The following is a similar query to the one in [Glorfindel][1]'s [answer][2], but implemented as a runnable snippet and using the [Stack Exchange API][3] (as the load on the API can be quite heavy, please procure the API key on [StackApps][4] or use an existing one).

The generated report includes the following stats:

- link to the answering user profile
- number of answers given by the user
- total reputation earned via bounties
- total score of answers

Example report for a user id 953887 on Stack Overflow:

<img src="https://i.sstatic.net/3alv9.png" width="500" alt="sample report for a user id 953887 on Stack Overflow" />

---

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

    /// <reference types="@userscripters/stackexchange-api-types" />

    const API_BASE = "https://api.stackexchange.com";
    const API_VER = 2.3;

    /**
     * @summary delays script execution
     * @param {number} [ms] milliseconds to delay for
     * @returns {Promise<void>}
     */
    const delay = (ms = 100) => new Promise((resolve) => setTimeout(resolve, ms));

    /**
     * @summary makes a table cell
     * @param {string| Node} content
     * @returns {HTMLTableCellElement}
     */
    const makeCell = (content) => {
        const td = document.createElement("td");
        td.append(content);
        return td;
    };

    /**
     * @summary makes a table row
     * @param {Array<string | Node>} columns
     * @returns {HTMLTableRowElement}
     */
    const makeRow = (...columns) => {
        const tr = document.createElement("tr");
        const cells = columns.map(makeCell);
        tr.append(...cells);
        return tr;
    };

    const makeLink = (url, label) => {
        const a = document.createElement("a");
        a.target = "_blank";
        a.href = url;
        a.innerText = label;
        return a;
    };

    /**
     * @see https://api.stackexchange.com/docs/questions-on-users
     *
     * @summary gets question info by user id
     * @param {number} id user id
     * @param {{ site?: string, page?: number, ...rest }} [options] request configuration
     * @returns {Promise<StackExchangeAPI.Question[]>}
     */
    const getQuestions = async (id, { site = "stackoverflow", page = 1, ...rest }) => {
        const url = new URL(`${API_BASE}/${API_VER}/users/${id}/questions`);
        url.search = new URLSearchParams({
            site,
            page: page.toString(),
            ...rest,
        }).toString();

        const res = await fetch(url.toString());
        if (!res.ok) return [];

        const { items = [], has_more = false, backoff } = await res.json();

        if (backoff) {
            await delay(backoff * 1e3);
            return getQuestions(id, { site, page, ...rest });
        }

        if (has_more) {
            items.push(
                ...(await getQuestions(id, {
                    site,
                    page: page + 1,
                    ...rest,
                }))
            );
        }

        return items;
    };

    /**
     * @see https://api.stackexchange.com/docs/answers-on-questions
     *
     * @summary gets answers by question ids
     * @param {number[]} ids user id
     * @param {{ site?: string, page?: number, ...rest }} [options] request configuration
     * @returns {Promise<StackExchangeAPI.Answer[]>}
     */
    const getAnswers = async (ids, { site = "stackoverflow", page = 1, ...rest }) => {
        const url = new URL(`${API_BASE}/${API_VER}/questions/${ids.join(";")}/answers`);
        url.search = new URLSearchParams({
            site,
            page: page.toString(),
            ...rest,
        }).toString();

        const res = await fetch(url.toString());
        if (!res.ok) return [];

        const { items = [], has_more = false, backoff } = await res.json();

        if (backoff) {
            await delay(backoff * 1e3);
            return getAnswers(ids, { site, page, ...rest });
        }

        if (has_more) {
            items.push(
                ...(await getAnswers(ids, {
                    site,
                    page: page + 1,
                    ...rest,
                }))
            );
        }

        return items;
    };

    /**
     * @template {unknown} T
     *
     * @summary splits an array into chunks
     * @param {T[]} arr array to split
     * @param {number} size chunk size
     * @returns {T[][]}
     */
    const chunkify = (arr, size) => {
        /** @type {T[][]} */
        const output = [];

        arr.forEach((e, i) => {
            let chunk = output[output.length - 1];
            i % size ? chunk.push(e) : output.push([e]);
        });

        return output;
    };

