DIYgod/RSSHub · error · InvalidParameterError

Invalid category: . Please refer to the category table in…

Error message

Invalid category: ${category}. Please refer to the category table in the documentation.

What it means

InvalidParameterError thrown by the XJTLU news handler when ctx.req.param('category') is not a key of the categories map (all, anniversary, technology, business, environment, humanities, community, about, stories). Object.hasOwn rejects unknown categories before the URL is constructed, preventing 404s on xjtlu.edu.cn.

Solutions

1. Use one of the documented category keys (all, anniversary, technology, business, environment, humanities, community, about, stories).
2. Omit the category segment to fall back to the 'all' default.
3. If the site added a section, add it to the categories map and rebuild.

const CATEGORY_KEYS = new Set(Object.keys(categories));
function resolveCategory(raw: string | undefined): keyof typeof categories {
    const category = raw ?? 'all';
    if (!CATEGORY_KEYS.has(category)) {
        throw new InvalidParameterError(`Invalid category "${category}". Valid: ${[...CATEGORY_KEYS].join(', ')}`);
    }
    return category as keyof typeof categories;
}

function isXjtluCategory(value: string): value is keyof typeof categories {
    return Object.hasOwn(categories, value);
}

When it happens

Trigger: A request to /xjtlu/news/:lang/:category with a category string that is not one of the nine defined keys, e.g. /xjtlu/news/en/research or a typo like 'tech' instead of 'technology'.

Common situations: Caller guessed a category name not in the route docs; XJTLU restructured news sections and a previously valid key was removed; user passed an empty-but-defined category that is not 'all'.

Related errors

• Invalid language parameter. Use "en" or "zh".
• Invalid keyword
• Invalid rank type
• Invalid type
• Invalid type: . Supported types

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/f668304888ea20e0. Report an issue: GitHub.

Appendix: source

Thrown at lib/routes/xjtlu/news.ts:60

    },
    stories: {
        en: { name: 'XJTLU Stories', path: 'news/xjtlu-stories' },
        zh: { name: '招生专区', path: 'news_category/topictopic4683' },
    },
};

const handler = async (ctx) => {
    const lang = ctx.req.param('lang') ?? 'en';
    const category = ctx.req.param('category') ?? 'all';

    // Validate language parameter
    if (lang !== 'en' && lang !== 'zh') {
        throw new InvalidParameterError('Invalid language parameter. Use "en" or "zh".');
    }

    // Validate category parameter
    if (!Object.hasOwn(categories, category)) {
        throw new InvalidParameterError(`Invalid category: ${category}. Please refer to the category table in the documentation.`);
    }

    // Build the list URL based on category
    const baseUrl = `https://www.xjtlu.edu.cn/${lang}`;
    const categoryPath = categories[category][lang].path;
    const listUrl = `${baseUrl}/${categoryPath}`;

    // Fetch the news list page
    const response = await ofetch(listUrl);
    const $ = load(response);

    // Extract article cards from the page
    const list = $('.card-group-3 .card.up-down-card, .content .card.up-down-card')
        .toArray()
        .map((item) => {
            const $item = $(item);
            const link = $item.find('.a-links-block').attr('href');
            const title = $item.find('.card-title').text().trim();

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