Attempting to output properties from an Express/Mongo API by utilizing a React.js frontend

I am currently in the process of developing a simplistic fictional sneaker application with the MERN stack. While I wouldn't classify myself as a beginner, I'm also not an expert. I successfully created the backend and generated a json rest-api. However, my struggle lies within the frontend development. My primary issue is trying to access a specific property from an object using console.log.

For instance, let's say I have a route that retrieves an array of sneaker objects. Each object contains details such as the Sneaker Model, Colorway, and Year of release as shown below:

{
    "_id": "5c5dff42489e28576c28cd9e",
    "model": "Air Jordan 11",
    "colorway": "Win Like 82",
    "year": 1997,
    ...
}

I utilized destructuring to extract the sneaker data from my application (Redux) state:

const { sneakers } = this.props.sneaker;

When attempting to log the array of objects using console.log(sneakers), I get the expected results:


(3) [{…}, {…}, {…}]
...

If I wish to access only the second sneaker in the array, I can achieve this by using:

console.log(sneakers[1])

This returns the details of the second sneaker as anticipated. However, when endeavoring to obtain a single property from a specific sneaker like the colorway from the second sneaker, by executing:

console.log(sneakers[1].colorway)

An error occurs:

TypeError: Cannot read property 'colorway' of undefined
.

This issue has left me perplexed, as I assumed that if I could access the entire data of one sneaker, extracting a singular property should be straightforward. There appears to be a mistake in my approach, but identifying it has proven to be challenging.

Answer №1

It seems that the data object may appear in the browser as a convenience, but it may not be fully ready for property access. To work around this issue, I have successfully implemented the following pattern:

const SneakerList = ({sneakers}) => {
  return (
    <div>
    {
      sneakers && sneakers.map(sneaker => {
        return (
          <div>{sneaker.colorway}</div>
        )
      })
    }
    </div>
  )
}

export default SneakerList;

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