diff --git a/crates/oxc_transformer/src/react_jsx/mod.rs b/crates/oxc_transformer/src/react_jsx/mod.rs
index 3ad5edb16..86447172f 100644
--- a/crates/oxc_transformer/src/react_jsx/mod.rs
+++ b/crates/oxc_transformer/src/react_jsx/mod.rs
@@ -8,7 +8,7 @@ use oxc_diagnostics::{
     miette::{self, Diagnostic},
     thiserror::Error,
 };
-use oxc_span::{Atom, Span, SPAN};
+use oxc_span::{Atom, GetSpan, Span, SPAN};
 use oxc_syntax::{
     identifier::{is_irregular_whitespace, is_line_terminator},
     xml_entities::XML_ENTITIES,
@@ -27,6 +27,11 @@ struct PragmaAndPragmaFragCannotBeSet;
 #[diagnostic(severity(warning))]
 struct NamespaceDoesNotSupport(#[label] Span);
 
+#[derive(Debug, Error, Diagnostic)]
+#[error("Please provide an explicit key value. Using \"key\" as a shorthand for \"key={{true}}\" is not allowed.")]
+#[diagnostic(severity(warning))]
+struct ValuelessKey(#[label] Span);
+
 /// Transform React JSX
 ///
 /// References:
@@ -43,7 +48,6 @@ pub struct ReactJsx<'a> {
     import_fragment: bool,
     import_create_element: bool,
     require_jsx_runtime: bool,
-    // Will be store jsx runtime importer, like `react/jsx-runtime`
     jsx_runtime_importer: Atom,
 }
 
@@ -335,11 +339,14 @@ impl<'a> ReactJsx<'a> {
                         }
                     }
                 }
-                // In automatic mode, extract the key before spread prop,
-                // and add it to the third argument later.
-                if is_automatic && !has_key_after_props_spread {
-                    if let JSXAttributeItem::Attribute(attr) = attribute {
-                        if attr.is_key() {
+                if let JSXAttributeItem::Attribute(attr) = attribute {
+                    if attr.is_key() {
+                        if attr.value.is_none() {
+                            self.ctx.error(ValuelessKey(attr.name.span()));
+                        }
+                        // In automatic mode, extract the key before spread prop,
+                        // and add it to the third argument later.
+                        if is_automatic && !has_key_after_props_spread {
                             key_prop = attr.value.as_ref();
                             continue;
                         }
diff --git a/tasks/transform_conformance/babel.snap.md b/tasks/transform_conformance/babel.snap.md
index 9f20b3eb5..e1a0844ad 100644
--- a/tasks/transform_conformance/babel.snap.md
+++ b/tasks/transform_conformance/babel.snap.md
@@ -1,4 +1,4 @@
-Passed: 271/1113
+Passed: 273/1113
 
 # All Passed:
 * babel-plugin-transform-numeric-separator
@@ -852,7 +852,7 @@ Passed: 271/1113
 * regression/11061/input.mjs
 * variable-declaration/non-null-in-optional-chain/input.ts
 
-# babel-plugin-transform-react-jsx (136/170)
+# babel-plugin-transform-react-jsx (138/170)
 * autoImport/after-polyfills-compiled-to-cjs/input.mjs
 * autoImport/complicated-scope-module/input.js
 * react/adds-appropriate-newlines-when-using-spread-attribute-babel-7/input.js
@@ -864,7 +864,6 @@ Passed: 271/1113
 * react/optimisation.react.constant-elements/input.js
 * react/should-add-quotes-es3/input.js
 * react/should-disallow-spread-children/input.js
-* react/should-disallow-valueless-key/input.js
 * react/should-warn-when-importSource-is-set/input.js
 * react/should-warn-when-importSource-pragma-is-set/input.js
 * react/wraps-props-in-react-spread-for-first-spread-attributes-babel-7/input.js
@@ -874,7 +873,6 @@ Passed: 271/1113
 * react-automatic/optimisation.react.constant-elements/input.js
 * react-automatic/should-add-quotes-es3/input.js
 * react-automatic/should-disallow-spread-children/input.js
-* react-automatic/should-disallow-valueless-key/input.js
 * react-automatic/should-handle-attributed-elements/input.js
 * react-automatic/should-throw-when-filter-is-specified/input.js
 * regression/issue-12478-automatic/input.js