Fast Online JSON Visualizer & Stream Parser
Visualize streaming AI API responses, chunked data, SSE, and NDJSON payloads directly in the browser.
Paste a Streaming Response
Supports SSE (Server-Sent Events), NDJSON, OpenAI, and Anthropic streaming formats. Visualize chunks, replay the stream, and convert between formats.
How to Use Fast Online JSON Visualizer & Stream Parser
Paste your streaming response. The parser auto-detects the format (SSE, NDJSON, OpenAI, Anthropic), extracts each chunk, shows the data visually, and reconstructs the full text. Use replay to simulate streaming.
🔒 Privacy First: This tool runs entirely in your browser. Your data never leaves your computer.
Common Use Cases
- Debug AI API streaming responses
- Visualize chunk-by-chunk content from ChatGPT/Claude
- Test frontend streaming UI without hitting APIs
- Convert between OpenAI and Anthropic formats
- Extract full text from streaming response logs
Fast Online JSON Visualizer & Stream Parser FAQ
SSE (Server-Sent Events with data: prefix), NDJSON (newline-delimited JSON), OpenAI streaming format, and Anthropic streaming format.
In browser DevTools Network tab, find the streaming request, click it, and copy the EventStream or response body. Or capture programmatically by logging response chunks.
SSE uses "data:" prefixes and is the EventSource format (OpenAI uses this). NDJSON is just JSON objects separated by newlines (Anthropic uses this).
Yes! Parse any supported format and export to SSE, NDJSON, JSON Array, or plain text.