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RPC Endpoints

Accounts / Contracts


View account

Returns basic account information.

  • method: query
  • params:

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "query",
"params": {
"request_type": "view_account",
"finality": "final",
"account_id": "nearkat.testnet"
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"amount": "399992611103597728750000000",
"locked": "0",
"code_hash": "11111111111111111111111111111111",
"storage_usage": 642,
"storage_paid_at": 0,
"block_height": 17795474,
"block_hash": "9MjpcnwW3TSdzGweNfPbkx8M74q1XzUcT1PAN8G5bNDz"
},
"id": "dontcare"
}

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by view_account request type:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
INVALID_ACCOUNTThe requested account_id is invalid
  • Provide a valid account_id
UNKNOWN_ACCOUNTThe requested account_id has not been found while viewing since the account has not been created or has been already deleted
  • Check the account_id
  • Specify a different block or retry if you request the latest state
UNAVAILABLE_SHARDThe node was unable to find the requested data because it does not track the shard where data is present
  • Send a request to a different node which might track the shard
NO_SYNCED_BLOCKSThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

View account changes

Returns account changes from transactions in a given account.

  • method: EXPERIMENTAL_changes
  • params:
    • changes_type: account_changes
    • account_ids: ["example.testnet"]
    • finality OR block_id

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "EXPERIMENTAL_changes",
"params": {
"changes_type": "account_changes",
"account_ids": ["your_account.testnet"],
"block_id": 19703467
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"block_hash": "6xsfPSG89s6fCMShxxxQTP6D4ZHM9xkGCgubayTDRzAP",
"changes": [
{
"cause": {
"type": "transaction_processing",
"tx_hash": "HLvxLKFM7gohFSqXPp5SpyydNEVpAno352qJJbnddsz3"
},
"type": "account_update",
"change": {
"account_id": "your_account.testnet",
"amount": "499999959035075000000000000",
"locked": "0",
"code_hash": "11111111111111111111111111111111",
"storage_usage": 182,
"storage_paid_at": 0
}
},
{
"cause": {
"type": "receipt_processing",
"receipt_hash": "CPenN1dp4DNKnb9LiL5hkPmu1WiKLMuM7msDjEZwDmwa"
},
"type": "account_update",
"change": {
"account_id": "your_account.testnet",
"amount": "499999959035075000000000000",
"locked": "0",
"code_hash": "11111111111111111111111111111111",
"storage_usage": 264,
"storage_paid_at": 0
}
}
]
},
"id": "dontcare"
}

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by EXPERIMENTAL_changes method:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
NOT_SYNCED_YETThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

View contract code

Returns the contract code (Wasm binary) deployed to the account. Please note that the returned code will be encoded in base64.

  • method: query
  • params:

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "query",
"params": {
"request_type": "view_code",
"finality": "final",
"account_id": "guest-book.testnet"
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"code_base64": "47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=",
"hash": "7KoFshMQkdyo5iTx8P2LbLu9jQpxRn24d27FrKShNVXs",
"block_height": 17814234,
"block_hash": "GT1D8nweVQU1zyCUv399x8vDv2ogVq71w17MyR66hXBB"
},
"id": "dontcare"
}

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by view_code request type:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
INVALID_ACCOUNTThe requested account_id is invalid
  • Provide a valid account_id
UNKNOWN_ACCOUNTThe requested account_id has not been found while viewing since the account has not been created or has been already deleted
  • Check the account_id
  • Specify a different block or retry if you request the latest state
NO_CONTRACT_CODEThe account does not have any contract deployed on it
  • Use different account
  • Specify a different block or retry if you request the latest state
UNAVAILABLE_SHARDThe node was unable to find the requested data because it does not track the shard where data is present
  • Send a request to a different node which might track the shard
NO_SYNCED_BLOCKSThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

View contract state

Returns the state (key value pairs) of a contract based on the key prefix (base64 encoded). Pass an empty string for prefix_base64 if you would like to return the entire state. Please note that the returned state will be base64 encoded as well.

