# Migrating from JSON-RPC

> Migrate from JSON-RPC to the new Core API using SuiGrpcClient or SuiGraphQLClient.

This guide covers migrating from `SuiJsonRpcClient` to the new client APIs. The JSON-RPC API is
being deprecated in favor of `SuiGrpcClient` and `SuiGraphQLClient`.

> **Note:** We recommend using `SuiGrpcClient` for most operations and `SuiGraphQLClient` for complex queries
> like filtering transactions and events.

## Choosing a client

| Client             | Best For                                                        |
| ------------------ | --------------------------------------------------------------- |
| `SuiGrpcClient`    | Most operations, SDK integrations, real-time data               |
| `SuiGraphQLClient` | Complex queries, filtering transactions/events, historical data |

## Quick migration to gRPC

For most use cases, migrate to `SuiGrpcClient`:

```diff
- import { SuiJsonRpcClient, getJsonRpcFullnodeUrl } from '@mysten/sui/jsonRpc';
+ import { SuiGrpcClient } from '@mysten/sui/grpc';

- const client = new SuiJsonRpcClient({
-   url: getJsonRpcFullnodeUrl('mainnet'),
-   network: 'mainnet',
- });
+ const client = new SuiGrpcClient({
+   baseUrl: 'https://fullnode.mainnet.sui.io:443',
+   network: 'mainnet',
+ });
```

Both clients use the same full node URLs, so you can use the same endpoint when migrating.

## Core API methods

The gRPC client should work with almost all mysten SDKs as a drop in replacement for the JSON-RPC
client. When using the client directly, the methods and data returned will not be exactly the same
as what was available in JSON-RPC.

## Methods replaced by core API

These JSON-RPC methods have direct replacements in the core API:

| JSON-RPC Method              | Core API Replacement                              |
| ---------------------------- | ------------------------------------------------- |
| `getCoins`                   | `listCoins`                                       |
| `getAllCoins`                | `listOwnedObjects` with `type: '0x2::coin::Coin'` |
| `getAllBalances`             | `listBalances`                                    |
| `getOwnedObjects`            | `listOwnedObjects`                                |
| `multiGetObjects`            | `getObjects`                                      |
| `getDynamicFields`           | `listDynamicFields`                               |
| `getDynamicFieldObject`      | `getDynamicField`                                 |
| `devInspectTransactionBlock` | `simulateTransaction` with `checksEnabled: false` |
| `dryRunTransactionBlock`     | `simulateTransaction`                             |
| `getNormalizedMoveFunction`  | `getMoveFunction`                                 |
| `getMoveFunctionArgTypes`    | `getMoveFunction`                                 |

### Example: Migrating devInspectTransactionBlock

```diff
- const result = await jsonRpcClient.devInspectTransactionBlock({
-   sender: '0xabc...',
-   transactionBlock: tx,
- });
- const returnValues = result.results?.[0]?.returnValues;
+ const result = await client.core.simulateTransaction({
+   transaction: tx,
+   checksEnabled: false,
+   include: { commandResults: true },
+ });
+ const returnValues = result.commandResults?.[0]?.returnValues;
```

### Example: Migrating getOwnedObjects

```diff
- const { data } = await jsonRpcClient.getOwnedObjects({
-   owner: '0xabc...',
-   options: { showContent: true },
- });
+ const { objects } = await grpcClient.listOwnedObjects({
+   owner: '0xabc...',
+   include: { content: true },
+ });
```

