Validating Json array using java script

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You could use something like this to loop through and filter the objects that contain items greater than 300. It will create an array that you can assert against the length of to see if it’s above 1.

I’ve added in a custom error string that shows you why it failed.

pm.test('Is atleast one of the batch in future >=300', () => {
    let result = pm.response.json().filter(arr => arr.items >= 300)
    pm.expect(result.length).to.be.above(1, `Objects matching condition ${result.length}`)
})

This will give you an idea of other assertions that could be made in the pm.expect() statements:

https://www.chaijs.com/api/bdd/