  • method: query
  • params:
    • request_type: view_state
    • finality OR block_id
    • account_id: "guest-book.testnet",
    • prefix_base64: ""

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "query",
"params": {
"request_type": "view_state",
"finality": "final",
"account_id": "guest-book.testnet",
"prefix_base64": ""
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"values": [
{
"key": "bTo6MA==",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJqb3NoZm9yZC50ZXN0bmV0IiwidGV4dCI6ImhlbGxvIn0=",
"proof": []
},
{
"key": "bTo6MQ==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiY2hhZG9oIiwidGV4dCI6ImhlbGxvIGVyeWJvZHkifQ==",
"proof": []
},
{
"key": "bTo6MTA=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoic2F0b3NoaWYudGVzdG5ldCIsInRleHQiOiJIaWxsbyEifQ==",
"proof": []
},
{
"key": "bTo6MTE=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidmFsZW50aW5lc29rb2wudGVzdG5ldCIsInRleHQiOiJIaSEifQ==",
"proof": []
},
{
"key": "bTo6MTI=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJobngudGVzdG5ldCIsInRleHQiOiJoZWxsbyJ9",
"proof": []
},
{
"key": "bTo6MTM=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJobngudGVzdG5ldCIsInRleHQiOiJzZCJ9",
"proof": []
},
{
"key": "bTo6MTQ=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiamdoZy50ZXN0bmV0IiwidGV4dCI6IktoZyJ9",
"proof": []
},
{
"key": "bTo6MTU=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiYWNjb3VudC50ZXN0bmV0IiwidGV4dCI6IldoZW4gSUNPPyJ9",
"proof": []
},
{
"key": "bTo6MTY=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiYWNjb3VudC50ZXN0bmV0IiwidGV4dCI6IlRlc3QgMiJ9",
"proof": []
},
{
"key": "bTo6MTc=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidGVzdC1kcm9wLTEwLnRlc3RuZXQiLCJ0ZXh0IjoiRnJlZSBtZXNzYWdlcyBhcmUgdGhlIGJlc3QifQ==",
"proof": []
},
{
"key": "bTo6MTg=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidGVzdC1kcm9wLTEwLnRlc3RuZXQiLCJ0ZXh0IjoiV2hlbiBJQ08/In0=",
"proof": []
},
{
"key": "bTo6MTk=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidGVzdC1kcm9wLTEwLnRlc3RuZXQiLCJ0ZXh0IjoiV2hlbiBJQ08/In0=",
"proof": []
},
{
"key": "bTo6Mg==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoibnVsbCIsInRleHQiOiJ1bmRlZmluZWQifQ==",
"proof": []
},
{
"key": "bTo6MjA=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidGVzdC04NDEudGVzdG5ldCIsInRleHQiOiJXaGVuIElDTz8ifQ==",
"proof": []
},
{
"key": "bTo6MjE=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidGVzdC04NDEudGVzdG5ldCIsInRleHQiOiJoZXkgaGV5IGhleSJ9",
"proof": []
},
{
"key": "bTo6MjI=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiam9zaGZvcmQudGVzdG5ldCIsInRleHQiOiJoaSJ9",
"proof": []
},
{
"key": "bTo6MjM=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiam9zaGZvcmQudGVzdG5ldCIsInRleHQiOiJoaSB4MiJ9",
"proof": []
},
{
"key": "bTo6MjQ=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoibWFzdGVydGh5c2VsZi50ZXN0bmV0IiwidGV4dCI6ImhhbmRzaGFrZS5oYWNrbWVkb21haW4vICJ9",
"proof": []
},
{
