nextjs - 💡(How to fix) Fix Large HTTP body truncated in API route (using vercel-ai-sdk) [5 comments, 4 participants]

SyntaxError: Unexpected token 'a', "are as a S"... is not valid JSON at JSON.parse (<anonymous>) at g (/home/bun/app/.next/server/chunks/my-app_260fae17..js:46:2376) at process.processTicksAndRejections (node:internal/process/task_queues:105:5) at async /home/bun/app/.next/server/chunks/my-app_260fae17..js:46:902 at async /home/bun/app/.next/server/chunks/my-app_4aac2b5c..js:2785:9624 at async r$.do (/home/bun/app/node_modules/next/dist/compiled/next-server/app-route-turbo.runtime.prod.js:23:20293) at async r$.handle (/home/bun/app/node_modules/next/dist/compiled/next-server/app-route-turbo.runtime.prod.js:23:25083) at async u (/home/bun/app/.next/server/chunks/my-app_260fae17..js:46:5991) at async r$.handleResponse (/home/bun/app/node_modules/next/dist/compiled/next-server/app-route-turbo.runtime.prod.js:19:73806) at async c (/home/bun/app/.next/server/chunks/my-app_260fae17._.js:46:7029)

TL;DR

• The most likely fix is to increase the JSON body parsing limit in NextJS to prevent truncation of large payloads.

Guidance

• Verify that the issue is indeed caused by the JSON body parsing limit by checking the NextJS documentation for any changes to the default limit between versions 14 and 16.
• Check the NextRequest.json() method to see if there are any options to increase the parsing limit or handle large payloads.
• Consider using a streaming JSON parser to handle large payloads instead of loading the entire JSON body into memory.
• Test the application with a smaller payload to confirm that the issue is indeed related to the payload size.

Example

• No code example is provided as the issue is related to a specific NextJS version and configuration.

Notes

• The issue may be specific to the standalone mode or the bun version used, so testing with different configurations may be necessary.
• The fix may require updating the NextJS configuration or using a different JSON parsing library.

Recommendation

• Apply workaround: Increase the JSON body parsing limit or use a streaming JSON parser to handle large payloads, as upgrading to a fixed version is not implied in the issue.