JSON 文件

JSON 加载器使用 JSON 指针 来定位 JSON 文件中要定位的键。

无 JSON 指针示例

最简单的使用方式是，不指定 JSON 指针。加载器将加载 JSON 对象中找到的所有字符串。

示例 JSON 文件

{
  "texts": ["This is a sentence.", "This is another sentence."]
}

示例代码

import { JSONLoader } from "langchain/document_loaders/fs/json";

const loader = new JSONLoader("src/document_loaders/example_data/example.json");

const docs = await loader.load();
/*
[
  Document {
    "metadata": {
      "blobType": "application/json",
      "line": 1,
      "source": "blob",
    },
    "pageContent": "This is a sentence.",
  },
  Document {
    "metadata": {
      "blobType": "application/json",
      "line": 2,
      "source": "blob",
    },
    "pageContent": "This is another sentence.",
  },
]
*/

使用 JSON 指针示例

您可以通过选择要从 JSON 对象中提取字符串的键来执行更高级的场景。

在此示例中，我们只想从“from”和“surname”条目中提取信息。

{
  "1": {
    "body": "BD 2023 SUMMER",
    "from": "LinkedIn Job",
    "labels": ["IMPORTANT", "CATEGORY_UPDATES", "INBOX"]
  },
  "2": {
    "body": "Intern, Treasury and other roles are available",
    "from": "LinkedIn Job2",
    "labels": ["IMPORTANT"],
    "other": {
      "name": "plop",
      "surname": "bob"
    }
  }
}

示例代码

import { JSONLoader } from "langchain/document_loaders/fs/json";

const loader = new JSONLoader(
  "src/document_loaders/example_data/example.json",
  ["/from", "/surname"]
);

const docs = await loader.load();
/*
[
  Document {
    "metadata": {
      "blobType": "application/json",
      "line": 1,
      "source": "blob",
    },
    "pageContent": "BD 2023 SUMMER",
  },
  Document {
    "metadata": {
      "blobType": "application/json",
      "line": 2,
      "source": "blob",
    },
    "pageContent": "LinkedIn Job",
  },
  ...
]