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<!DOCTYPE HTML>
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<title>Container attributes · Serde</title>
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Attributes
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Container attributes
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Variant attributes
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Field attributes
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Default value for a field
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Struct flattening
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Handwritten generic type bounds
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Serialize enum as number
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Serialize fields as camelCase
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Skip serializing field
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Derive for remote crate
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Manually deserialize struct
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<!-- Title -->
<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href="." >Container attributes</a>
</h1>
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<section class="normal markdown-section">
<h1 id="container-attributes"><a name="container-attributes" class="plugin-anchor" href="#container-attributes"><i class="fa fa-link" aria-hidden="true"></i></a>Container attributes</h1>
<ul>
<li><h5 id="rename"><a name="rename" class="plugin-anchor" href="#rename"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(rename = "name")]</code> </h5>
<p>Serialize and deserialize this struct or enum with the given name instead of
its Rust name.</p>
<p>Allows specifying independent names for serialization vs deserialization:</p>
<ul>
<li><code>#[serde(rename(serialize = "ser_name"))]</code></li>
<li><code>#[serde(rename(deserialize = "de_name"))]</code></li>
<li><code>#[serde(rename(serialize = "ser_name", deserialize = "de_name"))]</code></li>
</ul>
</li>
<li><h5 id="rename_all"><a name="rename_all" class="plugin-anchor" href="#rename_all"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(rename_all = "...")]</code> </h5>
<p>Rename all the fields (if this is a struct) or variants (if this is an enum)
according to the given case convention. The possible values are <code>"lowercase"</code>,
<code>"UPPERCASE"</code>, <code>"PascalCase"</code>, <code>"camelCase"</code>, <code>"snake_case"</code>,
<code>"SCREAMING_SNAKE_CASE"</code>, <code>"kebab-case"</code>, <code>"SCREAMING-KEBAB-CASE"</code>.</p>
<p>Allows specifying independent cases for serialization vs deserialization:</p>
<ul>
<li><code>#[serde(rename_all(serialize = "..."))]</code></li>
<li><code>#[serde(rename_all(deserialize = "..."))]</code></li>
<li><code>#[serde(rename_all(serialize = "...", deserialize = "..."))]</code></li>
</ul>
</li>
<li><h5 id="rename_all_fields"><a name="rename_all_fields" class="plugin-anchor" href="#rename_all_fields"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(rename_all_fields = "...")]</code> </h5>
<p>Apply a <code>rename_all</code> on every struct variant of an enum according to the
given case convention. The possible values are <code>"lowercase"</code>,
<code>"UPPERCASE"</code>, <code>"PascalCase"</code>, <code>"camelCase"</code>, <code>"snake_case"</code>,
<code>"SCREAMING_SNAKE_CASE"</code>, <code>"kebab-case"</code>, <code>"SCREAMING-KEBAB-CASE"</code>.</p>
<p>Allows specifying independent cases for serialization vs deserialization:</p>
<ul>
<li><code>#[serde(rename_all_fields(serialize = "..."))]</code></li>
<li><code>#[serde(rename_all_fields(deserialize = "..."))]</code></li>
<li><code>#[serde(rename_all_fields(serialize = "...", deserialize = "..."))]</code></li>
</ul>
</li>
<li><h5 id="deny_unknown_fields"><a name="deny_unknown_fields" class="plugin-anchor" href="#deny_unknown_fields"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(deny_unknown_fields)]</code> </h5>
<p>Always error during deserialization when encountering unknown fields. When
this attribute is not present, by default unknown fields are ignored for
self-describing formats like JSON.</p>
<p><em>Note:</em> this attribute is not supported in combination with <a href="field-attrs.html#flatten"><code>flatten</code></a>,
neither on the outer struct nor on the flattened field.</p>
</li>
</ul>
<ul>
<li><h5 id="tag"><a name="tag" class="plugin-anchor" href="#tag"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(tag = "type")]</code> </h5>
<p>On an enum: Use the internally tagged enum representation, with the given tag.
