Only the visible rows are drawn
The tree draws what is on screen and nothing else, and a big list opens in pages of 10,000 items. Reading, searching and filtering run in the background.
jsonloupe
Open large JSON files
Open the JSON file that froze your last viewer. A list of five million items opens at once, and the page stays responsive while you scroll, search and filter.
Other viewers draw every row and every value before you see anything. This one draws only the rows on your screen.
0 bytes uploaded · no account · free
Paste JSON
nothing leaves this tab
for big files, “open a file instead” reads the file straight from your disk — .json, .jsonl and .zst
⌃↵ to open
Why big files open here
Compressed files open directly
Open .json, .jsonl and Zstandard .zst files, or paste Base64-Zstd text. They are decoded in your browser, not on a server.
Long IDs keep every digit
IDs longer than 15 digits can be rounded by other viewers. Here they stay exactly as they are in the file.
Find the heavy part
Each closed branch shows its size in bytes, so the part that makes the file big is easy to find. Search by text or pattern, and filter the tree to the matches.
Ask questions without code
Count, group and filter with short queries that run in this tab, for example the failed tasks grouped by reason.
$.tasks[?(@.status == 'FAILED')] | group(@.reason)
Why nothing is uploaded
The viewer runs inside this browser tab. Your file is read here and nowhere else. There is no server to send your file to, which is why it keeps working with your wifi off. Nothing is logged, counted, or kept anywhere but your own computer.
bytes uploaded0
largest file200 MB
works with wifi offyes
pricefree · MIT