Segment Analytics.js Not Loading
Quick answer
If typing analytics in the console returns undefined, the snippet is broken, blocked or cached incorrectly.
Most likely fix: Check the snippet
How to fix it
Try these in order — the most common fix is first.
1. Check the snippet
- Re-copy it from Source > Settings > API Keys
- Confirm only one snippet exists
Did this fix it?2. Clear caches
- Hard reload
- Purge CDN cache for the Segment script
Did this fix it?3. Fix third-party conflicts
- Preserve the original Array.from if Prototype.js is used
Did this fix it?4. Use a domain you control
- Avoid *.github.io or *.herokuapp.com for cookies
Did this fix it?
Symptoms
analytics is undefined, or ChunkLoadError in the console.
Why it happens
- Typo or missing characters in the snippet
- Stale cache or ChunkLoadError
- Cloudflare caching the Segment JS file
- Prototype.js overriding Array.from
- Site on a Public Suffix List domain
This guide also covers
- analytics.js not loading
- segment snippet undefined
- segment ChunkLoadError
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