How do I access all values from nested JSON Array?

Question

Here is my JSON array:

    [{"id":"11",
"first_name":"John",
"last_name":"Doe",
"username":"Username1234",
"email":"[email protected]",
"who":"Person",
"user_images":[{"id":"114",
"username":"Hannah_L123",
"images":"resized_1522-20131219-creativity.jpg","date":"12\/04\/2017"}]}]

I don't use the first array, but I do use the second array like this:

  user_image:  responseJson[0].user_images.map(item => ({ ...item, progress: new Animated.Value(0), unprogress: new Animated.Value(1) }))

I just want to access all the username from user_images that is already mapped. Trying these did not work: {this.state.user_image.username}//Undefined {this.state.user_image["username"]}//Undefined

What am I doing wrong?

EDIT: I found out how to do it: this.state.user_image[0].username, but how do I console.log() all of the data that contains a username? I am only logging 3 from the console.

React Native Code:

fetch('https://www.example.com/React/user.php')
      .then((response) => response.json())
      .then((responseJson) => {
        this.setState({
          user_image:  responseJson[0].user_images.map(item => ({ ...item, progress: new Animated.Value(0), unprogress: new Animated.Value(1) })),
          }, function() {
            const userImagesWithUsername = this.state.user_image.map(item => item.username != undefined);
            console.log(userImagesWithUsername);
        });
      })
      .catch((error) => {
        //console.error(error);
      });

did you use JSON.parse("your json") before trying to access the object? — slashsharp
– slashsharp, Commented Aug 15, 2018 at 16:25
No I did not, how do I do that? Because I never had a time where I would need to use JSON.parase @slashsharp — Laney Williams
– Laney Williams, Commented Aug 15, 2018 at 16:27

mcssym · Accepted Answer · 2018-08-15 18:12:20Z

1

To obtain all data that contains username you can filter the user_image Array.

const userImagesWithUsername = this.state.user_image.filter(item => item.username != undefined);

answered Aug 15, 2018 at 18:12

mcssym

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6 Comments

Laney Williams Over a year ago

thank you, but When I console log this all it does it print the whole list out again.

mcssym Over a year ago

If the whole list contains a username field I think it is normal! What do you really want to do?

Laney Williams Over a year ago

I just want all of the usernames from that list. Just that without all of the other properties, if it's possible.

mcssym Over a year ago

Ah okay! Then just add .map(item => item.username) and it’ll return a array of username

Laney Williams Over a year ago

fetch('example.com/React/user.php') .then((response) => response.json()) .then((responseJson) => { this.setState({ user_image: responseJson[0].user_images.map(item => ({ ...item, progress: new Animated.Value(0), unprogress: new Animated.Value(1) })), }, function() { const userImagesWithUsername = this.state.user_image.map(item => item.username != undefined); console.log(userImagesWithUsername); }); }) .catch((error) => { });

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