DIYgod/RSSHub · warning · InvalidParameterError

Invalid language: ${lang}

Error message

Invalid language: ${lang}

What it means

Thrown as an `InvalidParameterError` when the `lang` path parameter is not in the allowed set `{'zh-hant', 'en'}`. RSSHub's InvalidParameterError produces an HTTP 400-level response so the user knows the input is wrong, not the server. This is pre-flight validation before any network call.

Source

Thrown at lib/routes/ea/apex-news.ts:26

import { parseDate } from '@/utils/parse-date';

const md = MarkdownIt({
    html: true,
    breaks: true,
});

const langEnum = new Set(['zh-hant', 'en']);
const typeEnum = new Set(['latest', 'game-updates', 'news-article']);

async function handler(ctx) {
    const { lang = 'en', type = 'latest' } = ctx.req.param();
    const apiParams = new URLSearchParams({
        limit: '13',
        gameSlug: 'apex-legends',
        offset: '0',
    });
    if (!langEnum.has(lang)) {
        throw new InvalidParameterError(`Invalid language: ${lang}`);
    }
    if (!typeEnum.has(type)) {
        throw new InvalidParameterError(`Invalid type: ${type}`);
    }
    if (type !== 'latest') {
        apiParams.append('typeSlug', type);
    }
    if (lang !== 'en') {
        apiParams.append('locale', lang);
    }
    const apiUrl = `https://drop-api.ea.com/news-articles/pagination?${apiParams}`;
    const newsItems = await ofetch(apiUrl);

    type NewsItem = DataItem & {
        slug: string;
    };
    const allItems: NewsItem[] = [newsItems.featured, ...newsItems.items].filter(Boolean).map((item) => ({
        title: item.title,

View on GitHub (pinned to bed535e087)

Solutions

1. Use one of the two supported values: `en` (English) or `zh-hant` (Traditional Chinese).
2. Omit the lang parameter entirely to default to `en`.
3. Check the route definition's `parameters.lang.options` for the authoritative list of valid values.

// Validate lang before the handler logic
const SUPPORTED_LANGS = new Set(['zh-hant', 'en']);
function validateLang(lang: string | undefined): string {
    const resolved = lang ?? 'en';
    if (!SUPPORTED_LANGS.has(resolved)) {
        throw new InvalidParameterError(`Invalid language: ${lang}. Supported: en, zh-hant`);
    }
    return resolved;
}

function isSupportedLang(lang: string): lang is 'en' | 'zh-hant' {
    return lang === 'en' || lang === 'zh-hant';
}

When it happens

Trigger: A user requests `/ea/apex-news/<lang>/...` where `<lang>` is something other than `zh-hant` or `en` — for example `zh`, `zh-cn`, `ja`, or a typo like `enf`. The langEnum Set check fails immediately.

Common situations: User guesses a language code (e.g., `zh` instead of `zh-hant`, or `cn` instead of `en`). Documentation or third-party feed readers pass an unsupported locale. A URL encoding issue mangles the parameter.

Related errors

• Invalid type: ${type}
• No category '${category}'.
• Bad category. See <a href="https://docs.rsshub.app/routes/ne
• Invalid host
• Invalid user name

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/68fb2e6b8f8ae213. Report an issue: GitHub.