Open JSON as a collapsible tree and walk the structure level by level instead of scrolling one long line. It runs in your browser and nothing is uploaded.
Your files are processed in your browser, on your own device. Nothing is uploaded to a server.
A JSON Viewer turns raw JSON into a collapsible tree, so you can open one branch at a time and walk the structure level by level. Paste a response or a file and the tree builds in your browser. It is free, nothing is uploaded, and there is no account and no cap on use.
Paste JSON into the box and the viewer builds a tree from it. Objects and arrays become branches you can open and close. Leaf values sit at the ends of the branches, so a deep document reads like a set of folders rather than one long scroll of brackets and commas.
The tree and the text are two views of the same data. The viewer never edits anything. Opening and closing branches only changes what you see, and the download gives you the document formatted with indentation if you want to keep or share it. If the JSON will not parse, you see the parser error instead of a half built tree.
Exploring an unfamiliar API response is the main event. Documentation tells you the fields that matter to the writer. The live response holds everything, including the nested objects nobody documented. Opening branches one at a time lets you map what is really there, find where a value hides, and see how deep the nesting runs before you write code against it.
Comparing shapes is close behind. Two responses from the same endpoint, one for a free account and one for a paid one, differ in ways a text diff makes noisy. A tree view keeps each response folded down to its outline, so extra branches and missing branches show up as shape, not as scrolling.
Support and debugging work benefit as well. A customer or a teammate sends a payload, and the question is always the same: what is actually in it. The tree answers that question in the order a person asks it, from the outside in. When you need the same data as a table instead, the JSON to CSV converter flattens it into rows and columns.
The viewer is read only. You can open, close and read, and that is the whole list. It does not edit values, add keys or save changes back into the document. If you need to change the data, edit the source and paste it again. Pages that borrow editor language for a viewer are overselling, and this one would rather be plain about it.
Very large documents meet a node budget. The tree shows at most 4,000 nodes, and when a document has more, a note on the page says the cap was hit and the tree is partial. That budget keeps a multi megabyte paste from freezing your tab while it builds thousands of rows. For a document that size, narrow it down before viewing: pull the section you need into its own smaller JSON and open that.
Depth is the other practical matter. JSON nested hundreds of levels deep makes any tree hard work, and most real data never goes there. If your tree feels endless, the shape of the data is the story, and the JSON Formatter stats line can tell you the exact maximum depth before you start opening branches.
The tree is built on your device. Your JSON is not sent to a server, not stored by ToolPeko and not read by anyone here. Paste a payload with private records in it and it stays in the tab where you pasted it. There is no account, no daily cap and no run limit.
A formatter rewrites JSON as indented text. A viewer renders it as a tree you can open and close branch by branch. Use the formatter to read a document top to bottom, and the viewer to explore one part of a deep document at a time.
No. The viewer is read only. Opening and closing branches changes only what is on screen, never the data. Edit the source text and paste it again if something needs to change.
The tree shows at most 4,000 nodes, and a note appears when that cap is hit. The budget keeps very large pastes from freezing the tab. Split the document and view the part you need.
The same document as pretty printed JSON in a file, formatted with indentation so it is easy to read, keep or share.
You see the parser error message instead of a tree. The JSON Validator on this site shows the line and column of the problem, which makes the fix easier to find.
No. The tree is built in your browser on your own device. Nothing you paste is sent to or stored on a ToolPeko server.
Same rules as this one: free, in your browser, with nothing uploaded.
Paste messy JSON, get it neat and valid.
Check JSON and find the exact line that breaks it.
Squeeze JSON down to one tight line.
JSON rows turned into a CSV a spreadsheet can open.
A CSV file turned into clean JSON objects.
JSON rewritten as YAML for config files.
YAML config turned into JSON you can use in code.
Indent messy XML so its structure makes sense.