diff --git a/Cargo.lock b/Cargo.lock
index d8623061..2f9dc24e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -301,6 +301,26 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "console_error_panic_hook"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06aeb73f470f66dcdbf7223caeebb85984942f22f1adb2a088cf9668146bbbc"
+dependencies = [
+ "cfg-if 1.0.0",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "console_log"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be8aed40e4edbf4d3b4431ab260b63fdc40f5780a4766824329ea0f1eefe3c0f"
+dependencies = [
+ "log",
+ "web-sys",
+]
+
 [[package]]
 name = "cookie"
 version = "0.12.0"
@@ -882,10 +902,11 @@ checksum = "112c678d4050afce233f4f2852bb2eb519230b3cf12f33585275537d7e41578d"
 
 [[package]]
 name = "js-sys"
-version = "0.3.58"
+version = "0.3.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3fac17f7123a73ca62df411b1bf727ccc805daa070338fda671c86dac1bdc27"
+checksum = "1cfaf33c695fc6e08064efbc1f72ec937429614f25eef83af942d0e227c3a28f"
 dependencies = [
+ "once_cell",
  "wasm-bindgen",
 ]
 
@@ -1033,6 +1054,16 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "minicov"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27fe9f1cc3c22e1687f9446c2083c4c5fc7f0bcf1c7a86bdbded14985895b4b"
+dependencies = [
+ "cc",
+ "walkdir",
+]
+
 [[package]]
 name = "minimal-lexical"
 version = "0.2.1"
@@ -1713,12 +1744,27 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eded382c5f5f786b989652c49544c4877d9f015cc22e145a5ea8ea66c2921cd2"
+
 [[package]]
 name = "ryu"
 version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3f6f92acf49d1b98f7a81226834412ada05458b7364277387724a237f062695"
 
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "schannel"
 version = "0.1.20"
@@ -1782,6 +1828,17 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-wasm-bindgen"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8302e169f0eddcc139c70f139d19d6467353af16f9fce27e8c30158036a1e16b"
+dependencies = [
+ "js-sys",
+ "serde",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.219"
@@ -2001,6 +2058,24 @@ dependencies = [
  "squawk_parser",
 ]
 
+[[package]]
+name = "squawk_wasm"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "console_log",
+ "line-index",
+ "log",
+ "serde",
+ "serde-wasm-bindgen",
+ "squawk_lexer",
+ "squawk_linter",
+ "squawk_syntax",
+ "wasm-bindgen",
+ "wasm-bindgen-test",
+ "web-sys",
+]
+
 [[package]]
 name = "string"
 version = "0.2.1"
@@ -2369,9 +2444,9 @@ checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.1"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
 [[package]]
 name = "unicode-normalization"
@@ -2456,6 +2531,16 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "walkdir"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
+dependencies = [
+ "same-file",
+ "winapi-util",
+]
+
 [[package]]
 name = "want"
 version = "0.2.0"
@@ -2475,34 +2560,48 @@ checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.81"
+version = "0.2.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c53b543413a17a202f4be280a7e5c62a1c69345f5de525ee64f8cfdbc954994"
+checksum = "1edc8929d7499fc4e8f0be2262a241556cfc54a0bea223790e71446f2aab1ef5"
 dependencies = [
  "cfg-if 1.0.0",
+ "once_cell",
+ "rustversion",
  "wasm-bindgen-macro",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.81"
+version = "0.2.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
+checksum = "2f0a0651a5c2bc21487bde11ee802ccaf4c51935d0d3d42a6101f98161700bc6"
 dependencies = [
  "bumpalo",
- "lazy_static",
  "log",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.101",
  "wasm-bindgen-shared",
 ]
 
