diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..2212ddc
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,21 @@
+name: Cargo Check
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - name: Run fmt
+        run: cargo fmt -- --check
+      - name: Run clippy
+        run: cargo clippy
+      - name: Run check
+        run: cargo check
diff --git a/Cargo.toml b/Cargo.toml
index 3af3466..3e79e4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,8 @@ readme = "README.md"
 homepage = "https://github.com/cityjson/cjseq"
 repository = "https://github.com/cityjson/cjseq"
 
+[lib]
+crate-type = ["cdylib", "rlib"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -19,4 +21,15 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 # serde_derive = "1.0"
 
+# WASM dependencies
+wasm-bindgen = { version = "0.2", features = ["serde-serialize"] }
+serde-wasm-bindgen = "0.6"
 
+[dependencies.web-sys]
+version = "0.3"
+features = ["console"]
+
+# WASM-specific dependencies
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+console_error_panic_hook = "0.1"
+getrandom = { version = "0.2", features = ["js"] }
diff --git a/README.md b/README.md
index 7d54405..95c8320 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@
 
 ## Usage
 
-`cjseq` takes input from either a file or the standard input (stdin, if no file path is given as argument), and it always outputs the results to the standard output (stdout). 
+`cjseq` takes input from either a file or the standard input (stdin, if no file path is given as argument), and it always outputs the results to the standard output (stdout).
 The output can be a CityJSON object or a CityJSONSeq stream.
 
 ### Convert CityJSON to CityJSONSeq
@@ -70,3 +70,17 @@ cat ./data/*.city.jsonl | cjseq collect > hugefile.city.json
 
   1. the input CityJSON/Seq must be v1.1 or v2.0 (v1.0 will panic).
   2. the input JSON must be CityJSON schema-valid, use [cjval](https://github.com/cityjson/cjval) to validate.
+
+## WASM bindings
+
+`cjseq` can be used in JavaScript/TypeScript applications via WASM bindings.
+
+```sh
+cargo install wasm-pack
+```
+
+Build the WASM bindings:
+
+```sh
+wasm-pack build --release --target web --out-dir js
+```
diff --git a/js/.gitignore b/js/.gitignore
new file mode 100644
index 0000000..e69de29
diff --git a/js/LICENSE b/js/LICENSE
new file mode 100644
index 0000000..d8e1c18
--- /dev/null
+++ b/js/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Hugo Ledoux
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/js/README.md b/js/README.md
new file mode 100644
index 0000000..7d54405
--- /dev/null
+++ b/js/README.md
@@ -0,0 +1,72 @@
+
+# cjseq
+
+[![crates.io](https://img.shields.io/crates/v/cjseq.svg)](https://crates.io/crates/cjseq)
+
+`cjseq` is a Rust libray+binary for creating, processing, and modifying [CityJSONSeq](https://cityjson.org/cityjsonseq) files, as well as converting to/from [CityJSON](https://cityjson.org).
+
+## Installation
+
+### Installing the binary
+
+1. Install the [Rust compiler](https://www.rust-lang.org/learn/get-started)
+2. Run `cargo install cjseq`
+3. Then a binary called `cjseq` is installed system-wide
+
+### Installing the library
+
+1. Install the [Rust compiler](https://www.rust-lang.org/learn/get-started)
+2. Run `cargo install cjseq`
+
+### Compiling the project
+
+1. Install the [Rust compiler](https://www.rust-lang.org/learn/get-started)
+2. Clone the repository: `git clone https://github.com/cityjson/cjseq.git`
+3. Build the project: `cargo build --release`
+4. Run the program: `./target/release/cjseq --help`
+
+## Usage
+
+`cjseq` takes input from either a file or the standard input (stdin, if no file path is given as argument), and it always outputs the results to the standard output (stdout). 
+The output can be a CityJSON object or a CityJSONSeq stream.
