MetaMask - RPC Error: Error: Invalid transaction value of 0.001 number must be in wei

I want use MetaMask to send ETH or ERC20 Tokens
The following script i am using is throwing error,

RPC Error: Error: Invalid transaction value of 0.001 number must be in wei

const method = 'eth_sendTransaction'
const parameters = [{
    from: account,
    to: to,
    value: 0.001
}]
const from = account
const payload = {
    method: method,
    params: parameters,
    from: from,
}
web3.currentProvider.sendAsync(payload, function (err, response) {

});