JSON Viewer
Paste JSON to explore it as a collapsible tree. Click any node to expand or collapse it; use Expand/Collapse all to navigate large documents.
Example
Paste a nested object or array and the viewer renders it as an interactive tree — objects and arrays become expandable nodes, with values colour-coded by type.
How it works
The viewer parses your JSON into a structure and renders each object and array as a collapsible node. Strings, numbers, booleans and nulls are colour-coded so the shape of your data is easy to scan.
Good to know
JSON Viewer turns a wall of raw JSON into an interactive, collapsible tree so you can see the shape of your data instead of squinting at brackets and commas. Paste in an API response, a config file, a log payload, or anything else that uses JSON, and each object and array becomes a clickable node you can expand or collapse. It's built for developers, QA testers, data analysts, and anyone who works with JSON over HTTP and needs to inspect a structure quickly.
Reach for it when JSON is too large or too deeply nested to read as a flat string — for example, drilling into a single record buried inside a paginated API response, or confirming whether a field is an array of objects versus a single object. Because it only displays data and never rewrites it, it's also a safe first step before you edit or transform JSON elsewhere: you look, confirm the structure, then act.
To read the result, follow the tree: keys are highlighted, and each value is colour-coded by its JSON type so strings, numbers, booleans, and null are visually distinct at a glance. That colouring is also a quick correctness check — a number wrapped in quotes will render with the string colour, and a missing value shows as null, which helps you spot type mismatches that cause bugs downstream. Use Expand all to survey everything, or Collapse all and open only the branch you care about.
A practical tip: the viewer needs syntactically valid JSON, so trailing commas, single quotes, unquoted keys, or JavaScript-style comments will stop it from rendering. If it won't parse, that's a signal your source isn't strict JSON yet. Everything runs locally in your browser, which means even very large payloads stay on your device — but extremely huge documents are still limited by your machine's memory, so collapse branches you don't need to keep things responsive.
Frequently asked questions
Can it handle large or deeply nested JSON?
Yes — nodes are collapsible, so you can drill into exactly the part you care about and collapse the rest.
What do the colours mean?
Keys are highlighted, and values are coloured by type: strings, numbers, booleans and null each get their own colour.
Is my JSON uploaded anywhere?
No — everything runs in your browser with JavaScript. Your data never leaves your device, so it's safe for sensitive payloads and works offline once loaded.
Is this tool free?
Yes, completely free with no sign-up and no limits.
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People also ask
What is the difference between a JSON viewer and a JSON formatter?
A JSON viewer renders data as an interactive, collapsible tree you can navigate node by node, while a formatter (or beautifier) outputs re-indented JSON as plain text. A viewer is for exploring structure; a formatter is for producing clean, readable text you can copy.
How do I view a large JSON file without it freezing?
Use a tool that supports collapsible nodes so you can keep most branches collapsed and expand only the section you need. Avoid expanding everything at once on very large files, since rendering thousands of nodes simultaneously is what tends to slow a browser down.
Why does my JSON show an error and won't display?
The most common causes are trailing commas, single quotes instead of double quotes, unquoted keys, comments, or a missing bracket or brace. JSON is a strict format, so any of these will prevent parsing until corrected.
Can I view JSON offline?
Yes, if the tool runs entirely client-side in JavaScript it works without a network connection once the page has loaded, because parsing and rendering happen locally in your browser.
Is it safe to paste sensitive or private data into an online JSON viewer?
It depends on the tool. With a fully client-side viewer, the data is processed in your browser and is not uploaded to a server, so it does not leave your device; with server-based tools, your JSON may be transmitted, so check how the tool handles data first.
How can I find a specific key or value inside nested JSON?
Collapse all nodes first, then expand the branches that match the path you expect the field to live under. You can also use your browser's built-in find (Ctrl+F or Cmd+F) to locate visible text within expanded sections of the tree.
What do the different colours mean in a JSON tree view?
Colours indicate value types: keys are highlighted, and strings, numbers, booleans, and null each get a distinct colour. This lets you confirm at a glance whether a value is, for example, the number 5 or the string "5".
Does viewing JSON change or reformat the original data?
No, a viewer only parses and displays your JSON; it does not alter the underlying values, key order, or types. To rewrite, indent, or minify the text you would use a formatter or editor instead.