csgocases price checker

checker.js

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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var __rest = (this && this.__rest) || function (s, e) {
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        t[p] = s[p];
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                t[p[i]] = s[p[i]];
        }
    return t;
};
var STEAM_API_URL = "https://steamcommunity.com/";
var STEAM_MARKET_PRICE_ENDPOINT = STEAM_API_URL + "market/priceoverview";
function printSkinsPrices() {
    return __awaiter(this, void 0, void 0, function () {
        var skinBoxQuery, skinBoxElement, skinsPrices, _i, _a, skinDiv, skin, steamPrice, flattenSkinPrices, reducedSkinPrices;
        return __generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    skinBoxQuery = "#itemsContent";
                    skinBoxElement = document.querySelector(skinBoxQuery);
                    skinsPrices = [];
                    _i = 0, _a = skinBoxElement === null || skinBoxElement === void 0 ? void 0 : skinBoxElement.querySelectorAll("div.gradient-item");
                    _b.label = 1;
                case 1:
                    if (!(_i < _a.length)) return [3 /*break*/, 4];
                    skinDiv = _a[_i];
                    skin = getSkinContents(skinDiv);
                    return [4 /*yield*/, getSkinMarketPrice(skin)];
                case 2:
                    steamPrice = _b.sent();
                    skinsPrices.push({
                        initialSkin: skin,
                        steamPrice: steamPrice
                    });
                    _b.label = 3;
                case 3:
                    _i++;
                    return [3 /*break*/, 1];
                case 4:
                    flattenSkinPrices = skinsPrices.map(function (skinPrice) {
                        var initialSkin = skinPrice.initialSkin;
                        var steamPrice = skinPrice.steamPrice;
                        var initialSkinPrice = initialSkin.price;
                        var lowestPrice = steamPrice.lowestPrice;
                        var medianPrice = steamPrice.medianPrice;
                        var lowestPriceDif = "$" + (initialSkinPrice - lowestPrice).toFixed(2);
                        var lowestPriceDifROI = (lowestPrice / initialSkinPrice * 100).toFixed(2) + "%";
                        var mediaPriceDif = "$" + (initialSkinPrice - medianPrice).toFixed(2);
                        var mediaPriceDifROI = (medianPrice / initialSkinPrice * 100).toFixed(2) + "%";
                        return {
                            skinName: initialSkin.name,
                            "steam.lowestPrice": "$" + lowestPrice,
                            "steam.medianPrice": "$" + medianPrice,
                            "Lowest Price Dif": lowestPriceDif,
                            "Lowest Price ROI": lowestPriceDifROI,
                            "Median Price Dif": mediaPriceDif,
                            "Median Price ROI": mediaPriceDifROI
                        };
                    });
                    reducedSkinPrices = flattenSkinPrices.reduce(function (teste, _a) {
                        var skinName = _a.skinName, x = __rest(_a, ["skinName"]);
                        teste[skinName] = x;
                        return teste;
                    }, {});
                    console.table(reducedSkinPrices);
                    return [2 /*return*/];
            }
        });
    });
}
function getSkinMarketPrice(skin) {
    return __awaiter(this, void 0, void 0, function () {
        var url, apiResponse, body, lowestPrice, medianPrice;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    url = STEAM_MARKET_PRICE_ENDPOINT +
                        "?appid=730&currency=1&market_hash_name=".concat(skin.statTrack ? "StatTrak™ " : "").concat(skin.name);
                    return [4 /*yield*/, fetch(url, {
                            method: "GET",
                        })];
                case 1:
                    apiResponse = _a.sent();
                    return [4 /*yield*/, apiResponse.json()];
                case 2:
                    body = _a.sent();
                    lowestPrice = body["lowest_price"];
                    medianPrice = body["median_price"];
                    if (!lowestPrice) {
                        lowestPrice = "0";
                    }
                    if (!medianPrice) {
                        medianPrice = "0";
                    }
                    return [2 /*return*/, {
                            lowestPrice: medianPrice.replace("$", ""),
                            medianPrice: medianPrice.replace("$", ""),
                        }];
            }
        });
    });
}
function getSkinContents(skinDiv) {
    var contentElement = skinDiv === null || skinDiv === void 0 ? void 0 : skinDiv.querySelector("div.item-content");
    var statTrack = isStatTrack(contentElement);
    var name = getContentName(contentElement);
    var price = getContentPrice(contentElement);
    return { name: name, statTrack: statTrack, price: price };
}
function isStatTrack(contentsElement) {
    var imageTextElement = contentsElement.querySelector("span.ng-scope");
    return imageTextElement != undefined;
}
function getContentName(contentElement) {
    var bottomElement = contentElement.querySelector("div.item-bottom");
    var nameElement = bottomElement.firstElementChild;
    var rarityElement = bottomElement.lastElementChild;
    var name = nameElement.textContent;
    if (rarityElement.textContent != "") {
        name += "(".concat(rarityElement.textContent, ")");
    }
    return name.trim().replaceAll("\n", "").replace(/\s+/g, " ");
}
function getContentPrice(contentElement) {
    var topElement = contentElement.querySelector("div.item-top");
    var priceElement = topElement.querySelector("span.resell-price-span");
    var priceString = priceElement.textContent;
    priceString = priceString.replace("$", "");
    return +priceString;
}
printSkinsPrices();