+
+### Convert CityJSON to CityJSONSeq
+
+Convert a CityJSON file to a CityJSONSeq stream:
+
+```sh
+cjseq cat myfile.city.json > myfile.city.jsonl
+```
+
+Alternatively, to use stdin:
+
+```sh
+cat myfile.city.json | cjseq cat
+```
+
+### Convert CityJSONSeq to CityJSON
+
+Convert a CityJSONSeq stream to a CityJSON file:
+
+```sh
+cat ./data/3dbag_b2.city.jsonl | cjseq collect > 3dbag_b2.city.json
+```
+
+```sh
+cjseq collect ./data/3dbag_b2.city.jsonl > 3dbag_b2.city.json
+```
+
+[Globbing](https://en.wikipedia.org/wiki/Glob_(programming)) works for the `collect` command:
+
+```sh
+cat ./data/*.city.jsonl | cjseq collect > hugefile.city.json
+```
+
+### Filter CityJSONSeq
+
+`cat myfile.city.jsonl | cjseq filter --bbox 85007 446179 85168 446290 > mysubset.city.jsonl`
+
+## Input constraints
+
+  1. the input CityJSON/Seq must be v1.1 or v2.0 (v1.0 will panic).
+  2. the input JSON must be CityJSON schema-valid, use [cjval](https://github.com/cityjson/cjval) to validate.
diff --git a/js/cjseq.d.ts b/js/cjseq.d.ts
new file mode 100644
index 0000000..9fc3aed
--- /dev/null
+++ b/js/cjseq.d.ts
@@ -0,0 +1,62 @@
+/* tslint:disable */
+/* eslint-disable */
+/**
+ * Initialize the WASM module with panic hook for better error messages
+ */
+export function main(): void;
+/**
+ * Convert a base CityJSON metadata and array of CityJSONFeatures into a complete CityJSON object
+ *
+ * # Arguments
+ * * `base_cj` - The base CityJSON metadata object (typically first line of CityJSONSeq)
+ * * `features` - Array of CityJSONFeature objects
+ *
+ * # Returns
+ * * `Result<JsValue, JsValue>` - Complete CityJSON object or error
+ *
+ * # Example
+ * ```javascript
+ * import init, { cjseqToCj } from './cjseq.js';
+ *
+ * await init();
+ * const result = cjseqToCj(baseCityJSON, featuresArray);
+ * ```
+ */
+export function cjseqToCj(base_cj: any, features: any): any;
+
+export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
+
+export interface InitOutput {
+  readonly memory: WebAssembly.Memory;
+  readonly cjseqToCj: (a: any, b: any) => [number, number, number];
+  readonly main: () => void;
+  readonly __wbindgen_malloc: (a: number, b: number) => number;
+  readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
+  readonly __wbindgen_exn_store: (a: number) => void;
+  readonly __externref_table_alloc: () => number;
+  readonly __wbindgen_export_4: WebAssembly.Table;
+  readonly __wbindgen_free: (a: number, b: number, c: number) => void;
+  readonly __externref_table_dealloc: (a: number) => void;
+  readonly __wbindgen_start: () => void;
+}
+
+export type SyncInitInput = BufferSource | WebAssembly.Module;
+/**
+* Instantiates the given `module`, which can either be bytes or
+* a precompiled `WebAssembly.Module`.
+*
+* @param {{ module: SyncInitInput }} module - Passing `SyncInitInput` directly is deprecated.
+*
+* @returns {InitOutput}
+*/
+export function initSync(module: { module: SyncInitInput } | SyncInitInput): InitOutput;
+
+/**
+* If `module_or_path` is {RequestInfo} or {URL}, makes a request and
+* for everything else, calls `WebAssembly.instantiate` directly.
+*
+* @param {{ module_or_path: InitInput | Promise<InitInput> }} module_or_path - Passing `InitInput` directly is deprecated.
