diff --git a/Cargo.lock b/Cargo.lock
index 9900c5e..696b033 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,19 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+dependencies = [
+ "cfg-if 1.0.0",
+ "getrandom",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.75"
@@ -41,6 +54,36 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "deranged"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b42b6fa04a440b495c8b04d0e71b707c585f83cb9cb28cf8cd0d976c315e31b4"
+dependencies = [
+ "powerfmt",
+]
+
+[[package]]
+name = "gethostname"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1ebd34e35c46e00bb73e81363248d627782724609fe1b6396f553f68fe3862e"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "global"
 version = "0.4.3"
@@ -50,6 +93,12 @@ dependencies = [
  "parking_lot",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+
 [[package]]
 name = "js-sys"
 version = "0.3.60"
@@ -67,9 +116,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
 [[package]]
 name = "lock_api"
@@ -133,6 +182,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "num-conv"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+
 [[package]]
 name = "once_cell"
 version = "1.18.0"
@@ -177,6 +232,12 @@ version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
 
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.69"
@@ -234,6 +295,12 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
+
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -255,6 +322,37 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
+[[package]]
+name = "serde"
+version = "1.0.193"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25dd9975e68d0cb5aa1120c288333fc98731bd1dd12f561e468ea4728c042b89"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.193"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43576ca501357b9b071ac53cdc7da8ef0cbd9493d8df094cd821777ea6e894d3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb0652c533506ad7a2e353cce269330d6afd8bdfb6d75e0ace5b35aacbd7b9e9"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -289,6 +387,8 @@ dependencies = [
  "nom",
  "thiserror",
  "tracing",
+ "tracing-bunyan-formatter",
+ "tracing-log 0.2.0",
  "tracing-subscriber",
  "whoami",
 ]
@@ -345,12 +445,44 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5dfd88e563464686c916c7e46e623e520ddc6d79fa6641390f2e3fa86e83e885"
+dependencies = [
+ "deranged",
+ "itoa",
+ "num-conv",
+ "powerfmt",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef927ca75afb808a4d64dd374f00a2adf8d0fcff8e7b184af886c3c87ec4a3f3"
+
+[[package]]
+name = "time-macros"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f252a68540fde3a3877aeea552b832b40ab9a69e318efd078774a01ddee1ccf"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
+
 [[package]]
 name = "tracing"
 version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
+ "log",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
@@ -367,6 +499,24 @@ dependencies = [
  "syn 2.0.38",
 ]
 
+[[package]]
+name = "tracing-bunyan-formatter"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5c266b9ac83dedf0e0385ad78514949e6d89491269e7065bee51d2bb8ec7373"
+dependencies = [
+ "ahash",
+ "gethostname",
+ "log",
+ "serde",
+ "serde_json",
+ "time",
+ "tracing",
+ "tracing-core",
+ "tracing-log 0.1.4",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.32"
@@ -377,6 +527,17 @@ dependencies = [
  "valuable",
 ]
 
+[[package]]
+name = "tracing-log"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f751112709b4e791d8ce53e32c4ed2d353565a795ce84da2285393f41557bdf2"
+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
 [[package]]
 name = "tracing-log"
 version = "0.2.0"
@@ -403,7 +564,7 @@ dependencies = [
  "thread_local",
  "tracing",
  "tracing-core",
- "tracing-log",
+ "tracing-log 0.2.0",
 ]
 
 [[package]]
@@ -418,6 +579,18 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.83"
@@ -513,3 +686,23 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.38",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 4261579..c7998fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,13 @@ name = "star-kirby-lang"
 version = "0.1.1"
 edition = "2021"
 
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+name = "star-kirby-lang"
+path = "src/main.rs"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
@@ -13,4 +20,9 @@ global = "0.4.3"
 thiserror = "1.0.50"
 nom = "7.1.3"
 tracing = "0.1.40"
-tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
+tracing-subscriber = { version = "0.3.18", features = [
+    "env-filter",
+    "registry",
+] }
+tracing-bunyan-formatter = "0.3.9"
+tracing-log = "0.2.0"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..97f552a
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,13 @@
+#[macro_use]
+extern crate lazy_static;
+extern crate core;
+
+pub mod ast;
+pub mod error;
+pub mod evaluator;
+pub mod lexer;
+pub mod object;
+pub mod parser;
+pub mod repl;
+pub mod telemetry;
+pub mod token;
diff --git a/src/main.rs b/src/main.rs
index 58011ba..03d0a5b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,20 +1,11 @@
-#[macro_use]
-extern crate lazy_static;
-extern crate core;
-
+use star_kirby_lang::repl;
+use star_kirby_lang::telemetry;
 use std::io;
 
-pub mod ast;
-pub mod error;
-pub mod evaluator;
-pub mod lexer;
-pub mod object;
-pub mod parser;
-pub mod repl;
-pub mod token;
-
 fn main() -> anyhow::Result<()> {
-    tracing_subscriber::fmt::init();
+    let subscriber =
+        telemetry::get_subscriber("star-kirby-lang".into(), "info".into(), std::io::stdout);
+    telemetry::init_subscriber(subscriber)?;
     println!(
         "Hello {}! This is the Monkey programming language!",
         whoami::username()
diff --git a/src/telemetry.rs b/src/telemetry.rs
new file mode 100644
index 0000000..da446b9
--- /dev/null
+++ b/src/telemetry.rs
@@ -0,0 +1,48 @@
+use anyhow::Result;
+use tracing::subscriber::set_global_default;
+use tracing::Subscriber;
+use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
+use tracing_log::LogTracer;
+use tracing_subscriber::fmt::MakeWriter;
+use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};
+
+/// Compose multiple layers into a `tracing`'s subscriber.
+///
+/// # Implementation Notes
+///
+/// We are using `impl Subscriber` as return type to avoid having to
+/// spell out the actual type of the returned subscriber, which is
+/// indeed quite complex.
+/// We need to explicitly call out that the returned subscriber is
+/// `Send` and `Sync` to make it possible to pass it to `init_subscriber`
+/// later on.
+pub fn get_subscriber<Sink>(
+    name: String,
+    env_filter: String,
+    sink: Sink,
+) -> impl Subscriber + Send + Sync
+where
+    // This "weird" syntax is a higher-ranked trait bound (HRTB)
+    // It basically means that Sink implements the `MakeWriter`
+    // trait for all choices of the lifetime parameter `'a`
+    // Check out https://doc.rust-lang.org/nomicon/hrtb.html
+    // for more details.
+    Sink: for<'a> MakeWriter<'a> + Send + Sync + 'static,
+{
+    let env_filter =
+        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter));
+    let formatting_layer = BunyanFormattingLayer::new(name, sink);
+    Registry::default()
+        .with(env_filter)
+        .with(JsonStorageLayer)
+        .with(formatting_layer)
+}
+
+/// Register a subscriber as global default to process span data.
+///
+/// It should only be called once!
+pub fn init_subscriber(subscriber: impl Subscriber + Send + Sync) -> Result<()> {
+    LogTracer::init()?;
+    set_global_default(subscriber)?;
+    Ok(())
+}