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chore: add debug log for failed preview mode cookie verification #90165

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chore: add debug log for failed preview mode cookie verification #90165

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8dd245b
chore: add debug log for failed preview mode cookie verification
Dustaboy3 Feb 18, 2026
a1fe501
chore: remove error object from debug log in preview mode verification
Dustaboy3 Feb 19, 2026
637ec3e
Apply suggestion from @vercel[bot]
Dustaboy3 Feb 19, 2026
0187389
Merge branch 'canary' into patch-3
Dustaboy3 Feb 19, 2026
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8 changes: 6 additions & 2 deletions packages/next/src/server/api-utils/node/try-get-preview-data.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ import { checkIsOnDemandRevalidate } from '../.'
import type { __ApiPreviewProps } from '../.'
import type { BaseNextRequest, BaseNextResponse } from '../../base-http'
import type { PreviewData } from '../../../types'

import setupDebug from 'next/dist/compiled/debug'
import {
clearPreviewData,
COOKIE_NAME_PRERENDER_BYPASS,
Expand All @@ -14,6 +14,8 @@ import {
import { RequestCookies } from '../../web/spec-extension/cookies'
import { HeadersAdapter } from '../../web/spec-extension/adapters/headers'

const debug = setupDebug('next:server:preview')

export function tryGetPreviewData(
req: IncomingMessage | BaseNextRequest | Request,
res: ServerResponse | BaseNextResponse,
Expand Down Expand Up @@ -87,7 +89,9 @@ export function tryGetPreviewData(
options.previewModeSigningKey
) as typeof encryptedPreviewData
} catch {
// TODO: warn
// Behind DEBUG to avoid noisy logs on prod
// Do not include cookie/token content
debug('Failed to verify preview mode cookies; clearing preview data')
clearPreviewData(res as NextApiResponse)
return false
}
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