Checking JSON and XML Responses
Working with JSON Responses
JSON is the most common API response format. Postman automatically pretty-prints JSON in the response viewer, and pm.response.json() lets scripts parse it directly into a usable object for assertions.
Working with XML Responses
For APIs that return XML, Postman's response viewer can render it in a readable tree format. In scripts, xml2Json() can convert the XML body into a JSON-like object so it can be validated the same way.
Choosing the Right Checks
| Format | Parsing Method | Common Check |
|---|---|---|
| JSON | pm.response.json() | Field values, structure |
| XML | xml2Json(pm.response.text()) | Element/attribute values |
Content-Type Awareness
Checking the Content-Type header before parsing helps a test script handle both formats gracefully, especially when an API can return either one.
Once individual responses can be validated, the next step is linking multiple requests together by chaining them with scripts.
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