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claude-token-counter.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Token Counter</title>
<style>
* {
box-sizing: border-box;
}
body {
font-family: Helvetica, Arial, sans-serif;
line-height: 1.6;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
textarea {
width: 100%;
min-height: 200px;
margin: 10px 0;
padding: 10px;
font-size: 16px;
font-family: monospace;
border: 1px solid #ccc;
border-radius: 4px;
}
button {
background: #0066ff;
color: white;
border: none;
padding: 10px 20px;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
}
button:disabled {
background: #cccccc;
cursor: not-allowed;
}
.output {
background: #f5f5f5;
padding: 20px;
border-radius: 4px;
margin-top: 20px;
white-space: pre-wrap;
font-family: monospace;
}
.error {
color: #ff0000;
margin: 10px 0;
}
.input-group {
margin-bottom: 20px;
}
label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.file-drop-area {
border: 2px dashed #ccc;
border-radius: 4px;
padding: 20px;
text-align: center;
margin: 20px 0;
background: #f8fafc;
cursor: pointer;
}
.file-drop-area.drag-over {
background: #e2e8f0;
border-color: #0066ff;
}
.file-list {
margin: 10px 0;
}
.file-item {
display: flex;
align-items: center;
justify-content: space-between;
padding: 8px;
background: #f5f5f5;
border-radius: 4px;
margin: 4px 0;
}
.file-item button {
background: #ff3333;
padding: 4px 8px;
font-size: 14px;
}
.file-item button:hover {
background: #cc0000;
}
</style>
</head>
<body>
<h1>Claude Token Counter</h1>
<div class="input-group">
<label for="system">System prompt:</label>
<textarea id="system" style="min-height: 100px" placeholder="Enter system prompt (optional)"></textarea>
</div>
<div class="input-group">
<label for="content">User message:</label>
<textarea id="content" placeholder="Enter message content"></textarea>
</div>
<div class="file-drop-area" id="dropArea">
<p>Drag and drop files here or click to select</p>
<input type="file" id="fileInput" multiple style="display: none">
<div class="file-list" id="fileList"></div>
</div>
<button id="count">Count Tokens</button>
<div id="error" class="error"></div>
<div id="output" class="output"></div>
<script type="module">
const API_URL = 'https://api.anthropic.com/v1/messages/count_tokens'
const MODEL = 'claude-3-5-sonnet-20241022'
let attachedFiles = []
function getApiKey() {
let key = localStorage.getItem('ANTHROPIC_API_KEY')
if (!key) {
key = prompt('Please enter your Anthropic API key:')
if (key) {
localStorage.setItem('ANTHROPIC_API_KEY', key)
}
}
return key
}
function handleFiles(files) {
for (const file of files) {
if (file.type.startsWith('image/') || file.type === 'application/pdf') {
readAndStoreFile(file)
} else {
errorDiv.textContent = `Unsupported file type: ${file.type}`
}
}
}
function readAndStoreFile(file) {
const reader = new FileReader()
reader.onload = function(e) {
const base64Data = e.target.result.split(',')[1]
attachedFiles.push({
name: file.name,
type: file.type,
data: base64Data
})
updateFileList()
}
reader.readAsDataURL(file)
}
function updateFileList() {
const fileList = document.getElementById('fileList')
fileList.innerHTML = attachedFiles.map((file, index) => `
<div class="file-item">
<span>${file.name} (${file.type})</span>
<button onclick="removeFile(${index})">Remove</button>
</div>
`).join('')
}
window.removeFile = function(index) {
attachedFiles.splice(index, 1)
updateFileList()
}
async function countTokens(system, content) {
const apiKey = getApiKey()
if (!apiKey) {
throw new Error('API key is required')
}
const messageContent = []
// Add files first
for (const file of attachedFiles) {
messageContent.push({
type: file.type.startsWith('image/') ? 'image' : 'document',
source: {
type: 'base64',
media_type: file.type,
data: file.data
}
})
}
// Add text content if present
if (content.trim()) {
messageContent.push({
type: 'text',
text: content
})
}
const messages = [{
role: 'user',
content: messageContent
}]
const response = await fetch(API_URL, {
method: 'POST',
headers: {
'x-api-key': apiKey,
'content-type': 'application/json',
'anthropic-version': '2023-06-01',
'anthropic-beta': 'token-counting-2024-11-01,pdfs-2024-09-25',
'anthropic-dangerous-direct-browser-access': 'true'
},
body: JSON.stringify({
model: MODEL,
system: system || undefined,
messages
})
})
if (!response.ok) {
const error = await response.text()
throw new Error(`API error: ${error}`)
}
return response.json()
}
const systemInput = document.getElementById('system')
const contentInput = document.getElementById('content')
const countButton = document.getElementById('count')
const errorDiv = document.getElementById('error')
const outputDiv = document.getElementById('output')
const dropArea = document.getElementById('dropArea')
const fileInput = document.getElementById('fileInput')
// File upload handling
dropArea.addEventListener('click', () => fileInput.click())
fileInput.addEventListener('change', (e) => handleFiles(e.target.files))
dropArea.addEventListener('dragover', (e) => {
e.preventDefault()
dropArea.classList.add('drag-over')
})
dropArea.addEventListener('dragleave', () => {
dropArea.classList.remove('drag-over')
})
dropArea.addEventListener('drop', (e) => {
e.preventDefault()
dropArea.classList.remove('drag-over')
handleFiles(e.dataTransfer.files)
})
countButton.addEventListener('click', async () => {
errorDiv.textContent = ''
outputDiv.textContent = 'Counting tokens...'
countButton.disabled = true
try {
const result = await countTokens(
systemInput.value.trim(),
contentInput.value.trim()
)
outputDiv.textContent = JSON.stringify(result, null, 2)
} catch (error) {
errorDiv.textContent = error.message
outputDiv.textContent = ''
} finally {
countButton.disabled = false
}
})
</script>
</body>
</html>