null is not an object (evaluating 'Object.Keys(headerParam)')

Question

Am trying to make web service call but this error keeps throwing in the fetch method.

I actually don't have any header to be passed. It's a plain httpGet call.

WebServiceHandler.get('https://jsonplaceholder.typicode.com/todos',null,null)
         .then((val)=>{
            Alert.alert(val);
           console.log('callapi: ' + JSON.stringify(val))
           this.setState({data:val})
         })

The code is supposed to return a list of objects. Any idea where am going wrong ? thanks in advance.

Answer 1

Try passing empty objects, instead of null :

WebServiceHandler.get(
    'https://jsonplaceholder.typicode.com/todos',
    {},
    {}
).then(val => {
    Alert.alert(val);
    console.log('callapi: ' + JSON.stringify(val));
    this.setState({ data: val });
});

Answer 2

try to catch the errors,

WebServiceHandler.get('https://jsonplaceholder.typicode.com/todos',null,{'completed':'true'})
         .then((val)=>{
           console.log('callapi: ' + JSON.stringify(val))
           this.setState({data:val})
         })
         .catch((error) => console.log('callapi:'+ JSON.stringify(error)));