"key": "bTo6MjU=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJtYXN0ZXJ0aHlzZWxmLnRlc3RuZXQiLCJ0ZXh0IjoiSGVsbG8gQ29zbW9zLCBob21lLmNvc21hdHJpeGNvbm5lY3Rpb25zLyJ9",
"proof": []
},
{
"key": "bTo6MjY=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJtYXN0ZXJ0aHlzZWxmLnRlc3RuZXQiLCJ0ZXh0IjoiYnVpbGQsIGJ1aWxkLCBidWlsZCBpIGNhbWUgdG8gYnVpbGQgYSBicmlkZ2UgaW4gUEVBQ0UsIHNvIGNvbWUgbGV0cyBidWlsZC4uLnNvbmcgYnkgXCJOYWhrbyBCZWFyXCIgIn0=",
"proof": []
},
{
"key": "bTo6Mjc=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJtYXN0ZXJ0aHlzZWxmLnRlc3RuZXQiLCJ0ZXh0IjoiYnVpbGQgYSBicmlkZ2UgKGh0dHBzOi8vd3d3Lmdvb2dsZS5jb20vdXJsP3NhPXQmcmN0PWomcT0mZXNyYz1zJnNvdXJjZT13ZWImY2Q9JmNhZD1yamEmdWFjdD04JnZlZD0yYWhVS0V3ajA0ZGlnMTlqckFoV05tbGtLSGR5X0FnUVEzeXd3QUhvRUNBVVFBZyZ1cmw9aHR0cHMlM0ElMkYlMkZ3d3cueW91dHViZS5jb20lMkZ3YXRjaCUzRnYlM0Rlb1RYNWZmOVplMCZ1c2c9QU92VmF3MFoxZzFIMkZzeF85d3FJSmg5RTk2UCkifQ==",
"proof": []
},
{
"key": "bTo6Mjg=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJtYXN0ZXJ0aHlzZWxmLnRlc3RuZXQiLCJ0ZXh0IjoiaHR0cDovL3RyaXBweS7wn42EbWFnaWMvIn0=",
"proof": []
},
{
"key": "bTo6Mjk=",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJtYXN0ZXJ0aHlzZWxmLnRlc3RuZXQiLCJ0ZXh0IjoiaHR0cDovL3VuaXRlLnJhaW5ib3d0cmliZXMvIn0=",
"proof": []
},
{
"key": "bTo6Mw==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiam9zaGZvcmQudGVzdG5ldCIsInRleHQiOiJobW1tbW1tIn0=",
"proof": []
},
{
"key": "bTo6MzA=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiZXhlbXBsYXJ5LnRlc3RuZXQiLCJ0ZXh0IjoiaGVsbG8ifQ==",
"proof": []
},
{
"key": "bTo6MzE=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiYWRpMjMudGVzdG5ldCIsInRleHQiOiJobW0ifQ==",
"proof": []
},
{
"key": "bTo6MzI=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiYWRpMjMudGVzdG5ldCIsInRleHQiOiJ3aGF0In0=",
"proof": []
},
{
"key": "bTo6MzM=",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoidmxhZGJhc2gudGVzdG5ldCIsInRleHQiOiJIaSJ9",
"proof": []
},
{
"key": "bTo6NA==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoibnVsbCIsInRleHQiOiIgIn0=",
"proof": []
},
{
"key": "bTo6NQ==",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJ0ZXN0YWNjb3VudDEudGVzdG5ldCIsInRleHQiOiJ0ZXN0In0=",
"proof": []
},
{
"key": "bTo6Ng==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiZXVnZW5ldGhlZHJlYW0iLCJ0ZXh0IjoibnVsbCJ9",
"proof": []
},
{
"key": "bTo6Nw==",
"value": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiZGVtby50ZXN0bmV0IiwidGV4dCI6Ikkgb25seSB3cml0ZSBmcmVlIG1lc3NhZ2VzLiJ9",
"proof": []
},
{
"key": "bTo6OA==",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJqb3NoZm9yZC50ZXN0bmV0IiwidGV4dCI6IkkgcHJlZmVyIHByZW1pdW0gbWVzc2FnZXMifQ==",
"proof": []
},
{
"key": "bTo6OQ==",
"value": "eyJwcmVtaXVtIjp0cnVlLCJzZW5kZXIiOiJuZXdsZWRnZXIzLnRlc3RuZXQiLCJ0ZXh0IjoiTGVkZ2VyIn0=",
"proof": []
},
{
"key": "bTpsZW4=",
"value": "MzQ=",
"proof": []
}
],
"proof": [],
"block_height": 17814234,
"block_hash": "GT1D8nweVQU1zyCUv399x8vDv2ogVq71w17MyR66hXBB"
},
"id": "dontcare"
}

