ST-2026-073 · API endpoints & versions
Cloudflare account creation API will reject names over 65 characters
Cloudflare will align account-creation validation by returning HTTP 400 when POST /accounts receives a name longer than 65 characters.
Previous state
PUT /accounts/{account_id} enforced a 65-character account-name limit while POST /accounts silently truncated longer names up to 120 bytes.
Current state
POST /accounts will reject account names longer than 65 characters with HTTP 400 instead of silently truncating them.
Affected users
Who needs to care
Integrations that create Cloudflare accounts and submit account names longer than 65 characters.
Required response
What to do
Validate and shorten account names before calling POST /accounts, and handle the HTTP 400 response.
Evidence boundary
What the source does not prove
The notice does not state that existing account names will be renamed, rejected or retroactively truncated.
Lifecycle history
Dated event sequence
- Enforcement announced
Cloudflare documented the 65-character validation change for account creation.
- Enforcement begins
POST /accounts starts rejecting longer names with HTTP 400.
Evidence ledger
First-party sources
- 01Cloudflare Developers — Cloudflare API deprecations
Official API deprecation documentation · 2026-07-22
Open official source ↗