How to fetch a JSON property in the response body through Azure APIM policies

Vijay Sharma 0 Reputation points
2023-04-29T20:06:42.33+00:00

Hi,

My requirement is to call an OAuth token URL, get the OAuth token in the response body and store it in a cache. The value from cache will be used in next API call. I am able to get the OAuth token via below code in the response body. However, I cannot fetch the token from response body to store it in cache store.

After setting the inbound set-body, I get the response as below. But I cannot figure out how can I fetch the value of access_token from this response body. Can anyone please help me out here?

{
	"access_token": "access_token_some_value",
	"expires_in": 86400,
	"token_type": "Bearer"
}
<policies>
    <inbound>
        <base />
        <set-body template="liquid">
           {
              "client_id": "{{ClientId-named-value}}",
              "client_secret": "{{clientsecret-named-value}}",
              "audience": "{{audience-named-value}}",
              "grant_type": "{{granttype-named-value}}"
            }
            </set-body>
    </inbound>
    <backend>
        <base />
    </backend>
    <outbound>
        <set-body>@{
			var response = context.Response.Body.As<JObject>();
	        return response.ToString();
      	}
		</set-body>
    </outbound>
    <on-error>
        <base />
    </on-error>
</policies>
Azure API Management
Azure API Management
An Azure service that provides a hybrid, multi-cloud management platform for APIs.
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  1. MuthuKumaranMurugaachari-MSFT 22,256 Reputation points
    2023-05-01T15:43:22.67+00:00

    Vijay Sharma Thanks for posting your question in Microsoft Q&A. Based on your description, you got JSON response from API call and like to retrieve access_token from the response body.

    I used the sample response above and using set-body liquid template, you can set the body with access token as below:

    <outbound>
            <set-body template="liquid">
            {
                "access_token": "{{body.access_token}}"
          	}
            </set-body>
            <base />
        </outbound>
    

    Output:

    User's image

    If you are looking to set it in a variable for storing it in cache, you can try the below snippet:

    <outbound>
            <set-variable name="access-token-value" value="@{
                var response = context.Response.Body.As<JObject>();
                return response["access_token"];
            }" />
            <base />
        </outbound>
    

    Note, these are just code snippets, and you can customize it based on the need. I hope this helps with your question and let me know if you face any issues or have any additional questions.