diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index a98b59c6181..aef8f1a74fb 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -235,7 +235,7 @@ struct AllTypes {
     traits: FxHashSet<ItemEntry>,
     macros: FxHashSet<ItemEntry>,
     functions: FxHashSet<ItemEntry>,
-    typedefs: FxHashSet<ItemEntry>,
+    type_aliases: FxHashSet<ItemEntry>,
     opaque_tys: FxHashSet<ItemEntry>,
     statics: FxHashSet<ItemEntry>,
     constants: FxHashSet<ItemEntry>,
@@ -255,7 +255,7 @@ impl AllTypes {
             traits: new_set(100),
             macros: new_set(100),
             functions: new_set(100),
-            typedefs: new_set(100),
+            type_aliases: new_set(100),
             opaque_tys: new_set(100),
             statics: new_set(100),
             constants: new_set(100),
@@ -279,7 +279,7 @@ impl AllTypes {
                 ItemType::Trait => self.traits.insert(ItemEntry::new(new_url, name)),
                 ItemType::Macro => self.macros.insert(ItemEntry::new(new_url, name)),
                 ItemType::Function => self.functions.insert(ItemEntry::new(new_url, name)),
-                ItemType::TypeAlias => self.typedefs.insert(ItemEntry::new(new_url, name)),
+                ItemType::TypeAlias => self.type_aliases.insert(ItemEntry::new(new_url, name)),
                 ItemType::OpaqueTy => self.opaque_tys.insert(ItemEntry::new(new_url, name)),
                 ItemType::Static => self.statics.insert(ItemEntry::new(new_url, name)),
                 ItemType::Constant => self.constants.insert(ItemEntry::new(new_url, name)),
@@ -317,7 +317,7 @@ impl AllTypes {
         if !self.functions.is_empty() {
             sections.insert(ItemSection::Functions);
         }
-        if !self.typedefs.is_empty() {
+        if !self.type_aliases.is_empty() {
             sections.insert(ItemSection::TypeAliases);
         }
         if !self.opaque_tys.is_empty() {
@@ -374,7 +374,7 @@ impl AllTypes {
         print_entries(f, &self.attribute_macros, ItemSection::AttributeMacros);
         print_entries(f, &self.derive_macros, ItemSection::DeriveMacros);
         print_entries(f, &self.functions, ItemSection::Functions);
-        print_entries(f, &self.typedefs, ItemSection::TypeAliases);
+        print_entries(f, &self.type_aliases, ItemSection::TypeAliases);
         print_entries(f, &self.trait_aliases, ItemSection::TraitAliases);
         print_entries(f, &self.opaque_tys, ItemSection::OpaqueTypes);
         print_entries(f, &self.statics, ItemSection::Statics);
diff --git a/src/librustdoc/json/conversions.rs b/src/librustdoc/json/conversions.rs
index f857a4c8a49..66b5798797f 100644
--- a/src/librustdoc/json/conversions.rs
+++ b/src/librustdoc/json/conversions.rs
@@ -311,7 +311,7 @@ fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
         ForeignTypeItem => ItemEnum::ForeignType,
-        TypeAliasItem(t) => ItemEnum::Typedef(t.into_tcx(tcx)),
+        TypeAliasItem(t) => ItemEnum::TypeAlias(t.into_tcx(tcx)),
         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
         MacroItem(m) => ItemEnum::Macro(m.source),
@@ -787,10 +787,10 @@ pub(crate) fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind
     }
 }
 
-impl FromWithTcx<Box<clean::TypeAlias>> for Typedef {
-    fn from_tcx(typedef: Box<clean::TypeAlias>, tcx: TyCtxt<'_>) -> Self {
-        let clean::TypeAlias { type_, generics, item_type: _ } = *typedef;
-        Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
+impl FromWithTcx<Box<clean::TypeAlias>> for TypeAlias {
+    fn from_tcx(type_alias: Box<clean::TypeAlias>, tcx: TyCtxt<'_>) -> Self {
+        let clean::TypeAlias { type_, generics, item_type: _ } = *type_alias;
+        TypeAlias { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
     }
 }
 
