如何在 Logic App 中将字符串解析为 JSON？答案

【问题标题】：How do parse string as JSON in Logic App?如何在 Logic App 中将字符串解析为 JSON？
【发布时间】：2019-02-21 03:09:21
【问题描述】：

我有 JSON，下面是我从外部实体接收的。如您所见，requestbody 参数显示为 string，即使它是 JSON。那么如何取消转义以便在下游正确解析它呢？

{
  "emailaddress": "174181@mycomp.com",
  "requestbody": "{\"Id\":\"57518139-687c-4223-b08b-342f4ff426ca\",\"Properties\":{\"PrincipalId\":\"d701e7aa-5a0a-4c4a-81be-4c4b7a3967ce\",\"RoleDefinitionId\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f/providers/Microsoft.Authorization/roleDefinitions/8e3af657-a8ff-443c-a75c-2fe8c4bcb635\",\"Scope\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f\"}}"
}

【问题讨论】：

标签： json azure-logic-apps json-deserialization

【解决方案1】：

使用解析 JSON 操作，如下所示：

内容：

{
  "emailaddress": "174181@mycomp.com",
  "requestbody": "{\"Id\":\"57518139-687c-4223-b08b-342f4ff426ca\",\"Properties\":{\"PrincipalId\":\"d701e7aa-5a0a-4c4a-81be-4c4b7a3967ce\",\"RoleDefinitionId\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f/providers/Microsoft.Authorization/roleDefinitions/8e3af657-a8ff-443c-a75c-2fe8c4bcb635\",\"Scope\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f\"}}"
}

架构

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "properties": {
        "emailaddress": {
            "type": "string"
        },
        "requestbody": {
            "type": "string"
        }
    },
    "required": [
        "emailaddress",
        "requestbody"
    ],
    "type": "object"
}

初始化变量

-Name = Variable Name
-Type = Object
-Value = json(body('Parse_JSON')['requestbody'])

现在您可以提取 Json 字符串的属性，如下所示：

variables('jsonobj')?['Properties']

我的示例的完整代码视图：

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "Initialize_variable": {
                "inputs": {
                    "variables": [
                        {
                            "name": "jsonobj",
                            "type": "Object",
                            "value": "@json(body('Parse_JSON')['requestbody'])"
                        }
                    ]
                },
                "runAfter": {
                    "Parse_JSON": [
                        "Succeeded"
                    ]
                },
                "type": "InitializeVariable"
            },
            "Parse_JSON": {
                "inputs": {
                    "content": {
                        "emailaddress": "174181@mycomp.com",
                        "requestbody": "{\"Id\":\"57518139-687c-4223-b08b-342f4ff426ca\",\"Properties\":{\"PrincipalId\":\"d701e7aa-5a0a-4c4a-81be-4c4b7a3967ce\",\"RoleDefinitionId\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f/providers/Microsoft.Authorization/roleDefinitions/8e3af657-a8ff-443c-a75c-2fe8c4bcb635\",\"Scope\":\"/subscriptions/64ba3e4c-45e3-4d55-8132-6731cf25547f\"}}"
                    },
                    "schema": {
                        "$schema": "http://json-schema.org/draft-04/schema#",
                        "properties": {
                            "emailaddress": {
                                "type": "string"
                            },
                            "requestbody": {
                                "type": "string"
                            }
                        },
                        "required": [
                            "emailaddress",
                            "requestbody"
                        ],
                        "type": "object"
                    }
                },
                "runAfter": {},
                "type": "ParseJson"
            },
            "Response": {
                "inputs": {
                    "body": "@variables('jsonobj')?['Properties']",
                    "statusCode": 200
                },
                "kind": "Http",
                "runAfter": {
                    "Initialize_variable": [
                        "Succeeded"
                    ]
                },
                "type": "Response"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {},
        "triggers": {
            "manual": {
                "inputs": {
                    "schema": {}
                },
                "kind": "Http",
                "type": "Request"
            }
        }
    }
}

【讨论】：

【解决方案2】：

最简单的方法是使用这个表达式：

@json(outputs('Mock_example_data').requestbody)

下面是一个使用Compose 操作模拟您的数据和另一个Compose 操作作为简单概念证明的示例。

【讨论】：

数组呢？
如果 json() 函数不起作用，您可以将输入包装在 array() 工作流函数中。