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Assets, such as costumes and sounds, are added to either a sprite or stage, under the “costumes” and “sounds” attributes respectively

Costumes

{  
  "name": "<asset-name>",  
  "bitmapResolution": 1,  
  "dataFormat": "<file-ext>",  
  "assetId": "<md5-of-contents>",  
  "md5ext": "<md5-of-contents>.<file-ext>",  
  "rotationCenterX": 0,  
  "rotationCenterY": 0  
}

Sounds

{  
  "name": "<asset-name>",  
  "dataFormat": "<file-ext>",  
  "assetId": "<md5-of-contents>",  
  "md5ext": "<md5-of-contents>.<file-ext>",  
  "rate": 0,  
  "sampleCount": 0  
}

asset-name​

The name of the asset, i.e. the name to appear in the Scratch editor

file-ext​

The file extension of the asset, with only the following types supported:

  • Costumes
    • PNG
    • JPG/JPEG
    • SVG
    • BMP
  • Sounds
    • WAV
    • MP3
    • OGG
    • (Stereo audio is supported)

md5-of-contents​

The md5 hash of the file