DIYgod/RSSHub · warning · InvalidParameterError

Invalid lang

Error message

Invalid lang

What it means

Thrown as an `InvalidParameterError` when the `lang` path parameter fails `isValidHost()`. The regex `/^[\dA-Z](?:[\dA-Z-]{0,61}[\dA-Z])?$/i` validates hostname-compatible strings. The valid region codes (`na`, `eu`, `fr`, `de`, `jp`) all pass this check, so the error fires only on genuinely malformed input — not on a wrong-but-valid region code. Note: the route does NOT validate that `lang` is one of the five supported regions; it only checks the string is hostname-safe. An unsupported but hostname-valid value like `uk` would pass validation but may produce an empty or broken feed from lodestonenews.com.

Source

Thrown at lib/routes/ff14/ff14-global.ts:42

    handler,
    description: `Region

| North Ameria | Europe | France | Germany | Japan |
| ------------ | ------ | ------ | ------- | ----- |
| na           | eu     | fr     | de      | jp    |

Category

| all | topics | notices | maintenance | updates | status | developers |
| --- | ------ | ------- | ----------- | ------- | ------ | ---------- |`,
};

async function handler(ctx) {
    const lang = ctx.req.param('lang');
    const type = ctx.req.param('type') ?? 'all';

    if (!isValidHost(lang)) {
        throw new InvalidParameterError('Invalid lang');
    }

    const response = await got({
        method: 'get',
        url: `https://lodestonenews.com/news/${type}?locale=${lang}`,
    });

    let data;
    if (type === 'all') {
        data = [];
        for (const arr of Object.values(response.data) as unknown[][]) {
            data = [...data, ...arr];
        }
    } else {
        data = response.data;
    }

    return {

View on GitHub (pinned to bed535e087)

Solutions

1. Use one of the five valid region codes: `na` (North America), `eu` (Europe), `fr` (France), `de` (Germany), `jp` (Japan).
2. Ensure the parameter is a plain alphanumeric string with no special characters.
3. Note: passing an unsupported but valid-looking code (e.g., `uk`) won't throw but may return empty results — always use the documented regions.

const VALID_REGIONS = new Set(['na', 'eu', 'fr', 'de', 'jp']);

function validateLang(lang: string | undefined): string {
    if (!lang || !VALID_REGIONS.has(lang)) {
        throw new InvalidParameterError(`Invalid region: ${lang}. Valid: na, eu, fr, de, jp`);
    }
    return lang;
}

type FF14Region = 'na' | 'eu' | 'fr' | 'de' | 'jp';

function isFF14Region(lang: string): lang is FF14Region {
    return ['na', 'eu', 'fr', 'de', 'jp'].includes(lang);
}

When it happens

Trigger: A user passes a `lang` containing invalid hostname characters — e.g., `en-us` (hyphen is allowed but the regex requires the full string to match), `na.eu`, or a path segment with slashes. The check is purely structural, not semantic.

Common situations: User passes a locale code with dots or underscores. A URL routing issue injects unexpected characters. The user guesses a region code with special characters.

Related errors

• Invalid host
• Invalid user name
• Bad category. See <a href="https://docs.rsshub.app/routes/ne
• Invalid language: ${lang}
• Invalid type: ${type}

AI-assisted analysis of DIYgod/RSSHub@bed535e087 (2026-08-12). Data as JSON: /api/errors/ebda103b022b1b82. Report an issue: GitHub.