JsonMend
Repair broken JSON from LLM output and validate it against a JSON Schema.
我该使用它吗
质量与安全性
A
基于对工具定义和协议合规性的自动分析。
上下文开销
~1,966token 数（工具定义）
~9.4 KB典型响应大小
对注意力有中等影响（占 128k 上下文窗口的 1.54%）
这是每次将服务器的工具加载到模型上下文窗口时所消耗的大致 token 数。数值越高，可用于其他任务的注意力就越少。
安装
一键安装
将以下内容添加到你的 `claude_desktop_config.json` 文件中：
{
"mcpServers": {
"jsonmend": {
"url": "https://jsonmend.mike-tusa.workers.dev/mcp"
}
}
}远程端点
https://jsonmend.mike-tusa.workers.dev/mcpstreamable-http它能做什么
工具清单
工具（2）
🟢 只读🟡 写入🔴 删除⚪ 未知
🟢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.
输入模式
{
"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
}输出模式
{
"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.
输入模式
{
"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
}输出模式
{
"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"
]
}社区
证据
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