How to add flow variables to JSON payload

Google Cloud Apigee
1

I have extracted some query parameters and URI path parameters in request flow. I want to add these variables to the request payload.I have extracted using Extract Variable Policy. How to add these to my JSON request payload?

My Extract Variable Policy is:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ExtractVariables async="false" continueOnError="false" enabled="true" name="EV-GetStartDate">
    <DisplayName>EV-GetPathType</DisplayName>
    <URIPath name="index" type="string">
        <Pattern ignoreCase="true">/{index}</Pattern>
    </URIPath>
    <QueryParam name="type" type="string">
        <Pattern ignoreCase="true">{type}</Pattern>
    </QueryParam>
    <VariablePrefix>queryinfo</VariablePrefix>
    <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
</ExtractVariables>
2

@Preethi Ravichandran

I like to do this with a Javascript policy on the request flow. Please see below an example:

// read your flow variables
var index = context.getVariable("queryinfo.index");
var type  = context.getVariable("queryinfo.type");

// generate new JSON payload
var newJSON = {'index': index, 'type': type};

// write request payload
context.setVariable('request.content', JSON.stringify(newJSON));
3

But I need to add the flow variables to the input json payload.

4

If you would like to modify your existing json request, using javascript read in the request content as a json object and manipulate it

var requestJson = JSON.parse(context.getVariable('request.content'));
var type = context.getVariable('queryinfo.type');
requestJson.type = type;
context.setVariable('request.content', JSON.stringify(requestJson));
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