@@ -827,7 +827,7 @@ impl FromWithTcx<ItemType> for ItemKind {
             Union => ItemKind::Union,
             Enum => ItemKind::Enum,
             Function | TyMethod | Method => ItemKind::Function,
-            TypeAlias => ItemKind::Typedef,
+            TypeAlias => ItemKind::TypeAlias,
             OpaqueTy => ItemKind::OpaqueTy,
             Static => ItemKind::Static,
             Constant => ItemKind::Constant,
diff --git a/src/librustdoc/json/mod.rs b/src/librustdoc/json/mod.rs
index cd791ce000b..27e8a27ba2f 100644
--- a/src/librustdoc/json/mod.rs
+++ b/src/librustdoc/json/mod.rs
@@ -184,7 +184,7 @@ impl<'tcx> FormatRenderer<'tcx> for JsonRenderer<'tcx> {
                 | types::ItemEnum::Variant(_)
                 | types::ItemEnum::TraitAlias(_)
                 | types::ItemEnum::Impl(_)
-                | types::ItemEnum::Typedef(_)
+                | types::ItemEnum::TypeAlias(_)
                 | types::ItemEnum::OpaqueTy(_)
                 | types::ItemEnum::Constant(_)
                 | types::ItemEnum::Static(_)
diff --git a/src/rustdoc-json-types/lib.rs b/src/rustdoc-json-types/lib.rs
index ba8eeaa6682..5d979521885 100644
--- a/src/rustdoc-json-types/lib.rs
+++ b/src/rustdoc-json-types/lib.rs
@@ -8,7 +8,7 @@ use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 
 /// rustdoc format-version.
-pub const FORMAT_VERSION: u32 = 26;
+pub const FORMAT_VERSION: u32 = 27;
 
 /// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
 /// about the language items in the local crate, as well as info about external items to allow
@@ -203,7 +203,7 @@ pub enum ItemKind {
     Enum,
     Variant,
     Function,
-    Typedef,
+    TypeAlias,
     OpaqueTy,
     Constant,
     Trait,
@@ -242,7 +242,7 @@ pub enum ItemEnum {
     TraitAlias(TraitAlias),
     Impl(Impl),
 
-    Typedef(Typedef),
+    TypeAlias(TypeAlias),
     OpaqueTy(OpaqueTy),
     Constant(Constant),
 
@@ -696,7 +696,7 @@ pub enum MacroKind {
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
-pub struct Typedef {
+pub struct TypeAlias {
     #[serde(rename = "type")]
     pub type_: Type,
     pub generics: Generics,
diff --git a/src/tools/jsondoclint/src/item_kind.rs b/src/tools/jsondoclint/src/item_kind.rs
index 45a9c93ee0b..d48e6533a20 100644
--- a/src/tools/jsondoclint/src/item_kind.rs
+++ b/src/tools/jsondoclint/src/item_kind.rs
@@ -148,7 +148,7 @@ impl Kind {
             ItemEnum::Trait(_) => Trait,
             ItemEnum::TraitAlias(_) => TraitAlias,
             ItemEnum::Impl(_) => Impl,
-            ItemEnum::Typedef(_) => Typedef,
+            ItemEnum::TypeAlias(_) => Typedef,
             ItemEnum::OpaqueTy(_) => OpaqueTy,
             ItemEnum::Constant(_) => Constant,
             ItemEnum::Static(_) => Static,
@@ -186,7 +186,7 @@ impl Kind {
             ItemKind::StructField => StructField,
             ItemKind::Trait => Trait,
             ItemKind::TraitAlias => TraitAlias,
-            ItemKind::Typedef => Typedef,
+            ItemKind::TypeAlias => Typedef,
             ItemKind::Union => Union,
             ItemKind::Variant => Variant,
         }
diff --git a/src/tools/jsondoclint/src/validator.rs b/src/tools/jsondoclint/src/validator.rs
index bf8a64acf08..79b1551f301 100644
--- a/src/tools/jsondoclint/src/validator.rs
+++ b/src/tools/jsondoclint/src/validator.rs
@@ -5,7 +5,7 @@ use rustdoc_json_types::{
     Constant, Crate, DynTrait, Enum, FnDecl, Function, FunctionPointer, GenericArg, GenericArgs,
     GenericBound, GenericParamDef, Generics, Id, Impl, Import, ItemEnum, ItemSummary, Module,
     OpaqueTy, Path, Primitive, ProcMacro, Static, Struct, StructKind, Term, Trait, TraitAlias,
-    Type, TypeBinding, TypeBindingKind, Typedef, Union, Variant, VariantKind, WherePredicate,
+    Type, TypeAlias, TypeBinding, TypeBindingKind, Union, Variant, VariantKind, WherePredicate,
 };
 use serde_json::Value;
 
@@ -99,7 +99,7 @@ impl<'a> Validator<'a> {
                 ItemEnum::Trait(x) => self.check_trait(x, id),
                 ItemEnum::TraitAlias(x) => self.check_trait_alias(x),
                 ItemEnum::Impl(x) => self.check_impl(x, id),
-                ItemEnum::Typedef(x) => self.check_typedef(x),
+                ItemEnum::TypeAlias(x) => self.check_typedef(x),
                 ItemEnum::OpaqueTy(x) => self.check_opaque_ty(x),
                 ItemEnum::Constant(x) => self.check_constant(x),
                 ItemEnum::Static(x) => self.check_static(x),
@@ -221,7 +221,7 @@ impl<'a> Validator<'a> {
         }
     }
 
-    fn check_typedef(&mut self, x: &'a Typedef) {
+    fn check_typedef(&mut self, x: &'a TypeAlias) {
         self.check_generics(&x.generics);
         self.check_type(&x.type_);
     }