Emscripten's embind's std::vector<std::string> example (tested with emscripten 2.0.6)

build-run.sh

#!/bin/bash
em++ --bind cpp-code.cpp --post-js js-code.js -o output.js
node output.js

cpp-code.cpp

#include <emscripten/bind.h>
#include <iostream>
#include <string>
#include <vector>

void use_vector_string(const std::vector<std::string> &vec) {
    std::cout << "size() = " << vec.size() << ", capacity()=" << vec.capacity() << "\n";
    for (const auto &str : vec) {
        std::cout << "vec[]=|" << str << "|\n";
    }
}
 
EMSCRIPTEN_BINDINGS(EmbindVectorStringDemo) {
    emscripten::register_vector<std::string>("StringList");
    emscripten::function("use_vector_string", &use_vector_string);
}

js-code.js

Module.onRuntimeInitialized = function() {  // Make sure EMSCRIPTEN_BINDINGS are called before we try to use them
    const vec = new Module.StringList();  // Allocates std::vector<std::string> which is managed by JS
    vec.push_back("hello");  // std::string and JavaScript strings are automatically interconverted
    vec.push_back("world");
    vec.push_back("1234");
    Module.use_vector_string(vec);
    vec.delete();  // Required to avoid C++ memory leaks and undestructed object
}