# Work with BPE Tokens in n8n with the GPT-Tokenizer Node
This community package contains a node to work with BPE Tokens such as OpenAI's GPT models use under the hood. As a matter of fact this node works just fine with the OpenAI Node.
You can:
* Encode a string into BPE Tokens (may be cool for custom training)
* Decode an array of BPE Tokens back to a string (for funzies?)
* Determine a strings token length before submitting to the OpenAI API
* Calculate costs before submitting to OpenAI API
* Split a text into chunks which match exactly a definable Token Limit
[n8n](https://n8n.io/) is a [fair-code licensed](https://docs.n8n.io/reference/license/) workflow automation platform.
[Supported Operations](#supported-operations)
[Installation](#installation)
[Compatibility](#compatibility)
[About](#about)
[Version History](#version-history)
## Supported Operations
| Operation | Description | Options |
| ------------- | ------------- | ------------- |
| Encode | Encode a string into BPE Tokens. Returns an array of Tokens. | - |
| Decode | Decode an array of BPE Tokens into a string. Returns a string. | - |
| Count Tokens | Count the tokens a string produces. Return the number of tokens. | - |
| Check Token Limit | Wheather a given string exceeds a defined Token Limit. Returns a boolean. | Optional: throw an error if the Token Limit is exceeded. |
| Slice to Max Token Limit | Slice the string into block which match exactly the provided token limit. Returns an array of strings. | - |
## Installation
Follow the [installation guide](https://docs.n8n.io/integrations/community-nodes/installation/) in the n8n community nodes documentation.
It also should automatical install this depency: https://www.npmjs.com/package/gpt-tokenizer, which is a port of the original BPE Token Python Library.
## Compatibility
The Latest Version of n8n. If you encounter any problem, feel free to [open an issue](https://github.com/geckse/n8n-nodes-ninox) on Github.
## About
Hi I'm geckse and I let your work flow! 👋
I hope you are enyoing these nodes. If you are in need of a smooth automation, steady integration or custom code check my page: https://let-the-work-flow.com
## Version History
### 0.1.1
- just polising the npm release
### 0.1.0
- initial release