+*
+* @returns {Promise<InitOutput>}
+*/
+export default function __wbg_init (module_or_path?: { module_or_path: InitInput | Promise<InitInput> } | InitInput | Promise<InitInput>): Promise<InitOutput>;
diff --git a/js/cjseq.js b/js/cjseq.js
new file mode 100644
index 0000000..102d334
--- /dev/null
+++ b/js/cjseq.js
@@ -0,0 +1,574 @@
+let wasm;
+
+let WASM_VECTOR_LEN = 0;
+
+let cachedUint8ArrayMemory0 = null;
+
+function getUint8ArrayMemory0() {
+    if (cachedUint8ArrayMemory0 === null || cachedUint8ArrayMemory0.byteLength === 0) {
+        cachedUint8ArrayMemory0 = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachedUint8ArrayMemory0;
+}
+
+const cachedTextEncoder = (typeof TextEncoder !== 'undefined' ? new TextEncoder('utf-8') : { encode: () => { throw Error('TextEncoder not available') } } );
+
+const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
+    ? function (arg, view) {
+    return cachedTextEncoder.encodeInto(arg, view);
+}
+    : function (arg, view) {
+    const buf = cachedTextEncoder.encode(arg);
+    view.set(buf);
+    return {
+        read: arg.length,
+        written: buf.length
+    };
+});
+
+function passStringToWasm0(arg, malloc, realloc) {
+
+    if (realloc === undefined) {
+        const buf = cachedTextEncoder.encode(arg);
+        const ptr = malloc(buf.length, 1) >>> 0;
+        getUint8ArrayMemory0().subarray(ptr, ptr + buf.length).set(buf);
+        WASM_VECTOR_LEN = buf.length;
+        return ptr;
+    }
+
+    let len = arg.length;
+    let ptr = malloc(len, 1) >>> 0;
+
+    const mem = getUint8ArrayMemory0();
+
+    let offset = 0;
+
+    for (; offset < len; offset++) {
+        const code = arg.charCodeAt(offset);
+        if (code > 0x7F) break;
+        mem[ptr + offset] = code;
+    }
+
+    if (offset !== len) {
+        if (offset !== 0) {
+            arg = arg.slice(offset);
+        }
+        ptr = realloc(ptr, len, len = offset + arg.length * 3, 1) >>> 0;
+        const view = getUint8ArrayMemory0().subarray(ptr + offset, ptr + len);
+        const ret = encodeString(arg, view);
+
+        offset += ret.written;
+        ptr = realloc(ptr, len, offset, 1) >>> 0;
+    }
+
+    WASM_VECTOR_LEN = offset;
+    return ptr;
+}
+
+let cachedDataViewMemory0 = null;
+
+function getDataViewMemory0() {
+    if (cachedDataViewMemory0 === null || cachedDataViewMemory0.buffer.detached === true || (cachedDataViewMemory0.buffer.detached === undefined && cachedDataViewMemory0.buffer !== wasm.memory.buffer)) {
+        cachedDataViewMemory0 = new DataView(wasm.memory.buffer);
+    }
+    return cachedDataViewMemory0;
+}
+
+function addToExternrefTable0(obj) {
+    const idx = wasm.__externref_table_alloc();
+    wasm.__wbindgen_export_4.set(idx, obj);
+    return idx;
+}
+
+function handleError(f, args) {
+    try {
+        return f.apply(this, args);
+    } catch (e) {
+        const idx = addToExternrefTable0(e);
+        wasm.__wbindgen_exn_store(idx);
+    }
+}
+
+const cachedTextDecoder = (typeof TextDecoder !== 'undefined' ? new TextDecoder('utf-8', { ignoreBOM: true, fatal: true }) : { decode: () => { throw Error('TextDecoder not available') } } );
+
+if (typeof TextDecoder !== 'undefined') { cachedTextDecoder.decode(); };
+
+function getStringFromWasm0(ptr, len) {
+    ptr = ptr >>> 0;
+    return cachedTextDecoder.decode(getUint8ArrayMemory0().subarray(ptr, ptr + len));
+}
+
+function isLikeNone(x) {
+    return x === undefined || x === null;
+}
+
+function debugString(val) {
+    // primitive types
+    const type = typeof val;
+    if (type == 'number' || type == 'boolean' || val == null) {
+        return  `${val}`;
+    }
+    if (type == 'string') {
+        return `"${val}"`;
+    }
+    if (type == 'symbol') {
+        const description = val.description;
+        if (description == null) {
+            return 'Symbol';
+        } else {
+            return `Symbol(${description})`;
+        }
+    }
+    if (type == 'function') {
+        const name = val.name;
+        if (typeof name == 'string' && name.length > 0) {
+            return `Function(${name})`;
+        } else {
+            return 'Function';
+        }
+    }
+    // objects
+    if (Array.isArray(val)) {
+        const length = val.length;
+        let debug = '[';
+        if (length > 0) {
+            debug += debugString(val[0]);
+        }
+        for(let i = 1; i < length; i++) {
+            debug += ', ' + debugString(val[i]);
+        }
+        debug += ']';
+        return debug;
+    }
+    // Test for built-in
+    const builtInMatches = /\[object ([^\]]+)\]/.exec(toString.call(val));
+    let className;
+    if (builtInMatches && builtInMatches.length > 1) {
+        className = builtInMatches[1];
+    } else {
+        // Failed to match the standard '[object ClassName]'
+        return toString.call(val);
+    }
+    if (className == 'Object') {
+        // we're a user defined class or Object
+        // JSON.stringify avoids problems with cycles, and is generally much
+        // easier than looping through ownProperties of `val`.
