# How can i Change data viewer list's data source with Blocks?

**URL:** https://community.thunkable.com/t/how-can-i-change-data-viewer-lists-data-source-with-blocks/1117007
**Category:** Questions about Thunkable X
**Created:** [February 22, 2021, 11:08pm UTC](https://community.thunkable.com/t/how-can-i-change-data-viewer-lists-data-source-with-blocks/1117007 "2021-02-22T23:08:44Z")
**Posts on this page:** 1
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### Author: ![drted](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/drted/32/92694_2.png) [@drted](https://community.thunkable.com/u/drted)
#### Post date: [February 23, 2021, 1:24am UTC](https://community.thunkable.com/t/how-can-i-change-data-viewer-lists-data-source-with-blocks/1117007/2 "2021-02-23T01:24:54Z")

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Perhaps this example will give you some ideas. Basically use one local datasource for display by copying from the original datasource.

> [@JSON Bound Data List Viewer - No More Cloning!](https://community.thunkable.com/t/json-bound-data-list-viewer-no-more-cloning/1041807):
>
> If you have been thunking for a while, you may have learned a few things: Data List Viewers and Data Grid Viewers are easy to design and execute quickly on devices Data List Viewer and Data Grid Viewer components cannot be bound to JSON All sorts of Web APIs and Firebase RealtimeDB (aka cloud variables) use JSON Airtable and Google Sheet data sources are generally slower and less reliable than Firebase/Cloud Variables Creating or cloning components for JSON lists are progressively slower and a…

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