First off, don’t post a new reply asking for any help only 5 mins after posting your original post or that will put some people off helping as it might sound like you are demanding.
Secondly, please put your code in the code block function using the icon when selecting the text and don’t list it with numbers etc.

As for the issue itself with your code, when it mentions parsing error: unexpected token, that will mean that you should check your code and make sure that you have equal numbers of opening and closing parentheses and curly brackets in your code.
With the parsing error: unexpected token import error, it will most often mean that the error is in your page code and not your backend file.
So, in simple terms, you need to make sure that you have matching pairs of open and closed parentheses which are the ( and the ), as well as matching pairs of curly brackets which are the { and the }.
Going through your code you are missing the opening curly bracket on line 8 and another curly bracket after line 31 and before line 32.
Also, you probably don’t need the end comma ‘,’ at the end of line 8 too as that is the end of the values in the array. Try it without, however if you get the red icon on that line then simply add it back if needed.
So it should be like this.
import {getJSON} from 'wix-fetch';
const url = "https://api.exchangeratesapi.io/latest";
let currencyOptions = [
{ "value": "USD", "label": "US Dollars" },
{ "value": "EUR", "label": "Euros" },
{ "value": "JPY", "label": "Japanese Yen" }
];
$w.onReady(function() {
populateDropdowns();
$w('#calculateButton').onClick((event) => {
calculateCurrency();
})
});
function populateDropdowns() {
$w('Dropdown').options = currencyOptions;
$w('Dropdown').selectedIndex = 0;
}
function calculateCurrency() {
let initialAmount = $w("#sourceAmount").value;
let sourceSymbol = $w("#sourceCurrency").value;
let targetSymbol = $w("#targetCurrency").value;
let fullUrl = `${url}?base=${sourceSymbol}&symbols=${targetSymbol}`;
getJSON(fullUrl)
.then(json => {
$w("#targetAmount").value = initialAmount * json.rates[targetSymbol];
}
)}