Converting an array of objects to an array of JSON objects in TypeScript

My dilemma lies in the data I have uploaded under the _attachments variable: https://i.sstatic.net/jnFNH.png

My aim is to format this data for insertion in the following structure:

"_attachments": [
  {
    "container": "string",
    "fileName": "string",
    "name": "string",
    "mime": "string",
    "size": 0
  }
]

However, my current approach has been:

for (let key in _attachments) {
  job._attachments[key]['container'] = _attachments[key]['container'];
  job._attachments[key]['fileName'] = _attachments[key]['fileName'];
  job._attachments[key]['name'] = _attachments[key]['name'];
  job._attachments[key]['mime'] = _attachments[key]['mime'];
  job._attachments[key]['size'] = _attachments[key]['size'];
}

This method resulted in the following error:

 Unprocessable Entity

Please note that I am utilizing loopback in this scenario.

jsonmongodbangulartypescript

Answer â„–1

To easily include this in your attachment.josn, simply insert the following:

"identifier": {
  "format": "string",
  "required": true,
  "defaultValueMethod": "generateUUID"
}

This saves you from having to iterate through the data.

Answer â„–2

After reviewing the screenshot, it appears that _attachments is an array. In this case, it is recommended to avoid using for...in for iteration and instead use for..of. Using for..in may return all enumerable properties, including potentially unwanted ones.

For more information on for..of, you can refer to the bottom of this useful MDN resource (Note: for..of is also available in Typescript).

for (let index of _attachments) {
...
}

Another approach would be to utilize a map function:

const result  = _attachments.map( att => ...)

Additionally, if the structure you are mapping to is identical to the original structure, consider using direct assignment instead.

Answer â„–4

Utilizing JSON.stringify allows for easy conversion of objects into JSON format, while JSON.parse can convert JSON back to object form.

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