Near Kit

near-kit

A TypeScript library for NEAR Protocol with an intuitive, fetch-like API.

Quick Start

import { Near } from "near-kit";

// Read-only (no key needed)
const near = new Near({ network: "testnet" });
const data = await near.view("contract.near", "get_data", { key: "value" });

// With signing capability
const near = new Near({
  network: "testnet",
  privateKey: "ed25519:...",
  defaultSignerId: "alice.testnet",
});
await near.call("contract.near", "method", { arg: "value" });
await near.send("bob.testnet", "1 NEAR");

Import Cheatsheet

// Core
import { Near } from "near-kit";

// Keys
import { generateKey, parseSeedPhrase, generateSeedPhrase } from "near-kit";
import { RotatingKeyStore, InMemoryKeyStore } from "near-kit";
import { FileKeyStore } from "near-kit/keys/file";
import { NativeKeyStore } from "near-kit/keys/native";

// Wallet adapters
import { fromHotConnect, fromWalletSelector } from "near-kit";

// NEP-413 verification
import { verifyNep413Signature } from "near-kit";

// Utilities
import { Amount, Gas, isValidAccountId } from "near-kit";

Core Operations

View Methods (Read-Only, Free)

const result = await near.view("contract.near", "get_data", { key: "value" });
const balance = await near.getBalance("alice.near");
const exists = await near.accountExists("alice.near");

Call Methods (Requires Signing)

await near.call(
  "contract.near",
  "method",
  { arg: "value" },
  { gas: "30 Tgas", attachedDeposit: "1 NEAR" },
);

Send NEAR Tokens

await near.send("bob.near", "5 NEAR");

Type-Safe Contracts

import type { Contract } from "near-kit";

type MyContract = Contract<{
  view: {
    get_balance: (args: { account_id: string }) => Promise<string>;
  };
  call: {
    transfer: (args: { to: string; amount: string }) => Promise<void>;
  };
}>;

const contract = near.contract<MyContract>("token.near");

// View (no options needed)
await contract.view.get_balance({ account_id: "alice.near" });

// Call (options as second arg)
await contract.call.transfer(
  { to: "bob.near", amount: "10" },
  { attachedDeposit: "1 yocto" },
);

Untyped contract proxy:

const guestbook = near.contract("guestbook.near-examples.testnet");

const total = await guestbook.view.total_messages();
const result = await guestbook.call.add_message(
  { text: "Hello!" },
  { gas: "30 Tgas" },
);

Transaction Builder

Chain multiple actions in a single atomic transaction:

const result = await near
  .transaction("alice.near")
  .functionCall("counter.near", "increment", {}, { gas: "30 Tgas" })
  .transfer("counter.near", "0.001 NEAR")
  .send();

For all transaction actions and meta-transactions, see references/transactions.md

Configuration

Backend/Scripts

// Direct private key
const near = new Near({
  network: "testnet",
  privateKey: "ed25519:...",
  defaultSignerId: "alice.testnet",
});

// File-based keystore
import { FileKeyStore } from "near-kit/keys/file";
const near = new Near({
  network: "testnet",
  keyStore: new FileKeyStore("~/.near-credentials", "testnet"),
});

// High-throughput with rotating keys
import { RotatingKeyStore } from "near-kit";
const near = new Near({
  network: "mainnet",
  keyStore: new RotatingKeyStore({
    "bot.near": ["ed25519:key1...", "ed25519:key2...", "ed25519:key3..."],
  }),
});

For all key stores and utilities, see references/keys-and-testing.md

Browser Wallets

import { NearConnector } from "@hot-labs/near-connect";
import { Near, fromHotConnect } from "near-kit";

const connector = new NearConnector({ network: "mainnet" });

connector.on("wallet:signIn", async (event) => {
  const near = new Near({
    network: "mainnet",
    wallet: fromHotConnect(connector),
  });

  await near.call("contract.near", "method", { arg: "value" });
});

connector.connect();

For HOT Connect and Wallet Selector integration, see references/wallets.md

React Bindings (@near-kit/react)

import { NearProvider, useNear, useView, useCall } from "@near-kit/react";

function App() {
  return (
    <NearProvider config={{ network: "testnet" }}>
      <Counter />
    </NearProvider>
  );
}

function Counter() {
  const { data: count, isLoading } = useView<{}, number>({
    contractId: "counter.testnet",
    method: "get_count",
  });

  const { mutate: increment, isPending } = useCall({
    contractId: "counter.testnet",
    method: "increment",
  });

  if (isLoading) return <div>Loading...</div>;
  return (
    <button => increment({})} disabled={isPending}>
      Count: {count}
    </button>
  );
}

For all React hooks, React Query/SWR integration, and SSR patterns, see references/react.md

Testing with Sandbox

import { Near } from "near-kit";
import { Sandbox } from "near-kit/sandbox";

const sandbox = await Sandbox.start();
const near = new Near({ network: sandbox });

const testAccount = `test-${Date.now()}.${sandbox.rootAccount.id}`;
await near
  .transaction(sandbox.rootAccount.id)
  .createAccount(testAccount)
  .transfer(testAccount, "10 NEAR")
  .send();

await sandbox.stop();

For sandbox patterns and Vitest integration, see references/keys-and-testing.md

Error Handling

import {
  InsufficientBalanceError,
  FunctionCallError,
  NetworkError,
  TimeoutError,
} from "near-kit";

try {
  await near.call("contract.near", "method", {});
} catch (error) {
  if (error instanceof InsufficientBalanceError) {
    console.log(`Need ${error.required}, have ${error.available}`);
  } else if (error instanceof FunctionCallError) {
    console.log(`Panic: ${error.panic}`, `Logs: ${error.logs}`);
  }
}

Unit Formatting

All amounts accept human-readable formats:

"10 NEAR"; // 10 NEAR
"10"; // 10 NEAR
10; // 10 NEAR
("30 Tgas"); // 30 trillion gas units

Programmatic formatting:

import { Amount, Gas } from "near-kit";

Amount.NEAR(0.1);
Amount.yocto(1000n);
Amount.parse("5 NEAR");
Gas.parse("30 Tgas");

Key Utilities

import {
  generateKey,
  generateSeedPhrase,
  parseSeedPhrase,
  isValidAccountId,
} from "near-kit";

// Generate new keypair
const key = generateKey();
// key.publicKey, key.secretKey

// generateSeedPhrase() returns a string (just the phrase)
const seedPhrase = generateSeedPhrase();
// "word1 word2 word3 ... word12"

// parseSeedPhrase() returns a KeyPair-like object
const keyPair = parseSeedPhrase("word1 word2 ... word12");
// keyPair.publicKey, keyPair.secretKey

// Validation
isValidAccountId("alice.near"); // true

NEP-413 Verification

import { Near, verifyNep413Signature } from "near-kit";

const near = new Near({ network: "testnet" });

const isValid = await verifyNep413Signature(
  signedMessage,
  { message: "log me in", recipient: "myapp.com", nonce: challengeBuffer },
  { near, maxAge: Infinity },
);

References

For detailed documentation on specific topics:

• React Bindings - Provider, hooks, React Query/SWR, SSR/Next.js
• Wallet Integration - HOT Connect, Wallet Selector, universal patterns
• Transaction Builder - All actions, meta-transactions (NEP-366)
• Keys and Testing - Key stores, utilities, sandbox, NEP-413 signing