### Install Anthropic Tokenizer

Source: https://github.com/anthropics/anthropic-tokenizer-typescript/blob/main/README.md

Installs the Anthropic tokenizer package using either npm or yarn. This is the first step to using the tokenizer in your project.

```sh
npm install --save @anthropic-ai/tokenizer
# or
yarn add @anthropic-ai/tokenizer
```

--------------------------------

### Count Tokens with Anthropic Tokenizer (JavaScript)

Source: https://github.com/anthropics/anthropic-tokenizer-typescript/blob/main/README.md

Demonstrates how to use the `countTokens` function from the `@anthropic-ai/tokenizer` package to count tokens in a given text string. This example logs the text and its corresponding token count to the console.

```javascript
import { countTokens } from '@anthropic-ai/tokenizer';

function main() {
  const text = 'hello world!';
  const tokens = countTokens(text);
  console.log(`'${text}' is ${tokens} tokens`);
}
main();
```

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