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JSON Tree Viewer

Details

How to use JSON Tree Viewer

What the tool does, how to run it, and what to expect from the result.

How to explore JSON as a collapsible tree

A raw API response is a wall of braces. A tree view gives you the shape first (three objects, each with five fields, one of which is an array of twelve) and the values second, which is the order you actually need them in when you are trying to understand a payload.

Paste JSON here and it is parsed and rendered as a colour-coded collapsible tree in your browser, with parse errors reported the moment they appear.

  • Paste your JSON into the input pane. The tree updates as you type.
  • Click any object or array node to expand or collapse it, or use Expand all and Collapse all.
  • Read the colour coding: strings green, numbers blue, booleans magenta, null grey.
  • Fix any parse error, which reports the exact character position of the problem.
  • Click Copy formatted for a normalized two-space-indented version.
Tips

Getting a better result out of JSON Tree Viewer

Specific settings and thresholds, not general advice.

  • This parses with the browser's native JSON.parse, which is strict JSON: no comments, no trailing commas, no single quotes, no unquoted keys. If your file is really JSON5 or a JavaScript object literal, it will be rejected, and the error message will tell you the exact character offset.
  • Duplicate keys are not an error in JSON, and JSON.parse silently keeps the last one. So a file with two "id" fields will show one in the tree, and the tree is telling you the truth about what any JavaScript consumer will see. This is a real source of production bugs in hand-edited config.
  • Numbers go through IEEE 754 doubles, so a 64-bit integer ID such as 9007199254740993 loses precision the moment it is parsed. If your API returns snowflake IDs or large integers, they are already corrupted before the tree renders them, and the fix is to have the API send them as strings.
  • Copy formatted runs JSON.stringify with two-space indent on the parsed value, which means the output is normalized, not your original text. Key order is preserved for string keys, but integer-like keys get reordered ahead of them by the JavaScript object spec.
  • Expand all walks every branch, so a deeply nested 10MB API response will render tens of thousands of DOM nodes and can stall the tab. Explore branch by branch on large payloads.
Limits

What JSON Tree Viewer does not do

The honest boundary, so you do not lose time finding it yourself.

  • Strict JSON only. No JSON5, JSONC, comments, or trailing commas.
  • Read-only. You cannot edit a value in the tree.
  • No search, no JSONPath or jq query, and no path copying.
  • No schema validation and no diff between two JSON documents.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsJSONJSON (JavaScript Object Notation) is a lightweight, text-based format for storing and exchanging structured data as key/value pairs and ordered lists. It is human-readable, language-independent, and the default format for most web APIs and config files.General
At a glance

Who JSON Tree Viewer is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Developers exploring JSON API responses and configs.

Ideal for

Using the json tree viewer without installing anything or signing up.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Why is my file rejected when it looks like valid JSON?

Strict JSON forbids several things that look fine: comments, a trailing comma after the last item, single-quoted strings, and unquoted object keys. All four are legal in a JavaScript object literal and in JSON5, and none of them are legal JSON. The parse error names the character offset, so start there.

What happens if my JSON has duplicate keys?

JSON.parse keeps the last one and discards the earlier ones without complaint, and that is what the tree shows. It is not the viewer hiding data: any JavaScript consumer of that file will see exactly the same thing. If a hand-edited config is behaving strangely, duplicate keys are worth checking for.

Why does my large ID number look wrong?

JSON numbers are parsed as IEEE 754 doubles, which can represent integers exactly only up to 2^53 - 1, or 9007199254740991. A 64-bit ID above that is rounded during parsing, before any viewer sees it. This is a property of JavaScript, not of this tool. APIs that use 64-bit IDs should serialize them as strings.

Can I edit values in the tree?

No. The tree is a read-only view for exploring structure. Edit the text in the input pane and the tree re-renders as you type, which is the same workflow with fewer surprises. Copy formatted gives you a normalized, two-space-indented version of whatever currently parses.

Is my JSON uploaded anywhere?

No. Parsing happens with JSON.parse in your own tab and the tree is rendered from the result in memory. Nothing is sent to a server, which means you can paste a production API response containing customer data without it leaving your machine.

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