JSON Parser
Parse any JSON string and instantly see its structure: root type, total key count across all nesting levels, maximum depth, and a fully pretty-printed representation.
{
"user": {
"id": 42,
"name": "Alice",
"roles": [
"admin",
"editor"
]
},
"active": true,
"score": 98.5
} Hoe het werkt
Formule
JSON.parse(jsonString) Praktijkvoorbeeld
'{"user":{"id":1,"roles":["admin"]}}' parses to root type Object with 3 total keys and nesting depth 2.
Understanding JSON Structure
JSON has six data types: string, number, boolean, null, object, and array. Objects are unordered key-value maps; arrays are ordered sequences. This parser reports:
- Root Type — whether the top-level value is an object, array, string, number, or other primitive.
- Root Keys / Items — number of direct children of the root container.
- Total Keys — all keys across every nesting level, giving a sense of total payload complexity.
- Max Nesting Depth — how deeply nested the structure is (relevant for recursive algorithms and stack limits).
Veelgestelde vragen
What does a JSON parser do?
A JSON parser reads a JSON-encoded string and converts it into native data structures (objects, arrays, strings, numbers, booleans, null) that a program can inspect and manipulate.
What is JSON nesting depth?
Nesting depth is the maximum number of container levels (objects or arrays) from the root to the deepest leaf value. A flat object has depth 1; each additional nested object increases depth by 1.
Why does my JSON fail to parse?
Common causes: trailing commas after the last element, single quotes instead of double quotes, unquoted keys, JavaScript comments, or undefined/NaN values — none of which are valid in standard JSON (RFC 8259).
Is my data safe when using this parser?
Yes. All parsing happens 100% client-side in your browser using the native JSON.parse() API. No data is sent to any server.