Object Value Type Histogram
Histogram top-level own JSON value types, distinguishing null, arrays and objects without recursive leaf counting.
Description
Histogram top-level own JSON value types, distinguishing null, arrays and objects without recursive leaf counting.
A value-type histogram summarizes the immediate contents of an object. Distinguishing arrays, objects and null avoids JavaScript's broad object-type grouping.
When to use this tool
Histogram top-level own JSON value types, distinguishing null, arrays and objects without recursive leaf counting.
- Prepare the supplied objectJson fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter objectJson. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.histogram. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Decode an object, classify each own member value with the JSON-aware type helper, and count occurrences of each type in a histogram.1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| objectJson | JSON text, entered as one text field. The decoded structure is illustrated below; it is not a separate file. | Text |
For the JSON text fields, the following decoded structures show the example records before they are serialized into input strings. Keep field names, list nesting and value types as shown.
[
{
"field": "objectJson",
"decoded": {
"a": 1,
"b": null,
"c": []
}
}
]| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.histogram | The histogram value under the stated formula or text convention. |
{
"input": {
"objectJson": "{\"a\":1,\"b\":null,\"c\":[]}"
},
"output": {
"result": {
"histogram": {
"number": 1,
"null": 1,
"array": 1
}
}
}
}Limitations and assumptions
- Only immediate values contribute. Nested contents are not traversed, and an empty object yields an empty histogram rather than evidence about an expected schema.
- Decoded JSON is bounded to 20,000 nodes and 32 nesting levels; record arrays have at most 128 records. Parsed number values use JavaScript floating point rather than arbitrary-precision decimal arithmetic.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Ordinary string lists have at most 128 entries of at most 128 code units each; numeric lists and matrices have separate bounded size checks. Nonfinite results and excessively large serialized outputs are rejected.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
For document-wide requirements, combine these structural inventories with an explicit JSON Schema. Preserve the distinction between missing properties and null values, and between numbers and numeric-looking strings when building joins or indexes.
References
Similar or alternative tools
- JSON Leaf Type Path Inventory
Inventory JSON scalar leaves with escaped RFC 6901 paths; empty containers have no scalar leaf and are not misclassified as values.
- json leaf value redaction
Replace only specified scalar-leaf pointer paths in one pass; unmatched or container paths are reported rather than blindly deleted.