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2026-09-15 20:47:46 +00:00
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api/basic_json/unflatten/index.md
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@@ -33,7 +33,11 @@ Linear in the size of the JSON value.
## Notes
Empty objects and arrays are flattened by [`flatten()`](https://json.nlohmann.me/api/basic_json/flatten/index.md) to `null` values and cannot unflattened to their original type. Apart from this example, for a JSON value `j`, the following is always true: `j == j.flatten().unflatten()`.
Empty objects and arrays are flattened by [`flatten()`](https://json.nlohmann.me/api/basic_json/flatten/index.md) to `null` values and cannot unflattened to their original type.
A flattened array and a flattened object whose keys are array indices are indistinguishable, because both are described by the same JSON pointers. A value is therefore restored as an array if and only if one of its keys is the reference token `0`, and as an object otherwise: `{"2": 1}` is restored unchanged, whereas `{"0": 1}` is restored as `[1]`. This decision does not depend on the order in which the flattened object is iterated.
Apart from these two cases, for a JSON value `j`, the following is always true: `j == j.flatten().unflatten()`.
## Examples
@@ -100,3 +104,4 @@ Output:
## Version history
- Added in version 2.0.0.
- Made the array/object decision independent of the object's iteration order in version 3.13.0.