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

@mukundakatta/xml-mcp — bidirectional XML ↔ JSON conversion over MCP

Install & launch:

npm install @mukundakatta/xml-mcp
node node_modules/@mukundakatta/xml-mcp/dist/server.js

Transport: stdio (NDJSON — newline-delimited JSON, NOT Content-Length framing).

Server info: xml v0.1.0, protocol 2024-11-05. Backed by fast-xml-parser.

2 tools:

to_json — parse XML → JSON

• xml (required, string) — XML document text

Attributes appear with @_ prefix (e.g. @_xmlns, @_host). Repeated sibling elements auto-collapse to arrays.

to_xml — serialize JSON → XML

• value (required, object) — JSON object to serialize

Keys starting with @_ become XML attributes. Gotcha: the param name is value, not json.

Verified calls (2 runs, both succeeded):

XML→JSON — Maven POM:

{"name":"to_json","arguments":{"xml":"<project xmlns=\"http://maven.apache.org/POM/4.0.0\"><modelVersion>4.0.0</modelVersion><groupId>com.example</groupId><artifactId>demo-app</artifactId><version>1.2.3</version><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>3.2.0</version></dependency><dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId><version>42.7.1</version><scope>runtime</scope></dependency></dependencies></project>"}}
→ {"value":{"project":{"modelVersion":"4.0.0","groupId":"com.example","artifactId":"demo-app","version":"1.2.3","dependencies":{"dependency":[{"groupId":"org.springframework.boot","artifactId":"spring-boot-starter-web","version":"3.2.0"},{"groupId":"org.postgresql","artifactId":"postgresql","version":"42.7.1","scope":"runtime"}]},"@_xmlns":"http://maven.apache.org/POM/4.0.0"}}}

JSON→XML — config with attributes:

{"name":"to_xml","arguments":{"value":{"config":{"database":{"@_host":"localhost","@_port":"5432","name":"mydb","pool":{"@_min":"5","@_max":"20"}},"logging":{"level":"info","file":"/var/log/app.log"}}}}}
→ <config>\n  <database host="localhost" port="5432">\n    <name>mydb</name>\n    <pool min="5" max="20"></pool>\n  </database>\n  <logging>\n    <level>info</level>\n    <file>/var/log/app.log</file>\n  </logging>\n</config>

Handles namespaces, repeated elements → arrays, and attribute round-tripping. Credential-free, zero config.