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "555d470ec0bc3bb57890405e5d4322cc9ea83cebb085523ced7be4144dac1e61"
+dependencies = [
+ "cfg-if 1.0.0",
+ "js-sys",
+ "once_cell",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.81"
+version = "0.2.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c441e177922bc58f1e12c022624b6216378e5febc2f0533e41ba443d505b80aa"
+checksum = "7fe63fc6d09ed3792bd0897b314f53de8e16568c2b3f7982f468c0bf9bd0b407"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -2510,28 +2609,55 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.81"
+version = "0.2.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d94ac45fcf608c1f45ef53e748d35660f168490c10b23704c7779ab8f5c3048"
+checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.101",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.81"
+version = "0.2.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a05d73b933a847d6cccdda8f838a22ff101ad9bf93e33684f39c1f5f0eece3d"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "wasm-bindgen-test"
+version = "0.3.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
+checksum = "66c8d5e33ca3b6d9fa3b4676d774c5778031d27a578c2b007f905acf816152c3"
+dependencies = [
+ "js-sys",
+ "minicov",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "wasm-bindgen-test-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-test-macro"
+version = "0.3.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17d5042cc5fa009658f9a7333ef24291b1291a25b6382dd68862a7f3b969f69b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.101",
+]
 
 [[package]]
 name = "web-sys"
-version = "0.3.58"
+version = "0.3.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
+checksum = "33b6dd2ef9186f1f2072e409e99cd22a975331a6b3591b12c764e0e55c60d5d2"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
diff --git a/Cargo.toml b/Cargo.toml
index 163f4247..1af1f798 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,12 @@ rowan = "0.15.15"
 smol_str = "0.3.2"
 enum-iterator = "2.1.0"
 line-index = "0.1.2"
+serde-wasm-bindgen = "0.6.5"
+wasm-bindgen = "0.2.100"
+wasm-bindgen-test = "0.3.34"
+web-sys = "0.3.77"
+console_error_panic_hook = "0.1.7"
+console_log = "1.0.0"
 
 # local
 squawk-parser = { version = "0.0.0", path = "./crates/parser" }
@@ -44,6 +50,7 @@ squawk-github = { version = "0.0.0", path = "./crates/github" }
 squawk_lexer = { version = "0.0.0", path = "./crates/squawk_lexer" }
 squawk_parser = { version = "0.0.0", path = "./crates/squawk_parser" }
 squawk_syntax = { version = "0.0.0", path = "./crates/squawk_syntax" }
+squawk_linter = { version = "0.0.0", path = "./crates/squawk_linter" }
 