See <a href="enum-representations.html">enum representations</a> for details on this
representation.</p>
<p>On a struct with named fields: Serialize the struct's name (or value of
<code>serde(rename)</code>) as a field with the given key, in front of all the real
fields of the struct.</p>
</li>
<li><h5 id="tag--content"><a name="tag--content" class="plugin-anchor" href="#tag--content"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(tag = "t", content = "c")]</code> </h5>
<p>Use the adjacently tagged enum representation for this enum, with the given
field names for the tag and content. See <a href="enum-representations.html">enum
representations</a> for details on this representation.</p>
</li>
<li><h5 id="untagged"><a name="untagged" class="plugin-anchor" href="#untagged"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(untagged)]</code> </h5>
<p>Use the untagged enum representation for this enum. See <a href="enum-representations.html">enum
representations</a> for details on this representation.</p>
</li>
<li><h5 id="bound"><a name="bound" class="plugin-anchor" href="#bound"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(bound = "T: MyTrait")]</code> </h5>
<p>Where-clause for the <code>Serialize</code> and <code>Deserialize</code> impls. This replaces any
trait bounds inferred by Serde.</p>
<p>Allows specifying independent bounds for serialization vs deserialization:</p>
<ul>
<li><code>#[serde(bound(serialize = "T: MySerTrait"))]</code></li>
<li><code>#[serde(bound(deserialize = "T: MyDeTrait"))]</code></li>
<li><code>#[serde(bound(serialize = "T: MySerTrait", deserialize = "T: MyDeTrait"))]</code></li>
</ul>
</li>
<li><h5 id="default"><a name="default" class="plugin-anchor" href="#default"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(default)]</code> </h5>
<p>When deserializing, any missing fields should be filled in from the struct's
implementation of <code>Default</code>. Only allowed on structs.</p>
</li>
<li><h5 id="default--path"><a name="default--path" class="plugin-anchor" href="#default--path"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(default = "path")]</code> </h5>
<p>When deserializing, any missing fields should be filled in from the object
returned by the given function or method. The function must be callable as
<code>fn() -> T</code>. For example <code>default = "my_default"</code> would invoke <code>my_default()</code>
and <code>default = "SomeTrait::some_default"</code> would invoke
<code>SomeTrait::some_default()</code>. Only allowed on structs.</p>
</li>
<li><h5 id="remote"><a name="remote" class="plugin-anchor" href="#remote"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(remote = "...")]</code> </h5>
<p>This is used for deriving <code>Serialize</code> and <code>Deserialize</code> for <a href="remote-derive.html">remote
types</a>.</p>
</li>
<li><h5 id="transparent"><a name="transparent" class="plugin-anchor" href="#transparent"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(transparent)]</code> </h5>
<p>Serialize and deserialize a newtype struct or a braced struct with one field
exactly the same as if its one field were serialized and deserialized by
itself. Analogous to <code>#[repr(transparent)]</code>.</p>
</li>
<li><h5 id="from"><a name="from" class="plugin-anchor" href="#from"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(from = "FromType")]</code> </h5>
<p>Deserialize this type by deserializing into <code>FromType</code>, then converting. This
type must implement <code>From<FromType></code>, and <code>FromType</code> must implement
<code>Deserialize</code>.</p>
</li>
<li><h5 id="try_from"><a name="try_from" class="plugin-anchor" href="#try_from"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(try_from = "FromType")]</code> </h5>
<p>Deserialize this type by deserializing into <code>FromType</code>, then converting
fallibly. This type must implement <code>TryFrom<FromType></code> with an error type that
implements <code>Display</code>, and <code>FromType</code> must implement <code>Deserialize</code>.</p>
</li>
<li><h5 id="into"><a name="into" class="plugin-anchor" href="#into"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(into = "IntoType")]</code> </h5>
<p>Serialize this type by converting it into the specified <code>IntoType</code> and
serializing that. This type must implement <code>Clone</code> and <code>Into<IntoType></code>, and
<code>IntoType</code> must implement <code>Serialize</code>.</p>
</li>
<li><h5 id="crate"><a name="crate" class="plugin-anchor" href="#crate"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(crate = "...")]</code> </h5>
<p>Specify a path to the <code>serde</code> crate instance to use when referring to Serde
APIs from generated code. This is normally only applicable when invoking
re-exported Serde derives from a public macro in a different crate.</p>
</li>
<li><h5 id="expecting"><a name="expecting" class="plugin-anchor" href="#expecting"><i class="fa fa-link" aria-hidden="true"></i></a><code>#[serde(expecting = "...")]</code> </h5>
<p>Specify a custom type expectation text for deserialization error messages.
This is used by the generated <code>expecting</code> method for the container <code>Visitor</code>,
and as a fallthrough error message for untagged enums.</p>
</li>
</ul>
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