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*   [](/v0.1/)
*   [Modules](/v0.1/docs/modules/)
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*   [Output Parser Types](/v0.1/docs/modules/model_io/output_parsers/types/)
*   XML output parser

On this page

XML output parser
=================

The `XMLOutputParser` takes language model output which contains XML and parses it into a JSON object.

The output parser also supports streaming outputs.

Currently, the XML parser does not contain support for self closing tags, or attributes on tags.

Usage[​](#usage "Direct link to Usage")
---------------------------------------

tip

See [this section for general instructions on installing integration packages](/v0.1/docs/get_started/installation/#installing-integration-packages).

*   npm
*   Yarn
*   pnpm

    npm install @langchain/core

    yarn add @langchain/core

    pnpm add @langchain/core

    import { XMLOutputParser } from "@langchain/core/output_parsers";const XML_EXAMPLE = `<?xml version="1.0" encoding="UTF-8"?><userProfile>  <userID>12345</userID>  <name>John Doe</name>  <email>john.doe@example.com</email>  <roles>    <role>Admin</role>    <role>User</role>  </roles>  <preferences>    <theme>Dark</theme>    <notifications>      <email>true</email>      <sms>false</sms>    </notifications>  </preferences></userProfile>`;const parser = new XMLOutputParser();const result = await parser.invoke(XML_EXAMPLE);console.log(JSON.stringify(result, null, 2));/*{  "userProfile": [    {      "userID": "12345"    },    {      "name": "John Doe"    },    {      "email": "john.doe@example.com"    },    {      "roles": [        {          "role": "Admin"        },        {          "role": "User"        }      ]    },    {      "preferences": [        {          "theme": "Dark"        },        {          "notifications": [            {              "email": "true"            },            {              "sms": "false"            }          ]        }      ]    }  ]}*/

#### API Reference:

*   [XMLOutputParser](https://api.js.langchain.com/classes/langchain_core_output_parsers.XMLOutputParser.html) from `@langchain/core/output_parsers`

Streaming[​](#streaming "Direct link to Streaming")
---------------------------------------------------

    import { XMLOutputParser } from "@langchain/core/output_parsers";import { FakeStreamingLLM } from "@langchain/core/utils/testing";const XML_EXAMPLE = `<?xml version="1.0" encoding="UTF-8"?><userProfile>  <userID>12345</userID>  <roles>    <role>Admin</role>    <role>User</role>  </roles></userProfile>`;const parser = new XMLOutputParser();// Define your LLM, in this example we'll use demo streaming LLMconst streamingLLM = new FakeStreamingLLM({  responses: [XML_EXAMPLE],}).pipe(parser); // Pipe the parser to the LLMconst stream = await streamingLLM.stream(XML_EXAMPLE);for await (const chunk of stream) {  console.log(JSON.stringify(chunk, null, 2));}/*{}{  "userProfile": ""}{  "userProfile": "\n"}{  "userProfile": [    {      "userID": ""    }  ]}{  "userProfile": [    {      "userID": "123"    }  ]}{  "userProfile": [    {      "userID": "12345"    },    {      "roles": ""    }  ]}{  "userProfile": [    {      "userID": "12345"    },    {      "roles": [        {          "role": "A"        }      ]    }  ]}{  "userProfile": [    {      "userID": "12345"    },    {      "roles": [        {          "role": "Admi"        }      ]    }  ]}{  "userProfile": [    {      "userID": "12345"    },    {      "roles": [        {          "role": "Admin"        },        {          "role": "U"        }      ]    }  ]}{  "userProfile": [    {      "userID": "12345"    },    {      "roles": [        {          "role": "Admin"        },        {          "role": "User"        }      ]    }  ]}*/

#### API Reference:

*   [XMLOutputParser](https://api.js.langchain.com/classes/langchain_core_output_parsers.XMLOutputParser.html) from `@langchain/core/output_parsers`
*   [FakeStreamingLLM](https://api.js.langchain.com/classes/langchain_core_utils_testing.FakeStreamingLLM.html) from `@langchain/core/utils/testing`

* * *

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