+        try {
+            return 'Object(' + JSON.stringify(val) + ')';
+        } catch (_) {
+            return 'Object';
+        }
+    }
+    // errors
+    if (val instanceof Error) {
+        return `${val.name}: ${val.message}\n${val.stack}`;
+    }
+    // TODO we could test for more things here, like `Set`s and `Map`s.
+    return className;
+}
+/**
+ * Initialize the WASM module with panic hook for better error messages
+ */
+export function main() {
+    wasm.main();
+}
+
+function takeFromExternrefTable0(idx) {
+    const value = wasm.__wbindgen_export_4.get(idx);
+    wasm.__externref_table_dealloc(idx);
+    return value;
+}
+/**
+ * Convert a base CityJSON metadata and array of CityJSONFeatures into a complete CityJSON object
+ *
+ * # Arguments
+ * * `base_cj` - The base CityJSON metadata object (typically first line of CityJSONSeq)
+ * * `features` - Array of CityJSONFeature objects
+ *
+ * # Returns
+ * * `Result<JsValue, JsValue>` - Complete CityJSON object or error
+ *
+ * # Example
+ * ```javascript
+ * import init, { cjseqToCj } from './cjseq.js';
+ *
+ * await init();
+ * const result = cjseqToCj(baseCityJSON, featuresArray);
+ * ```
+ * @param {any} base_cj
+ * @param {any} features
+ * @returns {any}
+ */
+export function cjseqToCj(base_cj, features) {
+    const ret = wasm.cjseqToCj(base_cj, features);
+    if (ret[2]) {
+        throw takeFromExternrefTable0(ret[1]);
+    }
+    return takeFromExternrefTable0(ret[0]);
+}
+
+async function __wbg_load(module, imports) {
+    if (typeof Response === 'function' && module instanceof Response) {
+        if (typeof WebAssembly.instantiateStreaming === 'function') {
+            try {
+                return await WebAssembly.instantiateStreaming(module, imports);
+
+            } catch (e) {
+                if (module.headers.get('Content-Type') != 'application/wasm') {
+                    console.warn("`WebAssembly.instantiateStreaming` failed because your server does not serve Wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\n", e);
+
+                } else {
+                    throw e;
+                }
+            }
+        }
+
+        const bytes = await module.arrayBuffer();
+        return await WebAssembly.instantiate(bytes, imports);
+
+    } else {
+        const instance = await WebAssembly.instantiate(module, imports);
+
+        if (instance instanceof WebAssembly.Instance) {
+            return { instance, module };
+
+        } else {
+            return instance;
+        }
+    }
+}
+
+function __wbg_get_imports() {
+    const imports = {};
+    imports.wbg = {};
+    imports.wbg.__wbg_String_8f0eb39a4a4c2f66 = function(arg0, arg1) {
+        const ret = String(arg1);
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
+    imports.wbg.__wbg_buffer_609cc3eee51ed158 = function(arg0) {
+        const ret = arg0.buffer;
+        return ret;
+    };
+    imports.wbg.__wbg_call_672a4d21634d4a24 = function() { return handleError(function (arg0, arg1) {
+        const ret = arg0.call(arg1);
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_done_769e5ede4b31c67b = function(arg0) {
+        const ret = arg0.done;
+        return ret;
+    };
+    imports.wbg.__wbg_entries_3265d4158b33e5dc = function(arg0) {
+        const ret = Object.entries(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_error_524f506f44df1645 = function(arg0) {
+        console.error(arg0);
+    };
+    imports.wbg.__wbg_error_7534b8e9a36f1ab4 = function(arg0, arg1) {
+        let deferred0_0;
+        let deferred0_1;
+        try {
+            deferred0_0 = arg0;
