diff --git a/crates/swc_ecma_codegen/src/config.rs b/crates/swc_ecma_codegen/src/config.rs
index 90ff3f84d48..431028297c0 100644
--- a/crates/swc_ecma_codegen/src/config.rs
+++ b/crates/swc_ecma_codegen/src/config.rs
@@ -36,6 +36,9 @@ pub struct Config {
 
     #[cfg_attr(feature = "serde-impl", serde(default))]
     pub emit_assert_for_import_attributes: bool,
+
+    #[cfg_attr(feature = "serde-impl", serde(default))]
+    pub inline_script: bool,
 }
 
 impl Default for Config {
@@ -46,6 +49,7 @@ impl Default for Config {
             ascii_only: false,
             omit_last_semi: false,
             emit_assert_for_import_attributes: false,
+            inline_script: false,
         }
     }
 }
@@ -78,4 +82,9 @@ impl Config {
         self.emit_assert_for_import_attributes = emit_assert_for_import_attributes;
         self
     }
+
+    pub fn with_inline_script(mut self, inline_script: bool) -> Self {
+        self.inline_script = inline_script;
+        self
+    }
 }
diff --git a/crates/swc_ecma_codegen/src/lib.rs b/crates/swc_ecma_codegen/src/lib.rs
index b09cf941f02..c4d33bb4709 100644
--- a/crates/swc_ecma_codegen/src/lib.rs
+++ b/crates/swc_ecma_codegen/src/lib.rs
@@ -75,6 +75,56 @@ where
     pub wr: W,
 }
 
+fn replace_close_inline_script(raw: &str) -> Cow<str> {
+    let chars = raw.as_bytes();
+    let pattern_len = 8; // </script>
+    let matched = |i: usize| {
+        if i + pattern_len >= chars.len() {
+            return false;
+        }
+        chars[i] == b'<'
+            && chars[i + 1] == b'/'
+            && (chars[i + 2] == b's' || chars[i + 2] == b'S')
+            && (chars[i + 3] == b'c' || chars[i + 3] == b'C')
+            && (chars[i + 4] == b'r' || chars[i + 4] == b'R')
+            && (chars[i + 5] == b'i' || chars[i + 5] == b'I')
+            && (chars[i + 6] == b'p' || chars[i + 6] == b'P')
+            && (chars[i + 7] == b't' || chars[i + 7] == b'T')
+            && (chars[i + 8] == b'>'
+                || chars[i + 8] == b' '
+                || chars[i + 8] == b'\t'
+                || chars[i + 8] == b'\n'
+                || chars[i + 8] == b'\x0C'
+                || chars[i + 8] == b'\r')
+    };
+    let mut matched_list = (0..chars.len()).filter(|&i| matched(i)).peekable();
+    if matched_list.peek().is_none() {
+        return Cow::Borrowed(raw);
+    }
+    let mut result = String::new();
+    let mut last_end = 0;
+    for start in matched_list {
+        for c in unsafe { chars.get_unchecked(last_end..start) } {
+            result.push(*c as char);
+        }
+        for (index, c) in unsafe { chars.get_unchecked(start..start + pattern_len) }
+            .iter()
+            .enumerate()
+        {
+            if index == 1 {
+                // "</s" -> <\/s"
+                result.push('\\');
+            }
+            result.push(*c as char);
+        }
+        last_end = start + pattern_len;
+    }
+    for c in unsafe { chars.get_unchecked(last_end..chars.len()) } {
+        result.push(*c as char);
+    }
+    Cow::Owned(result)
+}
+
 impl<'a, W, S: SourceMapper> Emitter<'a, W, S>
 where
     W: WriteJs,
@@ -579,7 +629,13 @@ where
             }
         }
 
-        let value = get_quoted_utf16(&node.value, self.cfg.ascii_only, target);
+        let mut value = get_quoted_utf16(&node.value, self.cfg.ascii_only, target);
+
+        if self.cfg.inline_script {
+            value = replace_close_inline_script(&value)
+                .replace("\x3c!--", "\\x3c!--")
+                .replace("/--\x3e/", "--\\x3e");
+        }
 
         self.wr.write_str_lit(DUMMY_SP, &value)?;
 
diff --git a/crates/swc_ecma_minifier/src/js.rs b/crates/swc_ecma_minifier/src/js.rs
index eaf933d1ce4..1db01f61304 100644
--- a/crates/swc_ecma_minifier/src/js.rs
+++ b/crates/swc_ecma_minifier/src/js.rs
@@ -130,8 +130,7 @@ pub struct JsMinifyFormatOptions {
     #[serde(default, alias = "indent_start")]
     pub indent_start: bool,
 
-    /// Not implemented yet.
-    #[serde(default, alias = "inline_script")]
+    #[serde(default = "true_by_default", alias = "inline_script")]
     pub inline_script: bool,
 
     /// Not implemented yet.
diff --git a/crates/swc_ecma_minifier/tests/format.rs b/crates/swc_ecma_minifier/tests/format.rs
new file mode 100644
index 00000000000..21baa765c69
--- /dev/null
+++ b/crates/swc_ecma_minifier/tests/format.rs
@@ -0,0 +1,84 @@
+use swc_common::{sync::Lrc, FileName, Mark, SourceMap};
+use swc_ecma_ast::*;
+use swc_ecma_codegen::{
+    text_writer::{omit_trailing_semi, JsWriter, WriteJs},
+    Config, Emitter,
+};
+use swc_ecma_minifier::{optimize, option::ExtraOptions};
+use swc_ecma_parser::{parse_file_as_module, Syntax};
+use testing::NormalizedOutput;
+
+fn print(cm: Lrc<SourceMap>, m: &Module, config: Config) -> String {
+    let mut buf = vec![];
+
+    {
+        let mut wr = Box::new(JsWriter::new(cm.clone(), "\n", &mut buf, None)) as Box<dyn WriteJs>;
+
+        if config.minify {
+            wr = Box::new(omit_trailing_semi(wr));
+        }
+
+        let mut emitter = Emitter {
+            cfg: config,
+            cm,
+            comments: None,
+            wr,
+        };
+
+        emitter.emit_module(m).unwrap();
+    }
+
+    String::from_utf8(buf).unwrap()
+}
+
+fn assert_format(src: &str, expected: &str, opts: Config) {
+    testing::run_test2(false, |cm, _| {
+        let fm = cm.new_source_file(FileName::Anon, src.into());
+
+        let program = parse_file_as_module(
+            &fm,
+            Syntax::Es(Default::default()),
+            Default::default(),
+            None,
+            &mut vec![],
+        )
+        .unwrap();
+
+        let unresolved_mark = Mark::new();
+        let top_level_mark = Mark::new();
+
+        let m = optimize(
+            program.into(),
+            cm.clone(),
+            None,
+            None,
+            &Default::default(),
+            &ExtraOptions {
+                unresolved_mark,
+                top_level_mark,
+            },
+        )
+        .expect_module();
+
+        let actual = print(cm, &m, opts);
+        assert_eq!(
+            NormalizedOutput::from(actual),
+            NormalizedOutput::from(expected.to_owned())
+        );
+        Ok(())
+    })
+    .unwrap()
+}
+
+#[test]
+fn inline_script() {
+    let src = r#"
+console.log("</sCrIpT>");
+"#;
+    let expected = r#"console.log("<\/sCrIpT>");"#;
+    assert_format(
+        src,
+        expected,
+        Config::default().with_inline_script(true).with_minify(true),
+    )
+}