diff --git a/Cargo.lock b/Cargo.lock
index a928fda..5132e78 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1728,9 +1728,9 @@ dependencies = [
  "fancy-regex",
  "itertools",
  "neon",
+ "serde",
  "serde_json",
  "thiserror",
- "zk-regex-compiler",
 ]
 
 [[package]]
diff --git a/packages/apis/Cargo.toml b/packages/apis/Cargo.toml
index a6d26cc..9aad838 100644
--- a/packages/apis/Cargo.toml
+++ b/packages/apis/Cargo.toml
@@ -17,7 +17,8 @@ crate-type = ["rlib", "cdylib"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-zk-regex-compiler = { path = "../compiler", default-features = false }
+# zk-regex-compiler = { path = "../compiler", default-features = false }
+serde = { version = "1.0.159", features = ["derive"] }
 fancy-regex = "0.11.0"
 itertools = "0.10.3"
 thiserror = "1.0.40"
diff --git a/packages/apis/src/extract_substrs.rs b/packages/apis/src/extract_substrs.rs
index 311a1ed..b73d655 100644
--- a/packages/apis/src/extract_substrs.rs
+++ b/packages/apis/src/extract_substrs.rs
@@ -1,8 +1,28 @@
 use fancy_regex::Regex;
 use neon::prelude::*;
+use serde::{Deserialize, Serialize};
 use serde_json;
 use thiserror::Error;
-use zk_regex_compiler::DecomposedRegexConfig;
+// use zk_regex_compiler::DecomposedRegexConfig;
+
+/// A configuration of decomposed regexes.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DecomposedRegexConfig {
+    pub parts: Vec<RegexPartConfig>,
+}
+
+/// Decomposed regex part.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RegexPartConfig {
+    /// A flag indicating whether the substring matching with `regex_def` should be exposed.
+    pub is_public: bool,
+    /// A regex string.
+    pub regex_def: String,
+    // Maximum byte size of the substring in this part.
+    // pub max_size: usize,
+    // (Optional) A solidity type of the substring in this part, e.g., "String", "Int", "Decimal".
+    // pub solidity: Option<SoldityType>,
+}
 
 /// Error definitions of the compiler.
 #[derive(Error, Debug)]
@@ -374,8 +394,6 @@ pub fn extract_message_id_idxes_node(mut cx: FunctionContext) -> JsResult<JsArra
 
 #[cfg(test)]
 mod test {
-    use zk_regex_compiler::RegexPartConfig;
-
     use super::*;
 
     #[test]
diff --git a/packages/compiler/src/lib.rs b/packages/compiler/src/lib.rs
index 7331a64..7f46f6e 100644
--- a/packages/compiler/src/lib.rs
+++ b/packages/compiler/src/lib.rs
@@ -38,9 +38,6 @@ pub enum CompilerError {
 /// A configuration of decomposed regexes.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct DecomposedRegexConfig {
-    /// Maximum byte size of the input string.
-    // pub max_byte_size: usize,
-    /// A vector of decomposed regexes.
     pub parts: Vec<RegexPartConfig>,
 }