checker.ts

const STEAM_API_URL = "https://steamcommunity.com/";
const STEAM_MARKET_PRICE_ENDPOINT = STEAM_API_URL + "market/priceoverview";


async function printSkinsPrices() {
  const skinBoxQuery = `#itemsContent`;
  const skinBoxElement = document.querySelector(skinBoxQuery);
  const skinsPrices: SkinPrice[] = []
  for (let skinDiv of skinBoxElement?.querySelectorAll("div.gradient-item")!) {
  
    const skin = getSkinContents(skinDiv);
    const steamPrice = await getSkinMarketPrice(skin);
    
    skinsPrices.push({
      initialSkin: skin,
      steamPrice: steamPrice
    }
    )
  }
  const flattenSkinPrices = skinsPrices.map(skinPrice => {
    const initialSkin = skinPrice.initialSkin
    const steamPrice = skinPrice.steamPrice

    const initialSkinPrice = initialSkin.price;
    const lowestPrice = steamPrice.lowestPrice;
    const medianPrice = steamPrice.medianPrice;



    const lowestPriceDif = "$" + (initialSkinPrice - lowestPrice).toFixed(2)
    const lowestPriceDifROI = (lowestPrice / initialSkinPrice * 100).toFixed(2) + "%"

    const mediaPriceDif = "$" + (initialSkinPrice - medianPrice).toFixed(2)
    const mediaPriceDifROI = (medianPrice / initialSkinPrice * 100).toFixed(2) + "%"
 
    return {
      skinName: initialSkin.name,
      "steam.lowestPrice": "$" + lowestPrice,
      "steam.medianPrice": "$" + medianPrice,
      "Lowest Price Dif": lowestPriceDif,
      "Lowest Price ROI": lowestPriceDifROI,
      "Median Price Dif": mediaPriceDif,
      "Median Price ROI": mediaPriceDifROI
    }
  })
  
  const reducedSkinPrices = flattenSkinPrices.reduce((teste, { skinName, ...x }) => {
    teste[skinName] = x;
    return teste
  }, {})
  console.table(reducedSkinPrices)

}

async function getSkinMarketPrice(skin: Skin): Promise<SteamPrice> {
  const url =
    STEAM_MARKET_PRICE_ENDPOINT +
    `?appid=730&currency=1&market_hash_name=${skin.statTrack ? "StatTrak™ " : ""}${skin.name}`;
  const apiResponse = await fetch(url, {
    method: "GET",
  });  
  const body = await apiResponse.json();

  let lowestPrice = body["lowest_price"]
  let medianPrice = body["median_price"]
  if (!lowestPrice) {
    lowestPrice = "0"
  }
  if (!medianPrice) {
    medianPrice = "0"
  }
  return {
    lowestPrice:medianPrice.replace("$", ""),
    medianPrice: medianPrice.replace("$", ""),
  };
}   
   
function getSkinContents(skinDiv: Element): Skin {
  const contentElement = skinDiv?.querySelector("div.item-content")!;
  const statTrack = isStatTrack(contentElement);
  const name = getContentName(contentElement);
  const price = getContentPrice(contentElement);
  return { name, statTrack, price };
}

function isStatTrack(contentsElement: Element) {
  const imageTextElement = contentsElement.querySelector("span.ng-scope");
  return imageTextElement != undefined;
}
function getContentName(contentElement: Element) {
  const bottomElement = contentElement.querySelector("div.item-bottom")!;
  const nameElement = bottomElement.firstElementChild!;
  const rarityElement = bottomElement.lastElementChild!;
  let name = nameElement.textContent!;

  if (rarityElement.textContent != "") {
    name += `(${rarityElement.textContent})`;
  }

  return name.trim().replaceAll("\n", "").replace(/\s+/g, " ");
}

function getContentPrice(contentElement: Element) {
  const topElement = contentElement.querySelector("div.item-top")!;
  const priceElement = topElement.querySelector("span.resell-price-span")!;
  let priceString = priceElement.textContent!;
  priceString = priceString.replace("$", "");
  return +priceString;
}

printSkinsPrices();

interface Skin {
  name: string;
  statTrack: boolean;
  price: number;
}

interface SteamPrice{ 
  lowestPrice: number,
  medianPrice: number,

}

interface SkinPrice {
  initialSkin: Skin,
  steamPrice: SteamPrice
  
}

You have to install the extension "CORS Unblock" and it also only works on the shop page