GPT-4 に大体書いてもらった、ChatGPT からエクスポートした conversations.json を input.json として置いておくと Scrapbox インポート用の output.json を出力してくれるスクリプト

chatgpt2scrapbox.py

import json

USERNAME="oquno"

def get_ordered_nodes(mapping, current_node):
    node_data = mapping[current_node]
    children = node_data['children']

    ordered_nodes = []

    roles = {'assistant': '[ChatGPT.icon]', 'user': f'[{USERNAME}.icon]'}
    if node_data['message'] is not None:
        content = node_data['message']['content']['parts'][0]
        role = node_data['message']['author']['role']
        if role != 'system':
            if role in roles.keys():
                role = roles[role]
            ordered_nodes.append((current_node, content, role))

    for child in children:
        ordered_nodes.extend(get_ordered_nodes(mapping, child))

    return ordered_nodes

def convert_chatgpt_to_scrapbox(input_filename, output_filename):
    with open(input_filename, 'r') as f:
        chatgpt_list = json.load(f)

    scrapbox_list = []

    for chatgpt_json in chatgpt_list:
        mapping = chatgpt_json['mapping']
        root_node_id = [node for node, data in mapping.items() if data['parent'] is None][0]

        sorted_nodes = get_ordered_nodes(mapping, root_node_id)

        lines = [chatgpt_json['title']]
        previous_role = None
        for node in sorted_nodes:
            in_code_block = False
            node_id, content, role = node
            if role != previous_role:
                lines.append(role)
                previous_role = role
            
            for line in content.split('\n'):
                if line.strip().startswith("```"):
                    in_code_block = not in_code_block
                    if in_code_block:
                        lang = "script"
                        if len(line.strip()) == 3:
                            lines.append(" code:script")
                        else:
                            lines.append(" code:" + line.strip()[3:])
                    continue
                if len(line.strip()) == 0:
                    continue
                
                if in_code_block:
                    lines.append(" " * 2 + line)
                else:
                    lines.append(" " + line)

        scrapbox_json = {
            "title": chatgpt_json['title'],
            "lines": lines
        }

        scrapbox_list.append(scrapbox_json)

    with open(output_filename, 'w') as f:
        json.dump({"pages": scrapbox_list}, f, ensure_ascii=False, indent=2)

if __name__ == '__main__':
    input_filename = 'input.json'
    output_filename = 'output.json'
    convert_chatgpt_to_scrapbox(input_filename, output_filename)

or use https://oquno.github.io/chatgpt2scrapbox/