Parsing objects of a JSON for input validation - json

Question

I want to use a database of valid ICAO and IATA airport codes for a discord bot input in typescript. However, I am not quite sure how to call the "icao" and "iata" contstructor of all objects, as each one is defined differently and there are thousands: e.g.:
"00AK": {
"icao": "00AK",
"iata": "",
"name": "Lowell Field",
"city": "Anchor Point",
"state": "Alaska",
"country": "US",
"elevation": 450,
"lat": 59.94919968,
"lon": -151.695999146,
"tz": "America\/Anchorage"
},
"00AL": {
"icao": "00AL",
"iata": "",
"name": "Epps Airpark",
"city": "Harvest",
"state": "Alabama",
"country": "US",
"elevation": 820,
"lat": 34.8647994995,
"lon": -86.7703018188,
"tz": "America\/Chicago"
},
The bot uses the following to provide the METAR of a specific airport:
name: 'metar',
description: 'Provides the METAR report of the requested airport',
category: CommandCategory.UTILS,
executor: async (msg) => {
const splitUp = msg.content.replace(/\.metar\s+/, ' ').split(' ');
if (splitUp.length <= 1) {
await msg.reply('please provide an ICAO airport code.');
return Promise.resolve();
}
const icaoArg = splitUp[1];
if (icaoArg.length !== 4) {
await msg.reply('please provide an ICAO airport code.');
return Promise.resolve();
}
request({
method: 'GET',
url: `https://avwx.rest/api/metar/${icaoArg}`,
headers: {
Authorization: process.env.METAR_TOKEN },
}, async (error, response, body) => {
const metarReport = JSON.parse(body);å
const metarEmbed = makeEmbed({
title: `METAR Report | ${metarReport.station}`,
description: makeLines([
'**Raw Report**',
metarReport.raw,
,
'**Basic Report:**',
`**Time Observed:** ${metarReport.time.dt}`,
`**Station:** ${metarReport.station}`,
`**Wind:** ${metarReport.wind_direction.repr} at ${metarReport.wind_speed.repr}kts`,
`**Visibility:** ${metarReport.visibility.repr}${metarReport.units.visibility}`,
`**Temperature:** ${metarReport.temperature.repr}C`,
`**Dew Point:** ${metarReport.dewpoint.repr}C`,
`**Altimeter:** ${metarReport.altimeter.value.toString()} ${metarReport.units.altimeter}`,
]),
fields: [
{
name: 'Unsure of how to read the raw report?',
value: 'Type \'**.metarhow**\' to learn how to read raw METARs',
inline: false
},
],
footer: { text: 'This METAR report may not accurately reflect the weather in the simulator. However, it will always be similar to the current conditions present in the sim.' },
});
await msg.channel.send({ embeds: [metarEmbed] });
});
},
};
Currently, if a user provides an ICAO that's not valid the bot crashes, or if they provide a valid IATA, the discord api throws the user an error to provide a valid ICAO code. How would I go about cross referencing the user argument with the JSON so the bot does not crash when inputting an invalid ICAO? Thanks