Big JSON / CSV Viewer
Open large JSON or CSV files without freezing the page: parsed in a worker, browsed as a tree or a table.
About this tool
Open a JSON or CSV file (JSON up to 200 MB, CSV up to 40 MB) and browse it as a tree or a table. Only the rows on screen are drawn, so even long arrays scroll smoothly.
The file is parsed in a background worker and stays in your browser. Click a key to see its value as formatted JSON, cut at 1 MB. Parsing is stopped after 60 seconds, and Stop ends it sooner.