JSON & CSV Data Viewer
Inspect raw data structures safely. Parse massive JSON arrays or CSV sheets without sending your data to external formatters.
The danger of online formatters
If you're a developer, you've likely copied a massive JSON payload from an API response and pasted it into a site like "jsonformatter.org" to make it readable. You just handed your unredacted data—potentially containing PII, API keys, or proprietary business logic—to a server you don't control.
uplayfile processes text data locally using Web Workers. We parse the string, format it, apply syntax highlighting, and render it to the DOM without a single byte leaving your machine.
Processing Large Datasets
Browsers struggle to render huge DOM trees. If you try to syntax-highlight a 10MB JSON file in one go, the main thread will lock up and the tab will crash.
We mitigate this by utilizing a virtualized list approach for data rendering. Only the nodes visible on screen (plus a small buffer) are actually inserted into the DOM. This allows you to smoothly scroll through hundreds of thousands of lines of JSON or CSV rows without performance degradation.
CSV Parsing Benchmarks
Features
- JSON Collapse/Expand: Navigate deep object trees easily.
- CSV Column Sorting: Sort massive datasets locally in memory.
- Strict Mode: Validate JSON against strict syntax rules and pinpoint exact line errors.