+            deferred0_1 = arg1;
+            console.error(getStringFromWasm0(arg0, arg1));
+        } finally {
+            wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
+        }
+    };
+    imports.wbg.__wbg_get_67b2ba62fc30de12 = function() { return handleError(function (arg0, arg1) {
+        const ret = Reflect.get(arg0, arg1);
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_get_b9b93047fe3cf45b = function(arg0, arg1) {
+        const ret = arg0[arg1 >>> 0];
+        return ret;
+    };
+    imports.wbg.__wbg_getwithrefkey_1dc361bd10053bfe = function(arg0, arg1) {
+        const ret = arg0[arg1];
+        return ret;
+    };
+    imports.wbg.__wbg_instanceof_ArrayBuffer_e14585432e3737fc = function(arg0) {
+        let result;
+        try {
+            result = arg0 instanceof ArrayBuffer;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_instanceof_Map_f3469ce2244d2430 = function(arg0) {
+        let result;
+        try {
+            result = arg0 instanceof Map;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_instanceof_Uint8Array_17156bcf118086a9 = function(arg0) {
+        let result;
+        try {
+            result = arg0 instanceof Uint8Array;
+        } catch (_) {
+            result = false;
+        }
+        const ret = result;
+        return ret;
+    };
+    imports.wbg.__wbg_isArray_a1eab7e0d067391b = function(arg0) {
+        const ret = Array.isArray(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_isSafeInteger_343e2beeeece1bb0 = function(arg0) {
+        const ret = Number.isSafeInteger(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_iterator_9a24c88df860dc65 = function() {
+        const ret = Symbol.iterator;
+        return ret;
+    };
+    imports.wbg.__wbg_length_a446193dc22c12f8 = function(arg0) {
+        const ret = arg0.length;
+        return ret;
+    };
+    imports.wbg.__wbg_length_e2d2a49132c1b256 = function(arg0) {
+        const ret = arg0.length;
+        return ret;
+    };
+    imports.wbg.__wbg_new_405e22f390576ce2 = function() {
+        const ret = new Object();
+        return ret;
+    };
+    imports.wbg.__wbg_new_5e0be73521bc8c17 = function() {
+        const ret = new Map();
+        return ret;
+    };
+    imports.wbg.__wbg_new_78feb108b6472713 = function() {
+        const ret = new Array();
+        return ret;
+    };
+    imports.wbg.__wbg_new_8a6f238a6ece86ea = function() {
+        const ret = new Error();
+        return ret;
+    };
+    imports.wbg.__wbg_new_a12002a7f91c75be = function(arg0) {
+        const ret = new Uint8Array(arg0);
+        return ret;
+    };
+    imports.wbg.__wbg_next_25feadfc0913fea9 = function(arg0) {
+        const ret = arg0.next;
+        return ret;
+    };
+    imports.wbg.__wbg_next_6574e1a8a62d1055 = function() { return handleError(function (arg0) {
+        const ret = arg0.next();
+        return ret;
+    }, arguments) };
+    imports.wbg.__wbg_set_37837023f3d740e8 = function(arg0, arg1, arg2) {
+        arg0[arg1 >>> 0] = arg2;
+    };
+    imports.wbg.__wbg_set_3f1d0b984ed272ed = function(arg0, arg1, arg2) {
+        arg0[arg1] = arg2;
+    };
+    imports.wbg.__wbg_set_65595bdd868b3009 = function(arg0, arg1, arg2) {
+        arg0.set(arg1, arg2 >>> 0);
+    };
+    imports.wbg.__wbg_set_8fc6bf8a5b1071d1 = function(arg0, arg1, arg2) {
+        const ret = arg0.set(arg1, arg2);
+        return ret;
+    };
+    imports.wbg.__wbg_stack_0ed75d68575b0f3c = function(arg0, arg1) {
+        const ret = arg1.stack;
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
+    imports.wbg.__wbg_value_cd1ffa7b1ab794f1 = function(arg0) {
