(node:6572) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. (Use node --trace-deprecation ... to show where the warning was created)

[shriekdj]

Summary

I am getting this issue for running nextjs under iis.

most of the time the nextjs app works fine there with nextjs's custom server with expressjs under iis.

this issue only happenes on live production server.

(node:6572) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

Additional information

App Deployed on : IIS
NextJS Version : 13.5.4
Using App Router : true
Using Custom Server : true
Custom Server Program : express.js boilerplate.
Occurrence of error : undefined

issue only happened on live server, suddenly, mostly occures once a day and we had to restart the server and issue solves but we just can't live with it like that.

Example

No response

[icyJoseph]

What's your Node version?

[shriekdj]

i am using lts version v20.9.0

[mutasim77]

Update both nodejs and npm to the latest versions. After that go to your project and delete the node_modules folder and re-install it by npm install

[shriekdj]

i already tried that, but this issue only occures on production server

[Saprou]

same here, did you fix it?

[shriekdj]

@Saprou my issue solved when i updated my tsconfig file to use ES2015 and above.
I Am Now using ES2020

[vstar001]

hi can you tell me that
answer iam using javascript

[shrekuu]

I have the same issue. It's not related to Next.js. I guess you are using web3.js 1.x. It's from this package. You can just ignore it, or be brave and upgrade to the latest web3.js v4. It might take a lot of refactoring work.
https://stackoverflow.com/questions/52165333/deprecationwarning-buffer-is-deprecated-due-to-security-and-usability-issues

[shriekdj]

@shrekuu my issue solved when i updated my tsconfig file to use ES2015 and above.
I Am Now using ES2020

[UTSProjects]

But i am not using typescript , so i dont have a tsconfig file , what should i do ?
(node:10116) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
(Use node --trace-deprecation ... to show where the warning was created)

[shriekdj]

if you are not using typescript, then you can use babel.config.js instead for your javascript program and set it's target to ES2015 and above. everything else is same. you will not gonna need to change your project to typescript.

[UTSProjects]

For some reason that was not the issue that was causing it ,IG there was some issue with ports : I was using standalone feature of nextjs and in there my entrypoint is server.js file which had
const currentPort = parseInt(process.env.PORT || 3000) I changed it to
const currentPort = process.env.PORT || 3000 and it worked for me.

[shriekdj]

@UTSProjects cool. your issue solved that is what important, then whatever method 👍 .