Form data error

why do i get invalid body error even it has correct content-type header
const formData = new FormData(e.target as HTMLFormElement);

fetch('http://localhost:8000/playlist/create', {
    method: 'POST',
    headers: {
        'Content-Type': 'multipart/form-data'
    },
    body: formData,
    credentials: 'include',
}).then((v) => {
    console.log(v);
});

i am using honojs as backend
TypeError: Failed to parse body as FormData.
    at node:internal/deps/undici/undici:5675:27
    at successSteps (node:internal/deps/undici/undici:5719:27)
    at fullyReadBody (node:internal/deps/undici/undici:4609:9)
...
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