KV Storage

Every TMA.sh project includes a key-value store. No database setup, no connection strings — import the SDK and start reading and writing data.

Client-side API

import { createTMA } from '@tma.sh/sdk';

const tma = createTMA({ projectId: 'your-project-id' });

Set a value

Store any JSON-serializable value:

await tma.kv.set('user:123:preferences', {
  theme: 'dark',
  language: 'en',
  notifications: true,
});

Setting a key that already exists overwrites the previous value.

Get a value

Retrieve a value by key. Returns null if the key does not exist:

const prefs = await tma.kv.get('user:123:preferences');
// { theme: 'dark', language: 'en', notifications: true }

Remove a value

Remove a key and its value:

await tma.kv.remove('user:123:preferences');

Removing a key that does not exist is a no-op.

List keys by prefix

Retrieve all keys matching a prefix:

const result = await tma.kv.list('user:123:');
const keyNames = result.keys.map(k => k.name);
// ['user:123:preferences', 'user:123:scores', 'user:123:inventory']

The list() method returns an object with keys (an array of { name: string } objects) and list_complete (a boolean indicating whether all matching keys have been returned). Use colons as separators to create a natural key hierarchy. Fetch individual values with kv.get().

Specifications

Property	Limit
Max value size	128 KB
Max key size	512 bytes
Consistency	Eventually consistent (~60s)

Values are stored as JSON. The 128 KB limit applies to the serialized JSON string. Keys must be valid UTF-8 strings.

Eventually consistent means that after a write, subsequent reads from different edge locations may return the previous value for up to 60 seconds. Reads from the same location that performed the write are immediately consistent.

Key naming conventions

Use colon-separated segments for structured keys:

{entity}:{id}:{field}

Examples:

user:123:preferences
user:123:scores
leaderboard:global
session:abc123
feature:dark-mode
cache:api:weather:london

This convention makes prefix-based listing predictable and keeps your keyspace organized.

Use cases

KV storage works well for:

• User preferences — theme, language, notification settings
• Feature flags — toggle features per user or globally
• Leaderboards — store scores keyed by user ID, list by prefix
• Session data — temporary state between page loads
• Cached API responses — store third-party API results with a TTL key pattern

When to use something else

KV storage is not a database. For the following use cases, connect an external database like Supabase or Turso instead:

• Relational data — queries that join tables or filter on multiple columns
• Transactions — operations that must succeed or fail atomically
• Complex queries — full-text search, aggregations, sorting by multiple fields
• Strong consistency — reads that must always return the latest write

See the Authentication page for how to connect TMA.sh JWTs to Supabase.

Server-side usage

In API routes, use the createKV() helper from @tma.sh/sdk/server for a typed wrapper around the KV binding. See Server Helpers for details.