Guide on retrieving JSON data and inserting it into an array with the fetch function in JavaScript

Question

Guide on retrieving JSON data and inserting it into an array with the fetch function in JavaScript

Being new to javascript, I am uncertain about how to properly add JSON data to an array. I am using the fetch command to retrieve the JSON file. Below is the code snippet for fetching the JSON file:

fetch("event.json")
  .then(response => response.json())
  .then(json => console.log(json));

I am now facing the challenge of adding this fetched data to an array. Any assistance on this matter would be highly appreciated!

Below is the JSON that I am currently retrieving:

{
   "id": "1",
   "name": "Tim",
   "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a1f5c8cce1c6ccc0c8cd8fc2cecc">[email protected]</a>",
   "event":[{"id":1,"name":"HomeShow"}]
}

The JSON file contains information on multiple individuals. My goal is to fetch this file, store it in an array, and then iterate through it to extract specific values.

javascript arrays json object ecmascript-6

Answer 1

Answer №1

It seems like your JSON file, event.json (or is it actually events.json?), holds an array of objects structured like this:

[
  {
    "id": "1",
    "name": "Tim",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5d0934301d3a303c3431733e3230">[email protected]</a>",
    "event": [{ "id": 1, "name": "HomeShow" }]
  },
  {
    "id": "2",
    "name": "John",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4c062324220c2b212d2520622f2321">[email protected]</a>",
    "event": [{ "id": 1, "name": "HomeShow" }]
  }
]

To filter this data, you can apply the following logic within the promise's callback function:

fetch('event.json')
  .then(res => res.json())
  .then(events => events.filter(event => event.name !== 'John'))

Note that the above code returns a promise, meaning the filtered data will be available asynchronously in the future.

If you want to use this data later, you should encapsulate it in a function, return the promise, and utilize .then on the returned value to access the filtered content:

function getFilteredEvents() {
  return fetch('event.json')
    .then(res => res.json())
    .then(events => events.filter(event => event.name !== 'John'))
}

getFilteredEvents().then(filteredEvents => console.log(filteredEvents))

Answer 2

It seems like your JSON file, event.json (or is it actually events.json?), holds an array of objects structured like this:

[
  {
    "id": "1",
    "name": "Tim",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5d0934301d3a303c3431733e3230">[email protected]</a>",
    "event": [{ "id": 1, "name": "HomeShow" }]
  },
  {
    "id": "2",
    "name": "John",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4c062324220c2b212d2520622f2321">[email protected]</a>",
    "event": [{ "id": 1, "name": "HomeShow" }]
  }
]

To filter this data, you can apply the following logic within the promise's callback function:

fetch('event.json')
  .then(res => res.json())
  .then(events => events.filter(event => event.name !== 'John'))

Note that the above code returns a promise, meaning the filtered data will be available asynchronously in the future.

If you want to use this data later, you should encapsulate it in a function, return the promise, and utilize .then on the returned value to access the filtered content:

function getFilteredEvents() {
  return fetch('event.json')
    .then(res => res.json())
    .then(events => events.filter(event => event.name !== 'John'))
}

getFilteredEvents().then(filteredEvents => console.log(filteredEvents))

Guide on retrieving JSON data and inserting it into an array with the fetch function in JavaScript

Answer №1

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