JSON Viewer

What is a JSON viewer?

A JSON viewer renders a JSON document as a structured, interactive tree instead of a wall of text. Objects and arrays become collapsible nodes, values are colour-coded by type, and every node carries the path you would use to reach it in code.

That matters as soon as a document grows past a screenful. A 4,000-line API response is nearly unreadable as text, but as a tree you can collapse the parts you do not care about and drill straight into the branch you do.

How to view JSON

• Paste your JSON into the editor, drop a .json file onto it, or click Upload.
• Jsonviewpro validates as you type — you will see either a green “Valid JSON” badge or the exact line and column of the problem.
• The tree opens on the right. Use the chevrons to expand and collapse, or Expand all / Collapse all for the whole document.
• Click any node to select it; the toolbar and context menu let you copy its value, its key, its JSON path or the whole sub-tree.

How to search JSON

Press Cmd/Ctrl + K to focus the search box. Plain text matches keys, values and paths at once. For narrower searches use the field prefixes:

• key:email — only property names
• value:gmail — only values
• path:users — only JSON paths
• type:string — only values of one JSON type

Combine them freely — key:email type:string finds string values stored under an email key. Regular expressions and case-sensitive matching are one click away, and “Expand matching nodes” opens every branch that contains a hit.

How to inspect nested JSON

Deeply nested documents are where paths pay off. Select a node and copy its path — you get something like $.users[42].profile.email, ready to paste into a JSONPath query, a jq filter or your application code.

The “Find similar” action searches for every node that shares the selected key, which is the fastest way to answer questions like “what values does status actually take across this response?”

How to work with large JSON

Jsonviewpro renders the tree with virtualization: only the rows currently on screen exist in the DOM, so a document with hundreds of thousands of nodes scrolls smoothly. Parsing, analysis, search and conversion run in a Web Worker, so the interface stays responsive while they work.

Very large files are flagged before processing so you can decide whether to continue, and nothing is uploaded — the memory used is your browser tab’s, not a server’s.

Is Jsonviewpro private?

Yes. Viewing, formatting, validating, searching, analyzing, diffing and converting all happen in your browser with JavaScript. Your JSON is never sent to a Jsonviewpro server, never written to a log, never placed in a URL and never passed to analytics.