JSON Viewer
View and explore your JSON data with a formatted representation, structural statistics, and a breakdown of value types across all nesting levels.
{
"company": "Acme Corp",
"founded": 1999,
"employees": 1200,
"headquarters": {
"city": "San Francisco",
"country": "USA"
},
"products": [
"Widget A",
"Widget B",
"Widget C"
],
"listed": true
} 使い方
計算式
JSON.parse(input) → structured analysis 計算例
An API response with 45 keys, 3 nesting levels, 12 strings, 8 numbers, and 2 booleans is instantly summarized.
What the JSON Viewer Shows
When you paste JSON into the viewer, it reports:
| Statistic | Description |
|---|---|
| Root Type | Whether the top-level container is an Object, Array, or primitive |
| Total Keys | Sum of all keys across every object in the document |
| Nesting Depth | Maximum depth from root to deepest leaf value |
| Type Breakdown | Count of string, number, boolean, and null values in the entire document |
This structural overview is particularly useful when receiving an unfamiliar API response and needing to quickly understand its shape before writing parsing code.
よくある質問
What is a JSON viewer?
A JSON viewer displays raw or minified JSON in a readable, formatted layout and provides structural metadata such as key counts, type statistics, and nesting depth without requiring any code.
What value types does JSON support?
JSON supports six types: string (text in double quotes), number (integer or float), boolean (true/false), null, object (key-value pairs in {}), and array (ordered list in []).
What is nesting depth?
Nesting depth measures how many container levels deep the most nested value is. A flat object is depth 1. Each additional nested object or array increases depth by 1.
Is my data private when using this tool?
Yes. The viewer uses your browser's native JSON.parse() and JSON.stringify() APIs entirely client-side. No data is transmitted to any external server.