MCP HAR Server

A Model Context Protocol (MCP) server that parses HAR (HTTP Archive) files and displays requests in a simplified format. This tool is designed to be used with AI assistants through the MCP protocol.

- Parse HAR files and extract request/response information
- Display requests with hash identifiers for easy reference
- Toggle query parameter visibility
- Filter requests by status code, method, URL pattern, or exclude specific domains
- View detailed headers and body information for specific requests
- List unique domains from HAR files to help with filtering

Displays HAR file requests in a simplified format with hash identifiers. Includes filtering options to narrow down results.

Provides detailed information about specific HAR file entries including headers and request/response bodies. Uses hash identifiers to reference specific requests.

Lists all unique domains found in a HAR file to help reduce output volume and provide filtering options.

To use this server with Claude Desktop, add the following configuration to yourclaude_desktop_config.json:

The configuration fileclaude_desktop_config.jsonis located at: After changing the configuration, please restart Claude Desktop.

- macOS:~/Library/Application Support/Claude/claude_desktop_config.json
- Windows:%APPDATA%\Claude\claude_desktop_config.json

{ "mcpServers": { "mcp-har-server": { "command": "npx", "args": ["-y", "@naotaka/mcp-har-server@latest"] } } }

{ "mcpServers": { "mcp-har-server": { "command": "node", "args": ["/path/to/mcp-har-server/build/index.js"] } } }

The HAR viewer tool can be accessed through the MCP protocol. Here's an example of how to use it:

// Example usage through MCP protocol const result = await mcpClient.callTool('har_viewer', { filePath: '/path/to/your/file.har', showQueryParams: true, // Set to false to hide query parameters filter: { statusCode: 200, // Optional: Filter by status code method: 'GET', // Optional: Filter by HTTP method urlPattern: 'api', // Optional: Filter by URL pattern excludeDomains: ['cdn.example.com', 'analytics.example.com'], // Optional: Exclude specific domains }, });

[abc123] 200 GET https://example.com/api/users?page=1&limit=10 [def456] 404 POST https://api.example.org/data/process?format=json&version=2.1 [ghi789] 500 PUT https://service.example.net/update?id=12345&token=abc123

[abc123] 200 GET https://example.com/api/users [def456] 404 POST https://api.example.org/data/process [ghi789] 500 PUT https://service.example.net/update

The HAR Detail tool allows you to view detailed information about specific requests in a HAR file. You can view headers and optionally body content:

// Example usage through MCP protocol const result = await mcpClient.callTool('har_detail', { filePath: '/path/to/your/file.har', hashes: 'abc123', // Single hash or comma-separated list like 'abc123,def456,ghi789' showBody: true, // Set to false to hide request/response bodies });

ENTRY [abc123] === REQUEST === GET https://example.com/api/users?page=1&limit=10 --- Headers --- Accept: application/json User-Agent: Mozilla/5.0 === RESPONSE === 200 OK --- Headers --- Content-Type: application/json Cache-Control: no-cache --- Body --- { "users": [ { "id": 1, "name": "John Doe" }, { "id": 2, "name": "Jane Smith" } ], "page": 1, "total": 42 }

The Domain List tool helps you see all unique domains in a HAR file, which is useful for filtering:

// Example usage through MCP protocol const result = await mcpClient.callTool('domain_list', { filePath: '/path/to/your/file.har', });

example.com api.example.org service.example.net cdn.example.com analytics.example.com

# Build the project npm run build # Run tests npm test

This tool uses the Model Context Protocol (MCP), which allows AI assistants to interact with external tools and services. Learn more about MCP athttps://github.com/modelcontextprotocol/typescript-sdk.

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