What output does the `compare_json` tool return?
It returns an array of `JSONValueDifference` objects, each containing `pathSegments`, `pathString`, `pathBelongsTo`, and `diffType`. The same data is also echoed as JSON text in `content[0].text`.
C
Compare JSON MCP Server
@unitstack
基本信息
关于 Compare JSON MCP Server
A lightweight, dependency-free MCP for deep comparison of JSON values. Detects additions, deletions, type changes, and value changes between two JSON structures with fine-grained control over comparison behavior.
Compare JSON MCP Server 配置
使用下面的配置,将此服务器添加到你的 MCP 客户端。
{
"mcpServers": {
"compare-json": {
"command": "npx",
"args": [
"@compare-json/cli@latest",
"--mcp"
]
}
}
}Compare JSON MCP Server 工具
1Compare two JSON values and return differences. Supports various comparison options including comparisons case-insensitive comparisons, and numeric string handling.
概览
What is Compare JSON?
Compare JSON is an MCP server that exposes a JSON comparison engine as a tool for AI assistants, enabling them to compare two JSON values and retrieve detailed, structured differences.
How to use Compare JSON?
Start the server by running compare-json --mcp from a global install or npx @compare-json/cli --mcp. It communicates over stdio. Add the provided configuration to your MCP client (e.g., mcp.json) to register the compare-json server.
Key features of Compare JSON
compare_jsontool with multiple input options (raw, string, file path).- Configurable array comparison:
byIndex,lcs, orunordered. - Case‑insensitive key and value comparison toggles.
- Numeric‑string equals number comparison option.
- Returns an array of
JSONValueDifferenceobjects with path and diff type.
Use cases of Compare JSON
- AI assistants comparing two JSON configurations or API payloads.
- Detecting differences between expected and actual JSON responses.
- Validating JSON data changes across versions or environments.
常见问题
How can I provide the JSON values to compare?
For each side (base and contrast) you can provide the JSON as an already‑parsed value (`baseJSON`, `contrastJSON`), as a stringified value (`baseJSONString`, `contrastJSONString`), or as a file path (`baseJSONFilePath`, `contrastJSONFilePath`). At least one method per side is required; if multiple are given, file path takes precedence, then string, then raw value.
What array comparison strategies are available?
Three strategies: `byIndex` (default), `lcs` (longest common subsequence), and `unordered`. They are set via the `arrayCompareMethod` option.
Does Compare JSON support case‑insensitive comparison?
Yes. The `keyCaseInsensitive` and `valueCaseInsensitive` options (both default `false`) make key and value comparisons case‑insensitive.
How do I start and configure the MCP server?
Run `compare-json --mcp` or `npx @compare-json/cli --mcp`. In your MCP client config, add a server entry with command `npx` and args `["@compare-json/cli@latest", "--mcp"]`. The server communicates over stdio with no additional transport or auth setup required.
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