I am trying to use @iota/client package.

But on building react application I get this error:

1: MZ��!�☺L�!This program cannot be run in DOS mode.
2: $�uG

error during build:
Error: Unexpected character '�' (Note that you need plugins to import files that are not JavaScript)
    at error (file:////node_modules/rollup/dist/es/shared/rollup.js:1858:30)
    at Module.error (file:////node_modules/rollup/dist/es/shared/rollup.js:12429:16)
    at Module.tryParse (file:////node_modules/rollup/dist/es/shared/rollup.js:12806:25)
    at Module.setSource (file:////node_modules/rollup/dist/es/shared/rollup.js:12711:24)
    at ModuleLoader.addModuleSource (file:////node_modules/rollup/dist/es/shared/rollup.js:21959:20)  
  • Can you share your package.json and package-lock.json files? Does it help if you delete node_modules/@iota and run npm install again? Looks like your client.js is an EXE file instead of JavaScript... That does not happen for me.
    – mihi
    Oct 1, 2023 at 20:50

1 Answer 1


@iota/client is deprecated. Please use the IOTA SDK.

About your error, the library uses WASM, which you will need to provide when using a bundler. See this guide how to do this for Rollup.

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