Ways to confirm the presence of specific keys in a JSON:

After successfully converting an excel sheet's content into a JSON format, my next task is to perform some validation on it.

The requirement is to ensure that the jsonData variable contains specific keys in a particular order: Breakfast, Lunch, Snack, and Dinner.

To start with the assertion process, I attempted the following test:

const jsonData = [{  
  "Breakfast": "Cereal",
  "Lunch": "Chicken",
  "Snack": "Biscuit",
  "Dinner": "Pork",
  "Drinks": "Water"
}]

expect(jsonData).to.be.an('array').that.contains.keys('Breakfast')

Unfortunately, running this code resulted in an error: https://i.sstatic.net/3XJuF.png

javascriptjsoncypresschaiassertion

Answer №1

It seems that the to.contain.keys method can only be applied to the first object in an array, not the entire array itself.

You may want to try extracting that first item and then applying the assertion.

const jsonData = [{  
  "Breakfast": "Cereal",
  "Lunch": "Chicken",
  "Snack": "Biscuit",
  "Dinner": "Pork",
  "Drinks": "Water"
}]

expect(jsonData).to.be.an('array')

const firstItem = jsonData[0]
expect(firstItem).to.contain.keys('Breakfast')

Alternative syntax for chai keys assertion

After reviewing the documentation, it appears that the correct syntax for checking keys might be using .include.any.keys.

You could try doing:

expect(firstItem).to.include.any.keys('Breakfast')

Simpler approach

If you simply need to check if "Breakfast" exists, you can compare it to undefined:

For the first object:

expect(jsonData[0].Breakfast).to.not.eq(undefined)

For every object in the array:

jsonData.forEach(item => {
  expect(item.Breakfast).to.not.eq(undefined)
}

Answer №2

Thank you all for your valuable contributions. After some consideration, I have finalized the following code snippet. Feel free to share any suggestions for improvement or alternative approaches.

// Referencing data from testdata.json
const columns = testdata.Meals.columns

const keys = Object.keys(data[0])
const values = Object.values(data[0])

const data = [{
  "Breakfast": "Toast",
  "Lunch": "Salad",
  "Snack": "Fruit",
  "Dinner": "Steak",
  "Drinks": "Juice"
}]

cy.get(columns).each(($element, index, $list) => {
  expect(data[0]).to.haveOwnProperty(keys[index])

  // Check the order of key-value pairs
  if (index == 0) {
    expect(keys[i]).to.equal(columns[index])
    expect(values[index]).to.equal(context.breakfastName)
  } else if (index == 2) {
    expect(keys[index]).to.equal(columns[index])
    expect(values[index]).to.equal(context.snackName)
  } else if (index == 4) {
    expect(keys[index]).to.equal(columns[index])
    expect(values[index]).to.equal(context.drinkName)
  }
})

The contents of testdata.js:

{
 "Meals": {
  "columns": [
    "Breakfast",
    "Lunch",
    "Snack",
    "Dinner",
    "Drinks"
  ]
 }
}

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