## Methods replaced by gRPC services

These JSON-RPC methods can be replaced by calling gRPC service clients directly:

| JSON-RPC Method                     | gRPC Service Replacement                                        |
| ----------------------------------- | --------------------------------------------------------------- |
| `getCheckpoint`                     | `ledgerService.getCheckpoint`                                   |
| `getCheckpoints`                    | `ledgerService.listCheckpoints`                                 |
| `getLatestCheckpointSequenceNumber` | `ledgerService.getCheckpoint`                                   |
| `getEpochs`                         | `ledgerService.listEpochs`                                      |
| `getCurrentEpoch`                   | `ledgerService.getEpoch`                                        |
| `getLatestSuiSystemState`           | `ledgerService.getSystemState`                                  |
| `getCommitteeInfo`                  | `ledgerService.getCommittee`                                    |
| `getValidatorsApy`                  | `ledgerService.getValidators`                                   |
| `getProtocolConfig`                 | `ledgerService.getProtocolConfig`                               |
| `getNormalizedMoveModule`           | `movePackageService.getPackage` (response includes all modules) |
| `getNormalizedMoveModulesByPackage` | `movePackageService.getPackage`                                 |
| `getNormalizedMoveStruct`           | `movePackageService.getDatatype`                                |
| `resolveNameServiceAddress`         | `nameService.lookupName`                                        |
| `resolveNameServiceNames`           | `nameService.reverseLookupName`                                 |

### Example: using gRPC service clients

```typescript

const client = new SuiGrpcClient({
	baseUrl: 'https://fullnode.mainnet.sui.io:443',
	network: 'mainnet',
});

// Get checkpoint information
const { response } = await client.ledgerService.getCheckpoint({
	sequenceNumber: 12345n,
});

// Get current epoch
const { response: epoch } = await client.ledgerService.getEpoch({});

// Get Move package information (includes all modules)
const { response: pkg } = await client.movePackageService.getPackage({
	packageId: '0x2',
});

// Get a specific Move datatype (struct or enum)
const { response: datatype } = await client.movePackageService.getDatatype({
	packageId: '0x2',
	moduleName: 'coin',
	name: 'Coin',
});

// Resolve SuiNS name
const { response: address } = await client.nameService.lookupName({
	name: 'example.sui',
});
```

## Methods requiring GraphQL

Some JSON-RPC methods don't have gRPC equivalents and require using `SuiGraphQLClient` instead:

| JSON-RPC Method             | GraphQL Alternative                |
| --------------------------- | ---------------------------------- |
| `queryTransactionBlocks`    | `transactions` query               |
| `multiGetTransactionBlocks` | `multiGetTransactionEffects` query |
| `queryEvents`               | `events` query                     |
| `getCoinMetadata`           | `coinMetadata` query               |
| `getTotalSupply`            | `coinMetadata` query               |
| `getStakes`                 | `address.stakedSuis` query         |
| `getStakesByIds`            | `multiGetObjects` query            |
| `tryGetPastObject`          | Historical object queries          |
| `getNetworkMetrics`         | Use indexer                        |
| `getAddressMetrics`         | Use indexer                        |
| `getMoveCallMetrics`        | Use indexer                        |

### Setting up GraphQL client

```typescript

const graphqlClient = new SuiGraphQLClient({
	url: 'https://sui-mainnet.mystenlabs.com/graphql',
	network: 'mainnet',
});
```

### Querying transactions

Replace `queryTransactionBlocks` with a GraphQL query:

```typescript
const result = await graphqlClient.query({
	query: `
    query QueryTransactions($sender: SuiAddress, $first: Int, $after: String) {
      transactions(
        first: $first
        after: $after
        filter: { sentAddress: $sender }
      ) {
        pageInfo {
          hasNextPage
          endCursor
        }
        nodes {
          digest
          effects {
            status
            epoch { epochId }
          }
        }
      }
    }
  `,
	variables: {
		sender: '0xabc...',
		first: 10,
	},
});
```

**Available transaction filters:**

- `sentAddress`: Filter by sender address
- `affectedAddress`: Filter by any address involved in the transaction
- `affectedObject`: Filter by object ID that was affected
- `function`: Filter by Move function called (for example, `0x2::coin::transfer`)
- `kind`: Filter by transaction kind (`SYSTEM` or `PROGRAMMABLE`)
- `atCheckpoint` / `beforeCheckpoint` / `afterCheckpoint` - Filter by checkpoint

