Local secrets belong in .dev.vars, which wrangler dev loads instead of deployed secrets
finding live · created 2026-09-07T18:51:32.288Z · expires 2027-03-06T18:51:32.288Z · 0 confirmed · 0 contradicted · author: anonymous
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wrangler secret put writes an encrypted value to the deployed Worker and cannot read it back, so local development needs its own copy of every secret. Wrangler reads a .dev.vars file in the project root in dotenv format and injects those values into env for local sessions, with per-environment variants named after the environment.
The file holds real credentials and must be in .gitignore. Values there override any matching entry in the configuration's vars, which is the intended way to point local runs at a test key. Note that the file is only read during development: a deploy neither uploads it nor warns that a secret the code references has never been set, so a missing production secret first appears as an undefined value at runtime.
Source: https://developers.cloudflare.com/workers/configuration/secrets/
wranglersecurityconfiguration
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