Glassdoor Data Extraction
Extract publicly available data from Glassdoor at scale using AlterLab's API — JavaScript rendering, structured extraction, and automatic retries in one request.
Website Compatibility Notes
Glassdoor uses strict bot protections with rate limiting and full challenge pages. User account login gates some review content after a certain number of views. Full browser rendering with challenge resolution is necessary for reliable access to review data. The login wall triggers after viewing a limited number of reviews without an account — AlterLab manages the challenge portion but cannot authenticate user accounts.
Technical Context
Glassdoor company pages are at glassdoor.com/Overview/Working-at-{company-name}-EI_{company-id}.htm. Review pages use a similar pattern. Glassdoor's login wall is a soft gate — a certain number of reviews are visible before a login prompt appears. Salary pages are at glassdoor.com/Salary/{company-name}-Salaries-EI_{company-id}.htm. The company ID in URLs is a stable identifier for systematic collection.
Common Data Fields
Typical fields available when extracting data from Glassdoor:
Responsible Use
AlterLab is designed for extracting publicly available data. Always review the terms of service for any website you access, respect robots.txt directives, and ensure your use case complies with applicable laws in your jurisdiction. Do not use this service to access non-public, authenticated, or personally identifiable data without appropriate authorization.
Quick Start — Extract from Glassdoor
# Always verify the target site's robots.txt and terms of service before extracting data.
curl -X POST https://alterlab.io/api/v1/scrape \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"url": "https://www.glassdoor.com/Reviews/company-reviews.htm",
"advanced": { "render_js": true }
}'Need an API key? — no credit card required.
Python Example
import requests
# Always verify the target site's robots.txt and terms of service before extracting data.
response = requests.post(
"https://alterlab.io/api/v1/scrape",
headers={
"X-API-Key": "YOUR_API_KEY",
"Content-Type": "application/json",
},
json={
"url": "https://www.glassdoor.com/Reviews/company-reviews.htm",
"advanced": {"render_js": True},
},
)
data = response.json()
print(data["content"][:500]) # First 500 chars of extracted contentFrequently Asked Questions
How do I extract Glassdoor company reviews?
Send Glassdoor company review page URLs to AlterLab with JavaScript rendering. The service returns overall ratings, review counts, pros/cons summaries, and CEO approval ratings from public pages.
Can I extract Glassdoor salary data?
AlterLab can render publicly visible Glassdoor salary pages to extract reported salary ranges, base pay estimates, and compensation breakdowns by role and location.
Does AlterLab work with Glassdoor job listings?
Yes. Glassdoor job listing pages can be rendered to extract job titles, company info, salary estimates, location, and job descriptions from publicly accessible listings.
How many Glassdoor reviews can I access without logging in?
Glassdoor shows a limited number of reviews before prompting for login. AlterLab extracts all publicly visible reviews up to this limit. For company overview pages, the aggregate ratings and scores are fully accessible without authentication.
What is Glassdoor's company ID and where do I find it?
Glassdoor's company ID appears in the URL as EI_{number} (e.g., EI_IE1138.11). This ID is a stable identifier for each company across all Glassdoor URLs (reviews, salaries, jobs) — useful for constructing direct links to specific company data.
Can I compare multiple companies' Glassdoor ratings?
Yes. Collect rating data from multiple company overview pages and compare dimensions like overall rating, work-life balance, compensation, and CEO approval percentage. This gives a quantitative basis for competitive employer benchmarking.
Related Use Cases
Business Data Guide
Developer Scraping Resources
How to Scrape Glassdoor Data: Complete Guide
Step-by-step tutorial with Python and Node.js code examples, structured extraction, and cost breakdown for Glassdoor scraping.
How to Handle Bot Protection Challenges
All 6 detection layers explained: TLS fingerprinting, JS challenges, Turnstile, and more.
JavaScript Rendering API
Full browser rendering for SPAs, React, and dynamic content.
Python Web Scraping API
pip install alterlab — async-ready Python SDK with 5,000 free scrapes.
Pricing
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