ext-export-import

local-storage-get.js

// run in chrome -> sources -> snippets at
// chrome-extension://[extension-id]/window.html

async function storageGet(storageType, space = 2) {
    let storage_fn;
    if (storageType === 'local') {
        storage_fn = chrome.storage.local;
    } else if (storageType === 'sync') {
        storage_fn = chrome.storage.sync;
    } else {
        throw new Error('Wrong storage type');
    }

    // https://developer.chrome.com/docs/extensions/reference/api/storage#method-StorageArea-get
    const items = await storage_fn.get(null);

    const result_json = JSON.stringify(items, null, space);
    console.log(result_json);
}

await storageGet('sync', space=0);

local-storage-set.js

// no guarantees things won't break, use at your discretion
// run in chrome -> sources -> snippets at
// chrome-extension://[extension-id]/window.html

async function storageSet(storageType, json) {
    let storage_fn;
    if (storageType === 'local') {
        storage_fn = chrome.storage.local;
    } else if (storageType === 'sync') {
        storage_fn = chrome.storage.sync;
    } else {
        throw new Error('Wrong storage type');
    }
    if (!json || !Object.keys(json).length) {
        throw new Error('Empty json input');
    }

    // https://developer.chrome.com/docs/extensions/reference/api/storage#method-StorageArea-set
    // uncomment when reaady
    // await storage_fn.set(json);
    console.log("Done")
}

// paste json from the storageGet
const json = {};
await storageSet('sync', json);