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Home Interviews How would you store and retrieve JSON data in IndexedDB? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 30 Jun 2025
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Storing and retrieving JSON data in IndexedDB is straightforward because IndexedDB can store JavaScript objects directly — including parsed JSON objects.

Step-by-Step: Store & Retrieve JSON in IndexedDB

1. Store JSON Data

Let’s say you have a JSON object:

const jsonData = {
    id: 1,
    name: "John Doe",
    email: "john@example.com",
    skills: ["JS", "CSS", "HTML"]
};

You can store it directly:

function storeJsonData(db, storeName, data) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(storeName, 'readwrite');
        const store = tx.objectStore(storeName);

        const request = store.put(data); // `put` will add or update based on keyPath

        request.onsuccess = () => resolve(request.result);
        request.onerror = (e) => reject(`Store error: ${e.target.errorCode}`);
    });
}

2. Retrieve JSON Data

function getJsonData(db, storeName, id) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction(storeName, 'readonly');
        const store = tx.objectStore(storeName);

        const request = store.get(id);

        request.onsuccess = () => resolve(request.result);
        request.onerror = (e) => reject(`Get error: ${e.target.errorCode}`);
    });
}

3. Full Example with Usage

(async () => {
    const dbName = "JsonDB";
    const storeName = "Users";

    const jsonData = {
        id: 1,
        name: "John Doe",
        email: "john@example.com",
        skills: ["JS", "CSS", "HTML"]
    };

    // Open DB
    const db = await new Promise((resolve, reject) => {
        const request = indexedDB.open(dbName, 1);

        request.onupgradeneeded = (event) => {
            const db = event.target.result;
            if (!db.objectStoreNames.contains(storeName)) {
                db.createObjectStore(storeName, { keyPath: 'id' });
            }
        };

        request.onsuccess = () => resolve(request.result);
        request.onerror = (e) => reject(`DB open error: ${e.target.errorCode}`);
    });

    // Store JSON
    await storeJsonData(db, storeName, jsonData);
    console.log("Stored JSON data");

    // Retrieve JSON
    const stored = await getJsonData(db, storeName, 1);
    console.log("Retrieved JSON data:", stored);
})();

Optional: Store Raw JSON as String

If you prefer to store raw JSON strings instead of parsed objects:

const rawJson = JSON.stringify(jsonData);
store.put({ id: 1, json: rawJson });

.and later:

const result = await getJsonData(db, storeName, 1);
const parsed = JSON.parse(result.json);

Summary

  • You can store plain JavaScript objects (parsed JSON).
  • Use put() to insert/update, and get() to retrieve.
  • JSON strings can also be stored if needed — just serialize with JSON.stringify().
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