    /**
     * @summary sums score of all posts
     * @param {Array<StackExchangeAPI.Post>} posts
     * @returns {number}
     */
    const getTotalScore = (posts) => posts.reduce((a, c) => a + c.score, 0);

    window.addEventListener("load", () => {
        const apiKeyInput = document.getElementById("api_key");
        const accountInput = document.getElementById("account_id");
        const submit = document.getElementById("search");
        const siteInput = document.getElementById("site");
        const progress = document.getElementById("status");
        progress.value = 0;

        submit.addEventListener("click", async () => {
            const { value: key } = apiKeyInput;
            const { value: site } = siteInput;
            const { value: userId } = accountInput;

            const report = document.querySelector("#preview > tbody");

            const questions = await getQuestions(userId, { key, site });

            progress.value = 25;

            const questionIds = questions.map(({ question_id }) => question_id);

            const chunks = chunkify(questionIds, 100); // max number of ids is 100
            const { length: numChunks } = chunks;

            const progressValuePerChunk = 75 / numChunks;

            /** @type {Record<string, { answers: StackExchangeAPI.Answer[], link: string, name: string }>} */
            const answers = {};
            for (const chunk of chunks) {
                const items = await getAnswers(chunk, { key, site, filter: "!nKzQUREjAc" });
                items.forEach((answer) => {
                    const { owner: { user_id, display_name, link } } = answer;
                    if (!answers[user_id]) answers[user_id] = { answers: [] };
                    const userAnswers = answers[user_id];
                    userAnswers.answers.push(answer);
                    userAnswers.link = link;
                    userAnswers.name = display_name;
                });

                progress.value += progressValuePerChunk;
            }

            report.querySelectorAll("tr").forEach((r) => r.remove());

            const answersByUser = Object.values(answers);

            answersByUser.sort((a, b) => getTotalScore(b.answers) - getTotalScore(a.answers));

            const rows = answersByUser.flatMap(({ link, name, answers }) => {
                const userLink = makeLink(link, name);
                const totalAnswers = answers.length;
                const totalBounties = answers.reduce((c, a) => c + (a.awarded_bounty_amount || 0), 0);
                const totalScore = getTotalScore(answers);

                return makeRow(
                    userLink,
                    totalAnswers,
                    totalBounties,
                    totalScore
                );
            });

            report.append(...rows);

            report.closest("table").classList.remove("hidden");

            progress.value = 100;
        });

    });

<!-- language: lang-css -->

    label {
      display: block;
      font-weight: 600;
    }

    caption,
    label {
      font-weight: 600;
      margin-bottom: 0.5vh;
    }

    table {
      margin-top: 4vh;
      border-collapse: collapse;
    }

    th,
    td {
      padding: 2vh 2vw;
      border: 1px solid lightgray;
    }

    .hidden {
      display: none;
    }

    progress {
      margin-top: 2vh;
      height: 20px;
      border-radius: 0;
    }

<!-- language: lang-html -->

    <form>
      <label for="api_key">SE API key</label>
      <input id="api_key" type="text" title="SE API key" placeholder="abc12345" />
      
      <label for="site">Site API Slug</label>
      <input id="site" type="text" title="Site API slug" placeholder="stackoverflow" value="stackoverflow" />

      <label for="account_id">User Account Id</label>
      <input id="account_id" type="text" title="Account Id" placeholder="12345" />
      <button id="search" type="button">Get Info</button>
    </form>

    <progress id="status" max="100" value="0"></progress>

    <table id="preview" class="hidden" cellspacing="0">
      <caption>Stack Exchange Post Activity</caption>
      <thead>
        <tr>
          <th>Account</th>
          <th>Answers</th>
          <th>Bounty rep</th>
          <th>Score</th>
        </tr>
      </thead>
      <tbody>
      </tbody>
    </table>

<!-- end snippet -->


  [1]: https://meta.stackexchange.com/users/295232/glorfindel
  [2]: https://meta.stackexchange.com/a/377012/786798
  [3]: https://api.stackexchange.com/docs
  [4]: https://stackapps.com/apps/oauth/register