+        const ret = arg0.value;
+        return ret;
+    };
+    imports.wbg.__wbindgen_as_number = function(arg0) {
+        const ret = +arg0;
+        return ret;
+    };
+    imports.wbg.__wbindgen_bigint_from_i64 = function(arg0) {
+        const ret = arg0;
+        return ret;
+    };
+    imports.wbg.__wbindgen_bigint_from_u64 = function(arg0) {
+        const ret = BigInt.asUintN(64, arg0);
+        return ret;
+    };
+    imports.wbg.__wbindgen_bigint_get_as_i64 = function(arg0, arg1) {
+        const v = arg1;
+        const ret = typeof(v) === 'bigint' ? v : undefined;
+        getDataViewMemory0().setBigInt64(arg0 + 8 * 1, isLikeNone(ret) ? BigInt(0) : ret, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, !isLikeNone(ret), true);
+    };
+    imports.wbg.__wbindgen_boolean_get = function(arg0) {
+        const v = arg0;
+        const ret = typeof(v) === 'boolean' ? (v ? 1 : 0) : 2;
+        return ret;
+    };
+    imports.wbg.__wbindgen_debug_string = function(arg0, arg1) {
+        const ret = debugString(arg1);
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
+    imports.wbg.__wbindgen_error_new = function(arg0, arg1) {
+        const ret = new Error(getStringFromWasm0(arg0, arg1));
+        return ret;
+    };
+    imports.wbg.__wbindgen_in = function(arg0, arg1) {
+        const ret = arg0 in arg1;
+        return ret;
+    };
+    imports.wbg.__wbindgen_init_externref_table = function() {
+        const table = wasm.__wbindgen_export_4;
+        const offset = table.grow(4);
+        table.set(0, undefined);
+        table.set(offset + 0, undefined);
+        table.set(offset + 1, null);
+        table.set(offset + 2, true);
+        table.set(offset + 3, false);
+        ;
+    };
+    imports.wbg.__wbindgen_is_bigint = function(arg0) {
+        const ret = typeof(arg0) === 'bigint';
+        return ret;
+    };
+    imports.wbg.__wbindgen_is_function = function(arg0) {
+        const ret = typeof(arg0) === 'function';
+        return ret;
+    };
+    imports.wbg.__wbindgen_is_object = function(arg0) {
+        const val = arg0;
+        const ret = typeof(val) === 'object' && val !== null;
+        return ret;
+    };
+    imports.wbg.__wbindgen_is_string = function(arg0) {
+        const ret = typeof(arg0) === 'string';
+        return ret;
+    };
+    imports.wbg.__wbindgen_is_undefined = function(arg0) {
+        const ret = arg0 === undefined;
+        return ret;
+    };
+    imports.wbg.__wbindgen_jsval_eq = function(arg0, arg1) {
+        const ret = arg0 === arg1;
+        return ret;
+    };
+    imports.wbg.__wbindgen_jsval_loose_eq = function(arg0, arg1) {
+        const ret = arg0 == arg1;
+        return ret;
+    };
+    imports.wbg.__wbindgen_memory = function() {
+        const ret = wasm.memory;
+        return ret;
+    };
+    imports.wbg.__wbindgen_number_get = function(arg0, arg1) {
+        const obj = arg1;
+        const ret = typeof(obj) === 'number' ? obj : undefined;
+        getDataViewMemory0().setFloat64(arg0 + 8 * 1, isLikeNone(ret) ? 0 : ret, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, !isLikeNone(ret), true);
+    };
+    imports.wbg.__wbindgen_number_new = function(arg0) {
+        const ret = arg0;
+        return ret;
+    };
+    imports.wbg.__wbindgen_string_get = function(arg0, arg1) {
+        const obj = arg1;
+        const ret = typeof(obj) === 'string' ? obj : undefined;
+        var ptr1 = isLikeNone(ret) ? 0 : passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        var len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
