JSON Viewer Online
View and inspect JSON files directly in your browser. Browse rows, check column names and data types — no upload required, your data stays on your device.
Drop your .json file here
or click to browse — max 50 MB
About this tool
Preview the contents of a JSON file directly in your browser. See column names, data types, and the first 500 rows without opening Excel or writing any code. Nothing is uploaded — the file is read locally in your browser.
Frequently Asked Questions
How many rows does the JSON viewer show?
The viewer loads up to 500 rows for preview. For browsing or filtering larger datasets use the SQL Query tool, which can run arbitrary queries against the full file.
Can I search or filter within the JSON viewer?
Column sorting is available in the results table. For row-level filtering use the Filter tool or the SQL Query tool.
What information does the JSON viewer show?
Column names, detected data types, total row count, and the first 500 rows of data. It is useful for a quick sanity check before running heavier operations.
Is my data private?
Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.
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