How to get value from key response?

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I’m not sure why you would need to use forEach() here - Is it returning an array of objects?

Wouldn’t that work?

pm.test("Validate response code 400", function () {
    pm.response.to.have.status(400);
      
});

const jsonData = pm.response.json();

pm.test("Check response description is as defined", () => {
    pm.expect(jsonData).to.be.an("object");
    pm.expect(jsonData.length).to.be.greaterThan(0);
    pm.expect(jsonData).to.have.property("description");
    pm.expect(jsonData.description).to.be.a("string");
    pm.expect(jsonData.description).to.equal("Cannot create 'xxx' without 'xxx'");
});
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