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Market orders execute immediately at the best available price.

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Complete Example

market-order.ts
import {
  DriftClient,
  getMarketOrderParams,
  PositionDirection,
  BASE_PRECISION,
  convertToNumber,
  PRICE_PRECISION,
  BN,
  calculateBidAskPrice,
} from '@drift-labs/sdk';

async function placeMarketOrder(driftClient: DriftClient) {
  // Get current price
  const marketIndex = 0; // SOL-PERP
  const perpMarket = driftClient.getPerpMarketAccount(marketIndex);
  const oracleData = driftClient.getOracleDataForPerpMarket(marketIndex);

  const [bidPrice, askPrice] = calculateBidAskPrice(
    perpMarket.amm,
    oracleData
  );

  console.log('Current SOL price:');
  console.log('  Bid:', convertToNumber(bidPrice, PRICE_PRECISION));
  console.log('  Ask:', convertToNumber(askPrice, PRICE_PRECISION));

  // Place market order to buy 1 SOL-PERP
  const baseAssetAmount = new BN(1).mul(BASE_PRECISION);

  const orderParams = getMarketOrderParams({
    marketIndex,
    direction: PositionDirection.LONG,
    baseAssetAmount,
  });

  console.log('\nPlacing market order...');
  const txSig = await driftClient.placePerpOrder(orderParams);
  console.log('Order placed:', txSig);

  // Wait for confirmation
  await driftClient.connection.confirmTransaction(txSig, 'confirmed');
  console.log('Order confirmed!');

  // Check position
  const user = driftClient.getUser();
  await user.fetchAccounts();
  
  const position = user.getPerpPosition(marketIndex);
  if (position) {
    console.log('\nPosition:');
    console.log('  Size:', convertToNumber(position.baseAssetAmount, BASE_PRECISION));
    console.log('  Entry:', convertToNumber(
      position.quoteAssetAmount.abs().mul(PRICE_PRECISION).div(position.baseAssetAmount.abs()),
      PRICE_PRECISION
    ));
  }
}

export { placeMarketOrder };

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With Price Protection

Set a maximum price to prevent excessive slippage: 
const currentAsk = askPrice;
const maxPrice = currentAsk.mul(new BN(105)).div(new BN(100)); // +5%

const orderParams = getMarketOrderParams({
  marketIndex: 0,
  direction: PositionDirection.LONG,
  baseAssetAmount: new BN(1).mul(BASE_PRECISION),
  price: maxPrice, // Will reject if price above this
});

await driftClient.placePerpOrder(orderParams);

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Key Points

Market orders fill against the best available liquidity in the DLOB or AMM.
Always set a maximum acceptable price to protect against slippage.
After placing, query your position to verify the fill.

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Next Steps

Limit Orders

Place limit orders

Modify Orders

Modify existing orders