+    };
+    imports.wbg.__wbindgen_string_new = function(arg0, arg1) {
+        const ret = getStringFromWasm0(arg0, arg1);
+        return ret;
+    };
+    imports.wbg.__wbindgen_throw = function(arg0, arg1) {
+        throw new Error(getStringFromWasm0(arg0, arg1));
+    };
+
+    return imports;
+}
+
+function __wbg_init_memory(imports, memory) {
+
+}
+
+function __wbg_finalize_init(instance, module) {
+    wasm = instance.exports;
+    __wbg_init.__wbindgen_wasm_module = module;
+    cachedDataViewMemory0 = null;
+    cachedUint8ArrayMemory0 = null;
+
+
+    wasm.__wbindgen_start();
+    return wasm;
+}
+
+function initSync(module) {
+    if (wasm !== undefined) return wasm;
+
+
+    if (typeof module !== 'undefined') {
+        if (Object.getPrototypeOf(module) === Object.prototype) {
+            ({module} = module)
+        } else {
+            console.warn('using deprecated parameters for `initSync()`; pass a single object instead')
+        }
+    }
+
+    const imports = __wbg_get_imports();
+
+    __wbg_init_memory(imports);
+
+    if (!(module instanceof WebAssembly.Module)) {
+        module = new WebAssembly.Module(module);
+    }
+
+    const instance = new WebAssembly.Instance(module, imports);
+
+    return __wbg_finalize_init(instance, module);
+}
+
+async function __wbg_init(module_or_path) {
+    if (wasm !== undefined) return wasm;
+
+
+    if (typeof module_or_path !== 'undefined') {
+        if (Object.getPrototypeOf(module_or_path) === Object.prototype) {
+            ({module_or_path} = module_or_path)
+        } else {
+            console.warn('using deprecated parameters for the initialization function; pass a single object instead')
+        }
+    }
+
+    if (typeof module_or_path === 'undefined') {
+        module_or_path = new URL('cjseq_bg.wasm', import.meta.url);
+    }
+    const imports = __wbg_get_imports();
+
+    if (typeof module_or_path === 'string' || (typeof Request === 'function' && module_or_path instanceof Request) || (typeof URL === 'function' && module_or_path instanceof URL)) {
+        module_or_path = fetch(module_or_path);
+    }
+
+    __wbg_init_memory(imports);
+
+    const { instance, module } = await __wbg_load(await module_or_path, imports);
+
+    return __wbg_finalize_init(instance, module);
+}
+
+export { initSync };
+export default __wbg_init;
diff --git a/js/cjseq_bg.wasm b/js/cjseq_bg.wasm
new file mode 100644
index 0000000..b91350d
Binary files /dev/null and b/js/cjseq_bg.wasm differ
diff --git a/js/cjseq_bg.wasm.d.ts b/js/cjseq_bg.wasm.d.ts
new file mode 100644
index 0000000..2417877
--- /dev/null
+++ b/js/cjseq_bg.wasm.d.ts
@@ -0,0 +1,13 @@
+/* tslint:disable */
+/* eslint-disable */
+export const memory: WebAssembly.Memory;
+export const cjseqToCj: (a: any, b: any) => [number, number, number];
+export const main: () => void;
+export const __wbindgen_malloc: (a: number, b: number) => number;
+export const __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
+export const __wbindgen_exn_store: (a: number) => void;
+export const __externref_table_alloc: () => number;
+export const __wbindgen_export_4: WebAssembly.Table;
+export const __wbindgen_free: (a: number, b: number, c: number) => void;
+export const __externref_table_dealloc: (a: number) => void;
+export const __wbindgen_start: () => void;
diff --git a/js/package.json b/js/package.json
new file mode 100644
index 0000000..2517199
--- /dev/null
+++ b/js/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "@cityjson/cjseq",
+  "type": "module",
+  "collaborators": [
+    "Hugo Ledoux <h.ledoux@tudelft.nl>"
