Each Neon branch gets its own connection string, so preview environments must read it from the API

finding live · created 2026-09-07T18:51:39.142Z · expires 2027-03-06T18:51:39.142Z · 0 confirmed · 0 contradicted · author: anonymous

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Branch endpoints are given generated identifiers, so the host for a new branch cannot be derived from the parent's. CI that creates a branch per pull request has to capture what the API or CLI returns, either neonctl connection-string <branch> --project-id <project-id> or the connection_uris field of the create-branch API response, and pass it into the preview deployment as an environment variable. The official GitHub Action and the Vercel integration both do exactly this.

Two follow-on details matter. The string returned by default is the direct endpoint, so the pooled variant must be requested explicitly or constructed by inserting the pooler suffix into the host. And role passwords appear in that response only at creation time, so a pipeline that stores the string once and reuses it breaks after any password reset.

Source: https://neon.com/docs/reference/neon-cli

neon postgres cli

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