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I have created a REST Endpoint (exposed on force.com site) to allow Webhook messages.

The third party service will POST data to the webhook that looks like this:

Body:

{ "channel": "server", "email": "[email protected]", "messageId": "test-message-37q7z9", "projectId": "oYOQY8rnYw", "replay": true, "timestamp": "2018-12-04T16:22:37.195Z", "traits": { "trait1": 1, "trait2": "test", "trait3": true }, "type": "identify", "userId": "test-user-x1nyrr" }

How can I read the attributes in the traits object? (i.e. trait1, trait2). I should note the attributes in the traits object may increase/decrease in size so this needs to be somewhat dynamic.

This is what I have so far but I'm not sure how to parse the payload.

@RestResource(urlMapping='/webhook') global class WebhookReq { @HttpPost global static String doPost() { //Blob name = RestContext.request.params.get('name'); String traits = RestContext.request.params.get('traits'); RestRequest req = RestContext.request; String result = JSON.deserialize(req.getBody()); return result; } }
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2 Answers 2

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Since the types can be mixed, you need to use either the JSONParser (I would not recommend this) or JSON.deserializeUntyped. Here's the latter method:

Map<String, Object> params = (Map<String, Object>)JSON.deserializeUntyped( RestContext.request.requestBody.toString() ); Map<String, Object> traits = (Map<String, Object>)params.get('traits'); for(String key: traits.keySet()) { Object value = traits.get(key); if(value instanceof integer) { ... } else if(value instanceof string) { ... } else if(value instanceof boolean) { ... } }

Since I don't know what you intend to do with this, I can't really write more, but at this point, you should have everything you need.

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  • May I know why why you don't recommend JSONParser? Commented Dec 28, 2021 at 8:10
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    @NBR It has terrible performance characteristics, is difficult to use correctly, and usually requires writing more code than any other means of parsing JSON. I have literally used it exactly zero times in any code I've written for any project since I started writing Apex code in 2007. Commented Dec 28, 2021 at 9:03
  • Thanks.! How to get the value of object field? I am getting runtime error if I try to use obj.Name. Is there a way without creating a class? Something like obj.get('name' ). obj.get('industry')? This is not a sObject. Commented Dec 28, 2021 at 13:50
  • @NBR See this Q&A and others in our canonical-qa tag that speak about JSON parsing. We've got a lot content available on this topic. Commented Dec 28, 2021 at 15:15
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You can use deserializeUntyped(jsonString) here as below. Refer to the example details on the documentation.

Map<String, Object> myMap = (Map<String, Object>) JSON.deserializeUntyped(req.getBody().toString()); Map<String, Object> traitsMap = (Map<String, Object>)myMap.get('traits'); for(Integer i = 1; i < traitsMap.size(); i++) { system.debug(traitsMap.get('traits'+i)); // will print the value of traits<i> }
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