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2026-10-12 07:35:31 +00:00
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features/json_pointer/index.html
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features/json_pointer/index.md
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@@ -73,6 +73,8 @@ auto val2 = j.at(json::json_pointer("/nested/three/1")); // false
auto val3 = j.value(json::json_pointer("/nested/four"), 0); // 0
```
To read a value with a fallback, use [`value`](https://json.nlohmann.me/api/basic_json/value/index.md) with a JSON Pointer; to test for existence, use [`contains`](https://json.nlohmann.me/api/basic_json/contains/index.md). Neither needs intermediate checks, see [Nested values](https://json.nlohmann.me/features/element_access/default_value/#nested-values).
Creating intermediate levels that don't exist
See the [`operator[]` notes](https://json.nlohmann.me/api/basic_json/operator%5B%5D/#return-value) for how array vs. object is decided when a pointer creates intermediate levels that don't exist yet.
@@ -119,6 +121,7 @@ auto j_original = j_flat.unflatten();
## See also
- Class [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md)
- Functions [`value`](https://json.nlohmann.me/api/basic_json/value/index.md), [`contains`](https://json.nlohmann.me/api/basic_json/contains/index.md), and [`at`](https://json.nlohmann.me/api/basic_json/at/index.md) accept JSON Pointers; see [Nested values](https://json.nlohmann.me/features/element_access/default_value/#nested-values)
- Function [`flatten`](https://json.nlohmann.me/api/basic_json/flatten/index.md)
- Function [`unflatten`](https://json.nlohmann.me/api/basic_json/unflatten/index.md)
- [JSON Patch](https://json.nlohmann.me/features/json_patch/index.md) - paths inside a patch are JSON Pointers