diff --git a/Cargo.lock b/Cargo.lock
index bf50719..a5eb0bf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -172,6 +172,15 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "cc"
+version = "1.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c3d1b2e905a3a7b00a6141adb0e4c0bb941d11caf55349d863942a1cc44e3c9"
+dependencies = [
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -287,6 +296,7 @@ dependencies = [
  "cql2",
  "getrandom",
  "wasm-bindgen",
+ "wasm-bindgen-test",
  "web-sys",
 ]
 
@@ -960,6 +970,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "minicov"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27fe9f1cc3c22e1687f9446c2083c4c5fc7f0bcf1c7a86bdbded14985895b4b"
+dependencies = [
+ "cc",
+ "walkdir",
+]
+
 [[package]]
 name = "num"
 version = "0.4.3"
@@ -1485,6 +1505,15 @@ version = "1.0.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ea1a2d0a644769cc99faa24c3ad26b379b786fe7c36fd3c546254801650e6dd"
 
+[[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 = "scopeguard"
 version = "1.2.0"
@@ -1541,6 +1570,12 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "siphasher"
 version = "1.0.1"
@@ -1785,6 +1820,16 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c3082ca00d5a5ef149bb8b555a72ae84c9c59f7250f013ac822ac2e49b19c64"
 
+[[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 = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1817,6 +1862,19 @@ dependencies = [
  "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",
+ "js-sys",
+ "once_cell",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.100"
@@ -1849,6 +1907,30 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "wasm-bindgen-test"
+version = "0.3.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+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",
+]
+
 [[package]]
 name = "web-sys"
 version = "0.3.77"
@@ -1859,6 +1941,15 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "winapi-util"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
diff --git a/Cargo.toml b/Cargo.toml
index 2998f17..1621842 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,3 +53,6 @@ members = ["cli", "python", "wasm"]
 
 [workspace.dependencies]
 clap = "4.5.28"
+
+[profile.release]
+opt-level = "s"
diff --git a/wasm/Cargo.toml b/wasm/Cargo.toml
index aa96721..e072a8e 100644
--- a/wasm/Cargo.toml
+++ b/wasm/Cargo.toml
@@ -12,7 +12,7 @@ keywords = ["cql2"]
 publish = false
 
 [lib]
-crate-type = ["cdylib"]
+crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 cql2 = { path = ".." }
@@ -22,3 +22,6 @@ getrandom = { version = "0.2.15", features = ["js"] }
 [dependencies.web-sys]
 version = "0.3.4"
 features = ['Document', 'Element', 'HtmlElement', 'Node', 'Window']
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
diff --git a/wasm/LICENSE b/wasm/LICENSE
new file mode 120000
index 0000000..ea5b606
--- /dev/null
+++ b/wasm/LICENSE
@@ -0,0 +1 @@
+../LICENSE
\ No newline at end of file
diff --git a/wasm/README.md b/wasm/README.md
index 98cc0ce..d8041a3 100644
--- a/wasm/README.md
+++ b/wasm/README.md
@@ -21,3 +21,18 @@ uv run mkdocs serve
 
 The playground will be available at <http://127.0.0.1:8000/cql2-rs/playground/>.
 There is a live version available at <http://developmentseed.org/cql2-rs/latest/playground/>.
+
+## Testing
+
+```shell
+wasm-pack test --firefox wasm
+```
+
+Then, open <http://127.0.0.1:8000/> to see the test(s) run.
+
+## Releasing to NPM
+
+```shell
+wasm-pack build wasm
+# TODO actually release
+```
diff --git a/wasm/tests/web.rs b/wasm/tests/web.rs
new file mode 100644
index 0000000..588094c
--- /dev/null
+++ b/wasm/tests/web.rs
@@ -0,0 +1,16 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use cql2_wasm::CQL2Expression;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn is_valid() {
+    let expr =
+        CQL2Expression::new("landsat:scene_id = 'LC82030282019133LGN00'".to_string()).unwrap();
+    assert!(expr.is_valid());
+}