index.js

const newquery = `query getUserProfile($username: String!) {
    allQuestionsCount {
        difficulty
        count
    }
    matchedUser(username: $username) {
        username
        githubUrl
        twitterUrl
        linkedinUrl
        contributions {
            points
            questionCount
            testcaseCount
        }
        profile {
            realName
            userAvatar
            birthday
            ranking
            reputation
            websites
            countryName
            company
            school
            skillTags
            aboutMe
            starRating
        }
        badges {
            id
            displayName
            icon
            creationDate
        }
        upcomingBadges {
            name
            icon
        }
        activeBadge {
            id
            displayName
            icon
            creationDate
        }
        submitStats {
            totalSubmissionNum {
                difficulty
                count
                submissions
            }
            acSubmissionNum {
                difficulty
                count
                submissions
            }
        }
        submissionCalendar
    }
    recentSubmissionList(username: $username, limit: 20) {
        title
        titleSlug
        timestamp
        statusDisplay
        lang
    }
}`;
const cors = require("cors");
require("dotenv").config();
// module.exports = query;

const userDetailsFetch = async (req, res, query) => {
  let userName = req.params.username;
  console.log(userName);
  let limit = req.query.limit;
  var data = await fetch("https://leetcode.com/graphql", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      Referer: "https://leetcode.com",
    },
    body: JSON.stringify({
      query: query,
      variables: {
        username: userName, //username require
        limit: limit, //only for submission
      },
    }),
  });

  data = await data.json();

  return data.data;
};

const express = require("express");
const app = express();

app.use(
  cors({
    origin: "*", // Allow requests from any origin
    methods: ["GET", "POST", "PUT", "DELETE"], // Allowed HTTP methods
    allowedHeaders: ["Content-Type", "Authorization"], // Allowed request headers
    exposedHeaders: ["Content-Length", "Authorization"], // Headers exposed to the client
    credentials: true, // Allow credentials (cookies, authorization headers, etc.)
    optionsSuccessStatus: 200, // Set the HTTP status code for successful OPTIONS requests
  })
);

app.get("/:username", async (req, res) => {
  try {
    const data = await userDetailsFetch(req, res, newquery);
    console.log(data);
    for (let key in data.matchedUser) {
      console.log(key);
      if (key == "submitStats") console.log(data.matchedUser.submitStats);
    }
    res.send(data.matchedUser.submitStats);
  } catch (error) {
    console.error("Error occurred:", error);
    // Handle the error as needed
    res.status(500).send("Internal Server Error");
  }
});

const port = process.env.PORT || 5000;
app.listen(port, () => {
  console.log(port);
});