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Developer launches free public API to convert and check Claude session cookies

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A developer has built claudecookie.com, a tool designed to bridge the gap between Claude's browser-based session cookies and the credentials file required by Claude Code. The platform offers three core functions: converting cookies between formats, checking whether a session is active along with its plan and usage limits, and downloading a ready-to-use credentials file. All three features are also available as a keyless, CORS-open public JSON API accessible over HTTPS, with rate limits applied per IP to prevent abuse. Batch session checks support up to 10 cookies per request, and an OpenAPI 3.1 spec plus example scripts are publicly available on GitHub. The project is not affiliated with or endorsed by Anthropic, and users are advised to treat session cookies with the same care as passwords.

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Developer launches free public API to convert and check Claude session cookies · ShortSingh