TypeError: JSON.stringify(...).then is not a function
fetch('http://localhost:5000/', {
method : 'post',
headers :{ 'Content-Type' : 'application/json'},
body : JSON.stringify({
userId : this.state.userId,
password : this.state.password
})
}).then(response => response.json())
.then(data => {
if(data === 'success'){
this.props.onRouteChange('home');
}
})