+  ],
+  "description": "Create+process+modify+convert CityJSONSeq ",
+  "version": "0.0.1",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/cityjson/cjseq"
+  },
+  "files": [
+    "cjseq_bg.wasm",
+    "cjseq.js",
+    "cjseq.d.ts"
+  ],
+  "main": "cjseq.js",
+  "homepage": "https://github.com/cityjson/cjseq",
+  "types": "cjseq.d.ts",
+  "sideEffects": [
+    "./snippets/*"
+  ],
+  "publishConfig": {
+    "access": "public"
+  }
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 5796d24..03d0bb8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1221,3 +1221,25 @@ impl Appearance {
         };
     }
 }
+
+/// Collects a base CityJSON metadata and a vector of CityJSONFeatures
+/// into a complete CityJSON object
+pub fn cjseq_to_cj(mut base_cj: CityJSON, features: Vec<CityJSONFeature>) -> CityJSON {
+    for mut feature in features {
+        base_cj.add_cjfeature(&mut feature);
+    }
+
+    base_cj.remove_duplicate_vertices();
+    base_cj.update_transform();
+    base_cj.update_geographicalextent();
+
+    base_cj
+}
+
+// WASM bindings module
+#[cfg(target_arch = "wasm32")]
+pub mod wasm;
+
+// Re-export WASM functions for convenience
+#[cfg(target_arch = "wasm32")]
+pub use wasm::*;
diff --git a/src/wasm.rs b/src/wasm.rs
new file mode 100644
index 0000000..ddbea96
--- /dev/null
+++ b/src/wasm.rs
@@ -0,0 +1,66 @@
+//! WASM bindings for CityJSONSeq operations
+//!
+//! This module provides WebAssembly bindings for the cjseq library,
+//! allowing JavaScript/TypeScript applications to process CityJSONSeq
+//! files directly in the browser or Node.js.
+
+use crate::{cjseq_to_cj, CityJSON, CityJSONFeature};
+use serde_wasm_bindgen::{from_value, to_value};
+use wasm_bindgen::prelude::*;
+
+/// Initialize the WASM module with panic hook for better error messages
+#[wasm_bindgen(start)]
+pub fn main() {
+    console_error_panic_hook::set_once();
+}
+
+/// Convert a base CityJSON metadata and array of CityJSONFeatures into a complete CityJSON object
+///
+/// # Arguments
+/// * `base_cj` - The base CityJSON metadata object (typically first line of CityJSONSeq)
+/// * `features` - Array of CityJSONFeature objects
+///
+/// # Returns
+/// * `Result<JsValue, JsValue>` - Complete CityJSON object or error
+///
+/// # Example
+/// ```javascript
+/// import init, { cjseqToCj } from './cjseq.js';
+///
+/// await init();
+/// const result = cjseqToCj(baseCityJSON, featuresArray);
+/// ```
+#[wasm_bindgen(js_name = cjseqToCj)]
+pub fn cjseq_to_cj_wasm(base_cj: JsValue, features: JsValue) -> Result<JsValue, JsValue> {
+    let base_cj: CityJSON = match from_value(base_cj) {
+        Ok(cj) => cj,
+        Err(e) => {
+            web_sys::console::error_1(&format!("failed to deserialize base_cj: {}", e).into());
+            return Err(JsValue::from_str(&format!(
+                "failed to parse base_cj: {}",
+                e
+            )));
+        }
+    };
+
+    let features: Vec<CityJSONFeature> = match from_value(features) {
+        Ok(f) => f,
+        Err(e) => {
+            web_sys::console::error_1(&format!("failed to deserialize features: {}", e).into());
+            return Err(JsValue::from_str(&format!(
+                "failed to parse features: {}",
+                e
+            )));
+        }
+    };
+
+    let cj = cjseq_to_cj(base_cj, features);
+
+    match to_value(&cj) {
+        Ok(js_val) => Ok(js_val),
+        Err(e) => {
+            web_sys::console::error_1(&format!("failed to serialize cj: {}", e).into());
+            Err(JsValue::from_str(&format!("failed to serialize cj: {}", e)))
+        }
+    }
+}