Userstack
Secure User-Agent String Lookup JSON API
- Authentication
- OAuth
- HTTPS
- Yes
- CORS
- Unknown
- Category
- Development
Overview
Userstack parses user-agent strings — key-based (an invalid key returns HTTP 200 with success:false, verified).
Quick Start
Detect (replace YOUR_KEY):
curl "https://api.userstack.com/api/detect?access_key=YOUR_KEY&ua=test"{ "success": false, "error": { "code": 101, "type": "invalid_access_key", "info": "You have not supplied a valid API Access Key." } }Authentication
- Register at userstack.com → API key.
- Send it as the
access_keyquery parameter.
⚠️ Gotcha (verified): invalid keys return HTTP 200 with
success:false— check thesuccessfield.
Rate Limits & Notes
- Free tier: 1,000 requests/month (check the docs); paid plans scale.
- UA parsing.
FAQ
Is Userstack free? Free tier: 1,000 requests/month; more is paid.
Why 200 with success:false?
Errors come as 200 + success:false (verified) — check success.
What’s the auth style?
access_key query parameter.
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