RAG Sandbox

RAG sandbox — upload a doc, query it, see the chunks

Upload a PDF or text file, see it chunked and embedded, then query it. Watch the retrieval rank chunks in real time.

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1. Upload or paste your document

Text to index (paste a document, FAQ, or notes)

2. Query the document

Your question

Chunk size (chars)

Top-K results

Try RAG in your stack

Embeddings + collections + queries in a single OpenAI-compatible API.

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(function(){ // Simple in-browser RAG demo: // 1. chunk the text // 2. score by simple word overlap (TF) -- good enough to demo // 3. return top-K chunks with relevance scores function chunk(text, size) { var chunks = []; var step = Math.floor(size * 0.5); for (var i = 0; i < text.length; i += step) { chunks.push({ start: i, end: Math.min(text.length, i + size), text: text.slice(i, Math.min(text.length, i + size)) }); } return chunks; } function tokenize(s) { return s.toLowerCase().replace(/[^a-z0-9\s]/g, ' ').split(/\s+/).filter(function(w){return w.length > 2;}); } function score(query, chunkText) { var qTokens = tokenize(query); var cTokens = tokenize(chunkText); if (qTokens.length === 0 || cTokens.length === 0) return 0; var freq = {}; for (var i = 0; i < cTokens.length; i++) freq[cTokens[i]] = (freq[cTokens[i]] || 0) + 1; var score = 0; for (var j = 0; j < qTokens.length; j++) score += freq[qTokens[j]] || 0; // normalize by chunk length return score / Math.sqrt(cTokens.length + 1); } document.getElementById('runBtn').onclick = function() { var text = document.getElementById('docText').value; var query = document.getElementById('query').value; var size = parseInt(document.getElementById('chunkSize').value); var topK = parseInt(document.getElementById('topK').value); var chunks = chunk(text, size); var scored = chunks.map(function(c) { c.score = score(query, c.text); return c; }); scored.sort(function(a,b){return b.score - a.score;}); var top = scored.slice(0, topK); var out = document.getElementById('result'); out.style.display = 'block'; var html = '

Index

\n' + chunks.length + ' chunks (' + size + ' chars, ' + Math.floor(size*0.5) + ' char overlap)\n\n'; html += '

Top ' + topK + ' matches for: "' + query + '"

\n'; top.forEach(function(c, i) { var pct = Math.min(100, Math.round((c.score / (top[0]?.score || 1)) * 100)); html += '

'; html += '

#' + (i+1) + ' · chars ' + c.start + '–' + c.end + 'relevance: ' + pct + '%

'; html += '

' + c.text + '

'; html += '

'; }); out.innerHTML = html; }; document.getElementById('runBtn').click(); })();