JsonPoke 1.1.2

Usage:

<JsonPoke ContentPath="[JSON_FILE]" Query="[JSONPath]" Value="[VALUE]" />
<JsonPoke ContentPath="[JSON_FILE]" Query="[JSONPath]" RawValue="[JSON]" />
<JsonPoke Content="[JSON]" Query="[JSONPath]" Value="[VALUE]" />

You must either provide the path to a JSON file via ContentPath or raw JSON content via Content.

The Value can be an item group, and in that case, it will be inserted into the JSON node matching the JSONPath expression Query as an array. RawValue can be used to provide an entire JSON fragment as a string, with no conversion to an MSBuild item at all.

The existing JSON node will determine the data type of the value being written, so as to preserve the original document. Numbers, booleans and DateTimes are properly parsed before serializing to the node.

<PropertyGroup>
    <Json>
{
  "http": {
    "host": "localhost",
    "port": 80,
    "ssl": true
  }
}
    </Json>
</PropertyGroup>

<JsonPoke Content="$(Json)" Query="$.http.host" Value="example.com">
  <Output TaskParameter="Content" PropertyName="Json" />
</JsonPoke>

<JsonPoke Content="$(Json)" Query="$.http.port" Value="80">
  <Output TaskParameter="Content" PropertyName="Json" />
</JsonPoke>

<JsonPoke Content="$(Json)" Query="$.http.ssl" Value="true">
  <Output TaskParameter="Content" PropertyName="Json" />
</JsonPoke>

<Message Importance="high" Text="$(Json)" />

Note how we update multiple values and assign the updated content to the same $(Json) property so it can be used in subsequent updates. The last Message task will render the following JSON:

{
  "http": {
    "host": "example.com",
    "port": 80,
    "ssl": true
  }
}

NOTE: The port value is preserved as a number, as is the ssl boolean.

To force a value to be interpreted as a string, you can surround it with double or single quotes. For example, given the following JSON file:

{
    "http": {
        "ports": [
            "80"
        ]
    }
}

We can replace the ports array with string values as follows (without the explicit quotes, the values would be interpreted as numbers otherwise):

<ItemGroup>
  <HttpPort Include="'8080'" />
  <HttpPort Include="'1080'" />
</ItemGroup>

<JsonPoke ContentPath="http.json" Query="$.http.ports" Value="@(HttpPort)" />

Result:

{
  "http": {
    "ports": [
      "8080", 
      "1080"
    ]
  }
}

It's also possible to write a complex object based on MSBuild item metadata:

<ItemGroup>
  <Http Include="Value">
    <host>localhost</host>
    <port>80</port>
    <ssl>true</ssl>
  </Value>
</ItemGroup>

<JsonPoke ContentPath="http.json" Query="$.http" Value="@(Http)" Properties="host;port;ssl" />

Result:

{
  "http": {
    "host": "localhost",
    "port": 80,
    "ssl": true
  }
}

Note how the native JSON type was automatically inferred, even though everything is basically a string in MSBuild. As noted above, you can surround any of the item metadata values in double or single quotes to force them to be written as strings instead.

The modified JSON nodes can be assigned to an item name using the Result task property, and will contain the item path (matching the Query plus the index if multiple nodes were modified) as well as the Value item metadata containing the raw JSON that was written.

Parameters

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