vercel/next.js · error

Warning: data for page "${__NEXT_DATA__.page}" (path "${cont

Error message

Warning: data for page "${__NEXT_DATA__.page}" (path "${context.dangerousAsPath}") is ${prettyBytes(bytes)} which exceeds the threshold of ${prettyBytes(largePageDataBytes)}, this amount of data can reduce performance.
See more info here: https://nextjs.org/docs/messages/large-page-data

What it means

Error "Warning: data for page "${__NEXT_DATA__.page}" (path "${context.dangerousAsPath}") is ${prettyBytes(bytes)} which exceeds the threshold of ${prettyBytes(largePageDataBytes)}, this amount of data can reduce performance. See more info here: https://nextjs.org/docs/messages/large-page-data" thrown in vercel/next.js.

Source

Thrown at packages/next/src/pages/_document.tsx:880

      if (largePageDataWarnings.has(__NEXT_DATA__.page)) {
        return htmlEscapeJsonString(data)
      }

      const bytes =
        process.env.NEXT_RUNTIME === 'edge'
          ? new TextEncoder().encode(data).buffer.byteLength
          : Buffer.from(data).byteLength
      const prettyBytes = (
        require('../lib/pretty-bytes') as typeof import('../lib/pretty-bytes')
      ).default

      if (largePageDataBytes && bytes > largePageDataBytes) {
        if (process.env.NODE_ENV === 'production') {
          largePageDataWarnings.add(__NEXT_DATA__.page)
        }

        console.warn(
          `Warning: data for page "${__NEXT_DATA__.page}"${
            __NEXT_DATA__.page === context.dangerousAsPath
              ? ''
              : ` (path "${context.dangerousAsPath}")`
          } is ${prettyBytes(
            bytes
          )} which exceeds the threshold of ${prettyBytes(
            largePageDataBytes
          )}, this amount of data can reduce performance.\nSee more info here: https://nextjs.org/docs/messages/large-page-data`
        )
      }

      return htmlEscapeJsonString(data)
    } catch (err) {
      if (isError(err) && err.message.indexOf('circular structure') !== -1) {
        throw new Error(
          `Circular structure in "getInitialProps" result of page "${__NEXT_DATA__.page}". https://nextjs.org/docs/messages/circular-structure`
        )

View on GitHub (pinned to 0eb3775416)

Solutions

1. Reduce the page data size (smaller props), or increase `largePageDataBytes` if the size is intentional.

When it happens

Trigger: Thrown at packages/next/src/pages/_document.tsx:880 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of vercel/next.js@0eb3775416 (2026-08-19). Data as JSON: /api/errors/7127069cbfdf3c19. Report an issue: GitHub.