This example shows the process of cleaning and restructuring Airbnb listing data. It transforms raw JSON records by extracting and reorganizing key fields, such as creating a slug from the listing name, structuring address and review objects, and adding metadata like photos and fees. The code uses Node.js `fs/promises` methods `readFile` and `writeFile` to load and save the data. It also applies a custom `deleteProperties` function to remove a long list of unnecessary fields, while parsing dates with a native `Date` constructor from yyyy-mm-dd strings.