": {
"type": "string",
"enum": [
"anonymous",
"key"
]
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"valid",
"errorCount",
"errorsTruncated",
"errors",
"json"
]
}コミュニティ
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