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json/api/basic_json/parse_event_t.md
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2026-07-08 18:19:46 +00:00

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# <small>nlohmann::basic_json::</small>parse_event_t
```cpp
enum class parse_event_t : std::uint8_t {
object_start,
object_end,
array_start,
array_end,
key,
value
};
```
The parser callback distinguishes the following events:
- `object_start`: the parser read `{` and started to process a JSON object
- `key`: the parser read a key of a value in an object
- `object_end`: the parser read `}` and finished processing a JSON object
- `array_start`: the parser read `[` and started to process a JSON array
- `array_end`: the parser read `]` and finished processing a JSON array
- `value`: the parser finished reading a JSON value
## Examples
![Example when certain parse events are triggered](../../images/callback_events.png)
## See also
- [parser_callback_t](parser_callback_t.md) callback function type for the parser
- [parse](parse.md) deserialize from a compatible input
## Version history
- Added in version 1.0.0.