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json/api/json_sax/start_object.md
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2026-07-08 18:19:46 +00:00

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# <small>nlohmann::json_sax::</small>start_object
```cpp
virtual bool start_object(std::size_t elements) = 0;
```
The beginning of an object was read.
## Parameters
`elements` (in)
: number of object elements, or `#!cpp std::numeric_limits<std::size_t>::max()` if unknown
## Return value
Whether parsing should proceed.
## Notes
Binary formats may report the number of elements.
## Examples
??? example
The example below shows how the SAX interface is used.
```cpp
--8<-- "examples/sax_parse.cpp"
```
Output:
```json
--8<-- "examples/sax_parse.output"
```
## Version history
- Added in version 3.2.0.