diff --git a/apps/oxfmt/src/service.rs b/apps/oxfmt/src/service.rs
index 6203580db3e53..9654cbec8bbf1 100644
--- a/apps/oxfmt/src/service.rs
+++ b/apps/oxfmt/src/service.rs
@@ -5,7 +5,7 @@ use rayon::prelude::*;
 
 use oxc_allocator::Allocator;
 use oxc_diagnostics::{DiagnosticSender, DiagnosticService, OxcDiagnostic};
-use oxc_formatter::{FormatOptions, Formatter};
+use oxc_formatter::{FormatOptions, Formatter, enable_jsx_source_type};
 use oxc_parser::{ParseOptions, Parser};
 
 use crate::{command::OutputOptions, walk::WalkEntry};
@@ -45,7 +45,7 @@ impl FormatService {
         let start_time = Instant::now();
 
         let path = Path::new(&entry.path);
-        let source_type = entry.source_type;
+        let source_type = enable_jsx_source_type(entry.source_type);
 
         // TODO: Use `read_to_arena_str()` like `oxlint`?
         let source_text = fs::read_to_string(path).expect("Failed to read file");
diff --git a/crates/oxc_formatter/src/lib.rs b/crates/oxc_formatter/src/lib.rs
index cf1c810f53651..7382c8078a037 100644
--- a/crates/oxc_formatter/src/lib.rs
+++ b/crates/oxc_formatter/src/lib.rs
@@ -35,7 +35,10 @@ use rustc_hash::{FxHashMap, FxHashSet};
 use write::FormatWrite;
 
 pub use crate::options::*;
-pub use crate::service::{oxfmtrc::Oxfmtrc, source_type::get_supported_source_type};
+pub use crate::service::{
+    oxfmtrc::Oxfmtrc,
+    source_type::{enable_jsx_source_type, get_supported_source_type},
+};
 use crate::{
     formatter::{FormatContext, Formatted, format_element::document::Document},
     generated::ast_nodes::{AstNode, AstNodes},
diff --git a/crates/oxc_formatter/src/service/source_type.rs b/crates/oxc_formatter/src/service/source_type.rs
index 5c0617ec95460..9874801d1c717 100644
--- a/crates/oxc_formatter/src/service/source_type.rs
+++ b/crates/oxc_formatter/src/service/source_type.rs
@@ -48,3 +48,23 @@ pub fn get_supported_source_type(path: &std::path::Path) -> Option<SourceType> {
 
     None
 }
+
+#[must_use]
+pub fn enable_jsx_source_type(source_type: SourceType) -> SourceType {
+    if source_type.is_jsx() {
+        return source_type;
+    }
+
+    // Always enable JSX for JavaScript files, no syntax conflict
+    if source_type.is_javascript() {
+        return source_type.with_jsx(true);
+    }
+
+    // Prettier uses `regexp.test(source_text)` to detect JSX in TypeScript files.
+    // But we don't follow it for now, since it hurts the performance.
+    // if source_type.is_typescript() {
+    //   // See https://github.com/prettier/prettier/blob/0d1e7abd5037a1fe8fbcf88a4d8cd13ec4d13a78/src/language-js/parse/utils/jsx-regexp.evaluate.js
+    // }
+
+    source_type
+}
diff --git a/crates/oxc_language_server/src/formatter/server_formatter.rs b/crates/oxc_language_server/src/formatter/server_formatter.rs
index 29a474e119c7d..69a8794ffa66d 100644
--- a/crates/oxc_language_server/src/formatter/server_formatter.rs
+++ b/crates/oxc_language_server/src/formatter/server_formatter.rs
@@ -3,7 +3,9 @@ use std::path::Path;
 use log::warn;
 use oxc_allocator::Allocator;
 use oxc_data_structures::rope::{Rope, get_line_column};
-use oxc_formatter::{FormatOptions, Formatter, Oxfmtrc, get_supported_source_type};
+use oxc_formatter::{
+    FormatOptions, Formatter, Oxfmtrc, enable_jsx_source_type, get_supported_source_type,
+};
 use oxc_parser::{ParseOptions, Parser};
 use tower_lsp_server::{
     UriExt,
@@ -25,7 +27,7 @@ impl ServerFormatter {
 
     pub fn run_single(&self, uri: &Uri, content: Option<String>) -> Option<Vec<TextEdit>> {
         let path = uri.to_file_path()?;
-        let source_type = get_supported_source_type(&path)?;
+        let source_type = get_supported_source_type(&path).map(enable_jsx_source_type)?;
         let source_text = if let Some(content) = content {
             content
         } else {