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# Available Feature Flags
This crate has the following features which can be enabled.
Each entry will explain the feature in more detail.
`serde_with` is fully `no_std` compatible.
Using it in a `no_std` environment requires using `default-features = false`, since `std` is enabled by default.
1. [`alloc`](#alloc)
2. [`std` (default)](#std-default)
3. [`base64`](#base64)
4. [`chrono_0_4`](#chrono_0_4)
5. [`guide`](#guide)
6. [`hex`](#hex)
7. [`indexmap_1`](#indexmap_1)
8. [`json`](#json)
9. [`macros` (default)](#macros-default)
10. [`time_0_3`](#time_0_3)
## `alloc`
Enable support for types from the `alloc` crate when running in a `no_std` environment.
## `std` (default)
Enables support for various types from the std library.
This will enable `std` support in all dependencies too.
The feature enabled by default and also enables `alloc`.
## `base64`
The `base64` feature enables serializing data in base64 format.
This pulls in `base64` as a dependency.
It enables the `alloc` feature.
## `chrono_0_4`
The `chrono_0_4` feature enables integration of `chrono_0_4` specific conversions.
This includes support for the timestamp and duration types.
More features are available in combination with `alloc` or `std`.
The legacy feature name `chrono` is still available for v1 compatability.
This pulls in `chrono` v0.4 as a dependency.
## `guide`
The `guide` feature enables inclusion of this user guide.
The feature only changes the rustdoc output and enables no other effects.
## `hex`
The `hex` feature enables serializing data in hex format.
This pulls in `hex` as a dependency.
It enables the `alloc` feature.
## `indexmap_1`
The `indexmap_1` feature enables implementations of `indexmap_1` specific checks.
This includes support for checking duplicate keys and duplicate values.
The legacy feature name `indexmap` is still available for v1 compatability.
This pulls in `indexmap` as a dependency.
It enables the `alloc` feature.
Some functionality is only available when `std` is enabled too.
## `json`
The `json` features enables JSON conversions from the `json` module.
This pulls in `serde_json` as a dependency.
It enables the `alloc` feature.
## `macros` (default)
The `macros` features enables all helper macros and derives.
It is enabled by default, since the macros provide a usability benefit, especially for `serde_as`.
This pulls in `serde_with_macros` as a dependency.
## `time_0_3`
The `time_0_3` enables integration of `time` v0.3 specific conversions.
This includes support for the timestamp and duration types.
This pulls in `time` v0.3 as a dependency.
Some functionality is only available when `alloc` or `std` is enabled too.