# Cesium documentation links broken to sandcastle

**URL:** <https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774>\
**Category:** CesiumJS\
**Created:** [January 6, 2026, 11:22pm UTC](https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774 "2026-01-06T23:22:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rileyhowley](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/rileyhowley/32/32179_2.png) [@rileyhowley](https://community.cesium.com/u/rileyhowley)\
**Post date:** [January 6, 2026, 11:22pm UTC](https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774/1 "2026-01-06T23:22:53Z")

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Hey devs,

When reading the documentation on this page [GeoJsonDataSource - Cesium Documentation](https://cesium.com/learn/ion-sdk/ref-doc/GeoJsonDataSource.html?classFilter=GeoJsonDataSource)

The links to the examples in sandcastle appear to be broken ☹

```auto
Could not find Sandcastle gallery item with ID "GeoJSON%20simplestyle.html".

```

Nothing urgent just something to note and maybe check the other links in the documentation 🙂

Cheers

Riley

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**Author:** ![jjhembd](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jjhembd/32/10144_2.png) [@jjhembd](https://community.cesium.com/u/jjhembd)\
**Post date:** [January 7, 2026, 9:25pm UTC](https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774/2 "2026-01-07T21:25:53Z")

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Hi @rileyhowley, thanks for pointing this out! I opened an issue to track it.

> <https://github.com/CesiumGS/cesium/issues/13122>
>
> \### What happened?
> 
> As reported at https://community.cesium.com/t/cesium-documen…tation-links-broken-to-sandcastle/44774.
> 
> @jjspace we appear to be doing something to replace the IDs, that works for most Sandcastles. For example,
> https://sandcastle.cesium.com/index.html?src=Geometry%20and%20Appearances.html
> redirects to
> https://sandcastle.cesium.com/index.html?id=geometry-and-appearances
> 
> However, for these two, the redirection doesn't work. 
> https://sandcastle.cesium.com/index.html?src=GeoJSON%2520and%2520TopoJSON.html
> https://sandcastle.cesium.com/index.html?src=GeoJSON%2520simplestyle.html
> 
> Both report \`Could not find Sandcastle gallery item with ID...\`
> 
> I haven't yet done an exhaustive check, so there could be more.
> 
> \### Reproduction steps
> 
> 1. Go to https://sandcastle.cesium.com/index.html?src=GeoJSON%2520simplestyle.html
> 2. See error message in Sandcastle console
> 
> \### Sandcastle example
> 
> https://sandcastle.cesium.com/index.html?src=GeoJSON%2520simplestyle.html
> 
> \### Environment
> 
> Browser: Chrome
> CesiumJS Version: 1.137
> Operating System: Windows

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<div class="post-metadata">

**Author:** ![jjspace](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jjspace/32/4102_2.png) [@jjspace](https://community.cesium.com/u/jjspace)\
**Post date:** [January 15, 2026, 4:52pm UTC](https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774/3 "2026-01-15T16:52:39Z")

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Hey @rileyhowley, just wanted to follow up on this in case you aren’t following the Github discussion.

It seems these were a problem of a “double encoded” URL id. We have some PRs to fix this in sandcastle and in the docs which should be out next month. In the meantime if you, or anyone else, come across any more links like this you should be able to modify the URL by replacing `%2520` with just `%20` or a pure space character ` ` and it will hopefully load correctly.

Thanks for letting us know!

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**Author:** ![rileyhowley](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/rileyhowley/32/32179_2.png) [@rileyhowley](https://community.cesium.com/u/rileyhowley)\
**Post date:** [January 16, 2026, 1:42am UTC](https://community.cesium.com/t/cesium-documentation-links-broken-to-sandcastle/44774/4 "2026-01-16T01:42:50Z")

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Excellent! Thankyou