 [workspace.lints.clippy]
 collapsible_else_if = "allow"
diff --git a/crates/squawk_wasm/Cargo.toml b/crates/squawk_wasm/Cargo.toml
new file mode 100644
index 00000000..18685497
--- /dev/null
+++ b/crates/squawk_wasm/Cargo.toml
@@ -0,0 +1,34 @@
+[package]
+name = "squawk_wasm"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+
+squawk_syntax.workspace = true
+squawk_linter.workspace = true
+squawk_lexer.workspace = true
+
+wasm-bindgen.workspace = true
+serde-wasm-bindgen.workspace = true
+serde.workspace = true
+console_error_panic_hook = { workspace = true, optional = true }
+web-sys = { workspace = true, features = ["Window"] }
+console_log.workspace = true
+log.workspace = true
+line-index.workspace = true
+
+[dev-dependencies]
+wasm-bindgen-test.workspace = true
+
+[lints]
+workspace = true
diff --git a/crates/squawk_wasm/README.md b/crates/squawk_wasm/README.md
new file mode 100644
index 00000000..8d108544
--- /dev/null
+++ b/crates/squawk_wasm/README.md
@@ -0,0 +1,5 @@
+# squak_wasm
+
+```shell
+wasm-pack build --target web crates/squawk_wasm
+```
diff --git a/crates/squawk_wasm/src/lib.rs b/crates/squawk_wasm/src/lib.rs
new file mode 100644
index 00000000..dc67d7c5
--- /dev/null
+++ b/crates/squawk_wasm/src/lib.rs
@@ -0,0 +1,136 @@
+use line_index::LineIndex;
+use log::info;
+use serde::Serialize;
+use wasm_bindgen::prelude::*;
+use web_sys::js_sys::Error;
+
+#[wasm_bindgen(start)]
+pub fn run() {
+    use log::Level;
+
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+    console_log::init_with_level(Level::Debug).expect("Initializing logger went wrong.");
+    info!("init!");
+}
+
+#[wasm_bindgen]
+pub fn dump_cst(text: String) -> String {
+    let parse = squawk_syntax::SourceFile::parse(&text);
+    format!("{:#?}", parse.syntax_node())
+}
+
+#[wasm_bindgen]
+pub fn dump_tokens(text: String) -> String {
+    let tokens = squawk_lexer::tokenize(&text);
+    let mut start = 0;
+    let mut out = String::new();
+    for token in tokens {
+        let end = start + token.len;
+        let content = &text[start as usize..(end) as usize];
+        out += &format!("{:?}@{start}..{end} {:?}\n", token.kind, content);
+        start += token.len;
+    }
+    out
+}
+
+#[allow(dead_code)]
+#[derive(Serialize)]
+enum Severity {
+    Hint,
+    Info,
+    Warning,
+    Error,
+}
+
+#[derive(Serialize)]
+struct LintError {
+    severity: Severity,
+    code: String,
+    message: String,
+    start_line_number: u32,
+    start_column: u32,
+    end_line_number: u32,
+    end_column: u32,
+    // used for the linter tab
+    range_start: usize,
+    // used for the linter tab
+    range_end: usize,
+    // used for the linter tab
+    messages: Vec<String>,
+}
+
+#[wasm_bindgen]
+pub fn lint(text: String) -> Result<JsValue, Error> {
+    let mut linter = squawk_linter::Linter::with_all_rules();
+    let parse = squawk_syntax::SourceFile::parse(&text);
+    let parse_errors = parse.errors();
+
+    let line_index = LineIndex::new(&text);
+
+    // TODO: chain these with other stuff
+    let parse_errors = parse_errors.iter().map(|x| {
+        let range_start = x.range().start();
+        let range_end = x.range().end();
+        let start = line_index.line_col(range_start);
+        let end = line_index.line_col(range_end);
+        let start = line_index
+            .to_wide(line_index::WideEncoding::Utf16, start)
+            .unwrap();
+        let end = line_index
+            .to_wide(line_index::WideEncoding::Utf16, end)
+            .unwrap();
+        LintError {
+            severity: Severity::Error,
+            code: "syntax-error".to_string(),
+            message: x.message().to_string(),
+            start_line_number: start.line,
+            start_column: start.col,
+            end_line_number: end.line,
+            end_column: end.col,
+            range_start: range_start.into(),
+            range_end: range_end.into(),
+            messages: vec![],
+        }
+    });
+
+    let lint_errors = linter.lint(parse, &text);
+    let errors = lint_errors.into_iter().map(|x| {
+        let start = line_index.line_col(x.text_range.start());
+        let end = line_index.line_col(x.text_range.end());
+        let start = line_index
+            .to_wide(line_index::WideEncoding::Utf16, start)
+            .unwrap();
+        let end = line_index
+            .to_wide(line_index::WideEncoding::Utf16, end)
+            .unwrap();
+        LintError {
+            code: x.code.to_string(),
+            range_start: x.text_range.start().into(),
+            range_end: x.text_range.end().into(),
+            message: x.message.clone(),
+            messages: x.messages.clone(),
+            // parser errors should be error
+            severity: Severity::Warning,
+            start_line_number: start.line,
+            start_column: start.col,
+            end_line_number: end.line,
+            end_column: end.col,
+        }
+    });
+
+    let mut errors_to_dump = errors.chain(parse_errors).collect::<Vec<_>>();
+    errors_to_dump.sort_by_key(|k| (k.start_line_number, k.start_column));
+
+    serde_wasm_bindgen::to_value(&errors_to_dump).map_err(into_error)
+}
+
+fn into_error<E: std::fmt::Display>(err: E) -> Error {
+    Error::new(&err.to_string())
+}