I want to get a dict from a collection property which will be used for exporting a json file. I completely have no idea how I should do it, so I don't have any code for it.

Thanks for helping me.

I have a propertyGroup-

class Favourites(PropertyGroup):
    label: StringProperty(
    idname: StringProperty(
    icon_value: IntProperty(
        name="Icon value",
    index: IntProperty(
    is_preset: BoolProperty(
        name='Is preset',
    mode: StringProperty()

And this property group is registered as Type of a CollectionProperty in register def

bpy.types.Scene.favit = CollectionProperty(type=Favourites)

I want the list of data in bpy.context.scene.favit to be stored in a json.

  • 1
    $\begingroup$ dict(your_collection)? Recommend add your data structure to the question, also how you'd like to format your data... $\endgroup$
    – brockmann
    Oct 5, 2020 at 11:20
  • $\begingroup$ Hi I added some codes from my script. Please check it. $\endgroup$
    – Me BMan
    Oct 5, 2020 at 11:29
  • $\begingroup$ Have you tried dict(C.scene.favit)? $\endgroup$
    – brockmann
    Oct 5, 2020 at 11:44
  • $\begingroup$ {'': <bpy_struct, Favourites("") at 0x000001A6DB344EC8>} It gives this result. When I try dict(C.scene.favit[0]) it gives me the properties {'label': 'Tweak', 'idname': 'builtin.select', 'icon_value': 986, 'index': 0, 'is_preset': 0} I have a list of those properties per fav $\endgroup$
    – Me BMan
    Oct 5, 2020 at 11:48
  • 1
    $\begingroup$ No worries, just trying to figure out what you'd like to achieve @MeBMan Final question: How the json string should look like? $\endgroup$
    – brockmann
    Oct 5, 2020 at 12:03

1 Answer 1


If you don't need to write out default value, just use items() like dictionary.

Unless you assign it, Blender will not create an entry for them.

import bpy
import json

data = [
    for prop in bpy.context.scene.favit

print(json.dumps(data))  # save this string to json file


[[["index", 1], ["label", "hello world"]], [["label", "cool world"]]]

The output format is same as [key, value] in a list, once you want to write back to blender,

json_string = '''[[["index", 1], ["label", "hello world"]], [["label", "cool world"]]]'''
data = json.loads(json_string)
for prop_list in data:
    prop = bpy.context.scene.favit.add()
    for key, value in prop_list:
        prop[key] = value
  • $\begingroup$ What is prop? I get error NameError: name 'props' is not defined $\endgroup$
    – Me BMan
    Oct 5, 2020 at 12:06
  • $\begingroup$ props? I didn't write props, prop maybe? $\endgroup$
    – HikariTW
    Oct 5, 2020 at 12:09
  • $\begingroup$ Oh my bad, I did a mistake. it should be ""prop"" not "props" $\endgroup$
    – Me BMan
    Oct 5, 2020 at 12:11
  • $\begingroup$ Hi, I think this is what I want. If you could also parse it out, it would be really great, How do I read per favourite when I read from the saved json? Thank you so much $\endgroup$
    – Me BMan
    Oct 5, 2020 at 12:16
  • $\begingroup$ Nice Thanks so much!. Working like charm! $\endgroup$
    – Me BMan
    Oct 5, 2020 at 12:33

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