Pricing

$4.99/month + usage

Html Lang Validator

HTML lang validator that checks any webpage for missing or invalid lang attributes, so developers and SEO teams can fix language tag errors across large sites without clicking through pages one by one.

Pricing

$4.99/month + usage

Rating

0.0

(0)

Developer

ZeroBreak

Actor stats

Bookmarked

Total users

Monthly active users

19 hours ago

Last modified

HTML Lang Validator: Check and Fix Missing Lang Attributes on Any Website

HTML lang validator checks every URL you give it for a missing or invalid lang attribute on the <html> tag. The lang attribute tells browsers and screen readers what language a page is written in. Leave it out and you create an ambiguity that costs you in accessibility audits and search rankings. Most site audits catch broken links and slow pages but skip the lang check entirely.

Point the actor at one URL or feed it a list of hundreds. It fetches each page, reads the lang attribute, and validates the value against BCP 47 rules. Results land in a dataset with the exact lang value found, HTTP status, page title, and a plain list of any issues detected.

Use cases

SEO auditing: find pages with missing lang attributes before they hurt international SEO performance
Accessibility compliance: flag lang attribute errors that break screen reader language detection
Site migrations: validate lang attributes across every page after a CMS or template change
Multilingual site QA: confirm each language variant has the correct lang value set
Bulk content audits: check hundreds of URLs without opening each page by hand

Input

Parameter	Type	Default	Description
`url`	string	-	Single URL to validate
`urls`	array	-	List of URLs to validate, one per line
`maxUrls`	integer	100	Maximum URLs to process per run (max: 1000)
`requestTimeoutSecs`	integer	30	Per-request timeout in seconds
`proxyConfiguration`	object	Datacenter (Anywhere)	Proxy type and location for requests. Supports Datacenter, Residential, Special, and custom proxies. Optional.

Example input

{
    "urls": [
        "https://apify.com",
        "https://apify.com/store",
        "https://apify.com/about"
    ],
    "maxUrls": 100,
    "requestTimeoutSecs": 30,
    "proxyConfiguration": { "useApifyProxy": true }
}

What data does this actor collect?

Each result in the dataset contains:

{
    "url": "https://apify.com",
    "httpStatus": 200,
    "pageTitle": "Apify: Full-stack web scraping and data extraction platform",
    "langValue": "en",
    "xmlLangValue": null,
    "isLangPresent": true,
    "isLangValid": true,
    "issues": [],
    "hasIssues": false,
    "error": null,
    "checkedAt": "2025-03-04T10:23:41.123456+00:00"
}

Field	Type	Description
`url`	string	Final URL after any redirects
`httpStatus`	integer	HTTP response status code
`pageTitle`	string	Page title from the `<title>` tag
`langValue`	string	Value of the `lang` attribute. Null if missing.
`xmlLangValue`	string	Value of `xml:lang` (used in XHTML documents). Null if not present.
`isLangPresent`	boolean	True if a `lang` attribute exists on the `<html>` tag
`isLangValid`	boolean	True if the `lang` value passes BCP 47 validation
`issues`	array	List of validation issues found for this URL
`hasIssues`	boolean	True if any issues were detected
`error`	string	Error message if the page could not be fetched. Null otherwise.
`checkedAt`	string	ISO 8601 timestamp of when the check ran

How it works

Collects URLs from url and urls inputs, deduplicates them, and caps at maxUrls
Fetches each page with an async HTTP client using a realistic browser user-agent
Parses the HTML with BeautifulSoup and reads the lang attribute from the <html> tag
Validates the value against BCP 47 language tag rules
Flags issues: missing attribute, empty value, or invalid format
Pushes results to the dataset in real time as each URL finishes

Integrations

Connect HTML Lang Validator with other apps using Apify integrations. You can pipe results into Google Sheets, trigger Slack alerts via Make or Zapier, or connect to Airbyte for data warehouse ingestion. Use webhooks to trigger downstream actions as soon as a run completes.

FAQ

What counts as a valid lang attribute? The actor validates against BCP 47 language tags. Values like en, en-US, fr, zh-Hant, and pt-BR all pass. Values like english, EN_US, or an empty string fail.

What happens if a page returns a 404 or 5xx error? The actor records the HTTP status and writes an error message to the result. It keeps processing the rest of the list rather than stopping.

Can it handle XHTML pages that use xml:lang instead of lang? Yes. The actor reads both lang and xml:lang. If only xml:lang is found, it flags the missing lang attribute and notes the xml:lang value in the result.

How many URLs can it process in one run? Up to 1,000 per run. Use maxUrls to keep runs smaller during testing.

Does it follow redirects? Yes. The actor follows HTTP redirects automatically and reports the final URL after all hops.

Can I run this on a schedule? Yes. Set up a scheduled run in Apify Console to monitor your site's lang attribute compliance over time and catch regressions after deployments.

Run the HTML lang validator on your site and get a full report on missing or invalid lang attributes. Export results as JSON or CSV, or push them directly to Google Sheets for review.

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