Getting Started

You can install the Wasmer Standalone runtime by following the instructions below:
If you haven't done so already, install the Wasmer Command Line Interface (CLI) for macOS/Linux:
curl -sSfL | sh
Or you can use this PowerShell command if you are in Windows:
iwr -useb | iex
Note: All Wasmer executables can be found on our Github Releases Page.
Alternative installation methods can be found in the wasmer-install repository.
Once the Wasmer CLI is installed, you can run Wasm modules and WAPM packages directly from the command line!
In this example, we will be using Python compiled to WebAssembly. To do this we are going to use the python/python package from wapm:
wasmer run python/python
Which should bring up the QuickJS prompt which you can then interact with. See an example below:
wasmer CLI running the WAPM Python package
Wasmer can also run standalone WASI or Emscripten Wasm apps, simply point wasmer run to the .wasm file!
wasmer run my-emscripten-or-wasi-file.wasm
Next, we can take a look at the command line flags and arguments for the CLI, for more advanced usage.
Wasmer needs some requirements to be met to run properly. On Linux, you will have to be sure you have a compatible libc/libstdc++. Wasmer expects the following ABI versions to be available:
  • GLIBC: >= 2.27
  • GLIBCXX: >= 3.4.21
To verify if your environments provides the correct versions you can use the commands below:
strings $LIBC_PATH | grep -e '^GLIBC'
strings $LIBCXX_PATH | grep -e '^GLIBCXX'
Note that you will need to install gcc and binutils for these commands to work.
If you can't match these requirements you will have to build Wasmer manually.