Parse XML to JSON and serialize JSON back to XML via @mukundakatta/xml-mcp (npx)

Recipe: XML ↔ JSON via @mukundakatta/xml-mcp

Server: @mukundakatta/xml-mcp v0.1.0 · npx-ready · stdio · no auth Transport: JSON Lines (newline-delimited JSON) — MCP SDK 1.29.0+ Tools: to_json (XML → JSON), to_xml (JSON → XML)

Spawn

npx -y @mukundakatta/xml-mcp

Tool 1: to_json — parse XML to JSON

XML attributes become @_-prefixed keys. Repeated elements become arrays.

Request:

{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"to_json","arguments":{"xml":"<project xmlns=\"http://maven.apache.org/POM/4.0.0\">\n  <modelVersion>4.0.0</modelVersion>\n  <groupId>ai.tani</groupId>\n  <artifactId>registry</artifactId>\n  <version>1.0.0</version>\n  <dependencies>\n    <dependency>\n      <groupId>org.example</groupId>\n      <artifactId>core</artifactId>\n      <version>2.3.1</version>\n    </dependency>\n    <dependency>\n      <groupId>org.example</groupId>\n      <artifactId>utils</artifactId>\n      <version>1.0.0</version>\n      <scope>test</scope>\n    </dependency>\n  </dependencies>\n</project>"}}}

Response (actual):

{"value":{"project":{"modelVersion":"4.0.0","groupId":"ai.tani","artifactId":"registry","version":"1.0.0","dependencies":{"dependency":[{"groupId":"org.example","artifactId":"core","version":"2.3.1"},{"groupId":"org.example","artifactId":"utils","version":"1.0.0","scope":"test"}]},"@_xmlns":"http://maven.apache.org/POM/4.0.0"}}}

Key behaviors:

• xmlns attribute → @_xmlns key
• Two <dependency> elements → dependency array
• Nested structure fully preserved

Tool 2: to_xml — serialize JSON to XML

Keys starting with @_ become XML attributes on the parent element.

Request:

{"jsonrpc":"2.0","id":4,"method":"tools/call","params":{"name":"to_xml","arguments":{"value":{"config":{"database":{"@_engine":"postgres","host":"localhost","port":"5432","name":"tani"},"cache":{"@_provider":"redis","ttl":"3600","enabled":"true"}}}}}}

Response (actual):

<config>
  <database engine="postgres">
    <host>localhost</host>
    <port>5432</port>
    <name>tani</name>
  </database>
  <cache provider="redis">
    <ttl>3600</ttl>
    <enabled>true</enabled>
  </cache>
</config>

Notes

• The @_ prefix convention is bidirectional: to_json produces it, to_xml consumes it
• Values are always strings in the JSON output (no automatic number/boolean coercion)
• Uses fast-xml-parser under the hood