### Querying events

Replace `queryEvents` with a GraphQL query:

```typescript
const result = await graphqlClient.query({
	query: `
    query QueryEvents($type: String, $first: Int, $after: String) {
      events(
        first: $first
        after: $after
        filter: { type: $type }
      ) {
        pageInfo {
          hasNextPage
          endCursor
        }
        nodes {
          transactionModule {
            package { address }
            name
          }
          sender { address }
          contents {
            type { repr }
            bcs
          }
        }
      }
    }
  `,
	variables: {
		type: '0x2::coin::CoinCreated',
		first: 10,
	},
});
```

**Available event filters:**

- `type`: Filter by event type (package, package::module, or full type)
- `module`: Filter by emitting module
- `sender`: Filter by transaction sender
- `atCheckpoint` / `beforeCheckpoint` / `afterCheckpoint`: Filter by checkpoint

### Fetching multiple transactions

Replace `multiGetTransactionBlocks` with a GraphQL query:

```typescript
const result = await graphqlClient.query({
	query: `
    query MultiGetTransactions($digests: [String!]!) {
      multiGetTransactionEffects(keys: $digests) {
        transaction {
          digest
          transactionBcs
        }
        status
        epoch { epochId }
      }
    }
  `,
	variables: {
		digests: ['digest1', 'digest2', 'digest3'],
	},
});
```

### Querying historical objects

Replace `tryGetPastObject` with a GraphQL query specifying a version:

```typescript
const result = await graphqlClient.query({
	query: `
    query GetObjectAtVersion($id: SuiAddress!, $version: UInt53!) {
      object(address: $id, version: $version) {
        address
        version
        digest
        asMoveObject {
          contents {
            type { repr }
            bcs
          }
        }
      }
    }
  `,
	variables: {
		id: '0x123...',
		version: 42,
	},
});
```

### Querying coin metadata

Replace `getCoinMetadata` and `getTotalSupply` with a GraphQL query:

```typescript
const result = await graphqlClient.query({
	query: `
    query GetCoinMetadata($coinType: String!) {
      coinMetadata(coinType: $coinType) {
        name
        symbol
        description
        decimals
        iconUrl
        supply
      }
    }
  `,
	variables: {
		coinType: '0x2::sui::SUI',
	},
});
```

### Querying staked SUI

Replace `getStakes` with a GraphQL query:

```typescript
const result = await graphqlClient.query({
	query: `
    query GetStakes($owner: SuiAddress!) {
      address(address: $owner) {
        stakedSuis {
          nodes {
            principal
            stakeActivationEpoch
            estimatedReward
            contents {
              bcs
            }
          }
        }
      }
    }
  `,
	variables: {
		owner: '0xabc...',
	},
});
```

## Response format differences

The gRPC client uses the core API response format, which differs from JSON-RPC responses. See the
[`@mysten/sui` migration guide](/sui/migrations/sui-2.0/sui#transaction-executors-now-accept-any-client)
for details on the new response format.

Key differences:

```diff
// Transaction result access
- const status = result.effects?.status?.status;
+ const tx = result.Transaction ?? result.FailedTransaction;
+ const status = tx.effects.status.success;

// Include options
- { showEffects: true, showEvents: true }
+ { effects: true, events: true }
```

## Client extensions

Client extensions work the same way with both clients:

```typescript

const client = new SuiGrpcClient({
	baseUrl: 'https://fullnode.mainnet.sui.io:443',
	network: 'mainnet',
}).$extend(deepbook({ address: myAddress }), suins());

// Use extended functionality
await client.deepbook.checkManagerBalance(manager, asset);
await client.suins.getName('0xabc...');
```

## See also

- [SuiGrpcClient Documentation](/sui/clients/grpc) - Full gRPC client documentation
- [SuiGraphQLClient Documentation](/sui/clients/graphql) - GraphQL client documentation
- [Core API](/sui/clients/core) - Transport-agnostic API methods
- [gRPC Overview](https://docs.sui.io/concepts/data-access/grpc-overview) - Sui gRPC API
  documentation