DIYgod/RSSHub · error · InvalidParameterError

Category not found

Error message

Category not found

What it means

Thrown by the M-78 news handler (lib/routes/m-78/news.ts:92) as an `InvalidParameterError` when the WordPress REST API at `/wp-json/wp/v2/categories?slug=<category>` returns an empty array — i.e. no WordPress category matches the supplied slug.

Source

Thrown at lib/routes/m-78/news.ts:92

    },
    handler,
    maintainers: ['KarasuShin'],
    features: {
        supportRadar: true,
    },
    view: ViewType.Articles,
};

async function handler(ctx: Context): Promise<Data> {
    const rootUrl = 'https://m-78.jp';
    const cateAPIUrl = `${rootUrl}/wp-json/wp/v2/categories`;
    const postsAPIUrl = `${rootUrl}/wp-json/wp/v2/posts`;
    const category = ctx.req.param('category') ?? 'news';
    const limit = ctx.req.query('limit') ? Number(ctx.req.query('limit')!) : 20;

    const categories = await ofetch(`${cateAPIUrl}?slug=${category}`);
    if (categories.length === 0) {
        throw new InvalidParameterError('Category not found');
    }

    const { id: categoryId, link: categoryLink, name: categoryName } = categories[0];

    const posts = await ofetch<Post[]>(`${postsAPIUrl}?categories=${categoryId}&per_page=${limit}`);
    return {
        title: `${categoryName} | ニュース`,
        link: categoryLink,
        item: posts.map((post) => {
            const $ = load(post.content.rendered, null, false);
            $('#ez-toc-container').remove();
            $('img').each((_, img) => {
                if (/wp-content\/uploads/.test(img.attribs.src)) {
                    img.attribs.src = img.attribs.src.replace(/(-\d+x\d+)/, '');
                }
            });
            return {
                title: post.title.rendered,

View on GitHub (pinned to bed535e087)

Solutions

1. Use a valid category slug — confirm via `https://m-78.jp/wp-json/wp/v2/categories`.
2. Default to `news` if you want the site's main news category.
3. Ensure the slug is lowercase and hyphenated as WordPress stores it.

Example fix

// before: GET /m-78/news/updates
// after:  GET /m-78/news  (or a slug confirmed against /wp-json/wp/v2/categories)

async function categoryExists(slug: string): Promise<boolean> {
    const cats = await ofetch(`https://m-78.jp/wp-json/wp/v2/categories?slug=${encodeURIComponent(slug)}`);
    return Array.isArray(cats) && cats.length > 0;
}
if (!await categoryExists(slug)) throw new TypeError(`Unknown M-78 category '${slug}'`);

function isWpCategoryArray(v: unknown): v is { id: number; slug: string; link: string; name: string }[] {
    return Array.isArray(v) && v.length > 0 && typeof v[0]?.id === 'number';
}

import { InvalidParameterError } from '@/errors/types/invalid-parameter';
try {
    await fetchM78News(category);
} catch (e) {
    if (e instanceof InvalidParameterError && /Category not found/.test(e.message)) {
        return { error: `No WordPress category '${category}' on m-78.jp` };
    }
    throw e;
}

When it happens

Trigger: Requesting `/m-78/news/<slug>` with a slug that is not a WordPress category on m-78.jp; typo; the category was renamed/removed; uppercase slug (WordPress slugs are lowercase).

Common situations: Guessing category names; copying a URL segment that is a tag or page rather than a category; stale slug from an old site structure.

Related errors

• Invalid category: ${categoryParam}. Valid categories are: ${
• Invalid category: ${category}
• Invalid region
• Invalid Locals content route option. Supported filters are `
• Invalid name

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/011981220c8e7a35. Report an issue: GitHub.