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---
#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
title: Block access to nodes
description: "Prevent your n8n users from accessing specific nodes."
contentType: howto
---
# Block access to nodes
For security reasons, you may want to block your users from accessing or working with specific n8n nodes. This is helpful if your users might be untrustworthy.
Use the `NODES_EXCLUDE` environment variable to prevent your users from accessing specific nodes.
## Exclude nodes
Update your `NODES_EXCLUDE` environment variable to include an array of strings containing any nodes you want to block your users from using.
For example, setting the variable this way:
```
NODES_EXCLUDE: "[\"n8n-nodes-base.executeCommand\", \"n8n-nodes-base.readWriteFile\"]"
```
Blocks the [Execute Command](/integrations/builtin/core-nodes/n8n-nodes-base.executecommand/index.md) and [Read/Write Files from Disk](/integrations/builtin/core-nodes/n8n-nodes-base.readwritefile.md) nodes.
Your n8n users won't be able to search for or use these nodes.
## Suggested nodes to block
The nodes that can pose security risks vary based on your use case and user profile. Here are some nodes you might want to start with:
* [Execute Command](/integrations/builtin/core-nodes/n8n-nodes-base.executecommand/index.md)
* [Read/Write Files from Disk](/integrations/builtin/core-nodes/n8n-nodes-base.readwritefile.md)
## Related resources
Refer to [Nodes environment variables](/hosting/configuration/environment-variables/nodes.md) for more information on this environment variable.
Refer to [Configuration](/hosting/configuration/configuration-methods.md) for more information on setting environment variables.
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