# How to install an OPC UA Node
**URL:** https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824
**Category:** General
**Created:** [14 April 2020 15:51 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824 "2020-04-14T15:51:26Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Tasty1](https://discourse.nodered.org/u/Tasty1)
#### Post date: [14 April 2020 15:51 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/1 "2020-04-14T15:51:26Z")
Hi I am new and I've Trouble with the Installation of the OPC UA node on my Laptop (Windows 10)
I recieve this message:
C:\Users\*\*\*\*\>npm install node-red-contrib-opcua
npm ERR! Unexpected end of JSON input while parsing near '...0.0.17","node-opcua-s'
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\*\*\*\*\AppData\Roaming\npm-cache\_logs\2020-04-14T15\_48\_56\_711Z-debug.log
can somebody help me with this Problem?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [14 April 2020 21:38 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/2 "2020-04-14T21:38:29Z")
Does that still happen if you try again (it might have been a network problem).
Otherwise all I can think of is that the npm cache is corrupted, though that is very unusual. If trying again fails the same way then run
`npm cache clean --force`
and try again.
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### Author:  [@Tasty1](https://discourse.nodered.org/u/Tasty1)
#### Post date: [15 April 2020 06:51 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/3 "2020-04-15T06:51:01Z")
> [@Colin](#):
>
> npm cache clean --force
Thank you very much!
now I have installed it!!
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [15 April 2020 07:21 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/4 "2020-04-15T07:21:37Z")
What version of npm have you got? According to [https://docs.npmjs.com/cli/cache](https://docs.npmjs.com/cli/cache) it is supposed to be not possible to get corrupted data in the cache. To find out run
`npm -v`
also of interest might be
`node -v`
---
### Author:  [@Tasty1](https://discourse.nodered.org/u/Tasty1)
#### Post date: [16 April 2020 18:18 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/5 "2020-04-16T18:18:07Z")
My npm version is: 6.14.4
and my Node Version is: v12.16.2
What would you recomand me?
Thanks
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### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [16 April 2020 19:54 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/6 "2020-04-16T19:54:01Z")
They are currently the best choices (imho).
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [30 April 2020 20:07 UTC](https://discourse.nodered.org/t/how-to-install-an-opc-ua-node/24824/7 "2020-04-30T20:07:04Z")
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