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nlohmann committed 2026-10-21 21:00:39 +00:00
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@@ -11,7 +11,27 @@ file that gives `json`/`ordered_json` values a friendly, key/value debugger view
fields, when debugging with the MSVC debug engine (`cppvsdbg`) in Visual Studio or VS Code.
The checked-in visualizers cover namespace variants with zero, one, or two ABI tags. Configurations with three or more
ABI tags are not covered and may show raw internal fields instead.
ABI tags are not covered and may show raw internal fields instead. To generate a Natvis file for such a configuration:
1. Check out the release tag of the library version you use.
2. List the ABI tags and the macros that enable them:
```shell
make natvis NATVIS_ARGS="--list-tags"
```
3. Generate a Natvis file with the tags of your configuration, for example for `JSON_DIAGNOSTICS`,
`JSON_DIAGNOSTIC_POSITIONS`, and `JSON_VIEW_NO_SIMD`:
```shell
make natvis NATVIS_ARGS="--abi-tags _diag,_dp,_vns --output my_nlohmann_json.natvis"
```
4. Use the generated file instead of `nlohmann_json.natvis`.
`--abi-tags` can be repeated for several configurations, and `--all` generates every combination (about 60 MB for 12
ABI tags, doubling with each further tag). See
[`tools/generate_natvis`](https://github.com/nlohmann/json/tree/develop/tools/generate_natvis) for all options.
Debug engines that wrap LLDB instead of the MSVC debug engine (for example, `codelldb` in VS Code) only have
partial/experimental Natvis support, and commonly fall back to showing raw internal fields even with the