Heads up

There is a limitation on default RPC nodes. You won't be able to get the contract state if it is too big. The default limit of for contract state is 50kb of state size. You're able to change the limits if you run your own RPC node with adjusted trie_viewer_state_size_limit value in config.json

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by view_state request type:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
INVALID_ACCOUNTThe requested account_id is invalid
  • Provide a valid account_id
UNKNOWN_ACCOUNTThe requested account_id has not been found while viewing since the account has not been created or has been already deleted
  • Check the account_id
  • Specify a different block or retry if you request the latest state
NO_CONTRACT_CODEThe account does not have any contract deployed on it
  • Query and account with contract deployed
  • Specify a different block or retry if you request the latest state
TOO_LARGE_CONTRACT_STATEThe requested contract state is too large to be returned from this node (the default limit is 50kb of state size)
  • Send the request to a node with larger limits in order to view the requested state
  • Spin up your own node where you can increase the limits to view state
UNAVAILABLE_SHARDThe node was unable to find the requested data because it does not track the shard where data is present
  • Send a request to a different node which might track the shard
NO_SYNCED_BLOCKSThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

View contract state changes

Returns the state change details of a contract based on the key prefix (encoded to base64). Pass an empty string for this param if you would like to return all state changes.

  • method: EXPERIMENTAL_changes
  • params:
    • changes_type: data_changes
    • account_ids: ["example.testnet"],
    • key_prefix_base64: "base64 encoded key value",
    • finality OR block_id

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "EXPERIMENTAL_changes",
"params": {
"changes_type": "data_changes",
"account_ids": ["guest-book.testnet"],
"key_prefix_base64": "",
"block_id": 19450732
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"block_hash": "6U8Yd4JFZwJUNfqkD4KaKgTKmpNSmVRTSggpjmsRWdKY",
"changes": [
{
"cause": {
"type": "receipt_processing",
"receipt_hash": "9ewznXgs2t7vRCssxW4thgaiwggnMagKybZ7ryLNTT2z"
},
"type": "data_update",
"change": {
"account_id": "guest-book.testnet",
"key_base64": "bTo6Mzk=",
"value_base64": "eyJwcmVtaXVtIjpmYWxzZSwic2VuZGVyIjoiZmhyLnRlc3RuZXQiLCJ0ZXh0IjoiSGkifQ=="
}
},
{
"cause": {
"type": "receipt_processing",
"receipt_hash": "9ewznXgs2t7vRCssxW4thgaiwggnMagKybZ7ryLNTT2z"
},
"type": "data_update",
"change": {
"account_id": "guest-book.testnet",
"key_base64": "bTpsZW4=",
"value_base64": "NDA="
}
}
]
},
"id": "dontcare"
}

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by EXPERIMENTAL_changes method:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
NOT_SYNCED_YETThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

View contract code changes

Returns code changes made when deploying a contract. Change is returned is a base64 encoded WASM file.

  • method: EXPERIMENTAL_changes
  • params:
    • changes_type: contract_code_changes
    • account_ids: ["example.testnet"],
    • finality OR block_id

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "EXPERIMENTAL_changes",
"params": {
"changes_type": "contract_code_changes",
"account_ids": ["dev-1602714453032-7566969"],
"block_id": 20046655
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"block_hash": "3yLNV5zdpzRJ8HP5xTXcF7jdFxuHnmKNUwWcok4616WZ",
"changes": [
{
"cause": {
"type": "receipt_processing",
"receipt_hash": "CEm3NNaNdu9cijh9NvZMM1srbtEYSsBVwGbZxFQYKt5B"
},
"type": "contract_code_update",
"change": {
"account_id": "dev-1602714453032-7566969",
"code_base64": "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..."
}
}
]
},
"id": "dontcare"
}

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by EXPERIMENTAL_changes method:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
NOT_SYNCED_YETThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details

Call a contract function

Allows you to call a contract method as a view function.

  • method: query
  • params:
    • request_type: call_function
    • finality OR block_id
    • account_id: "example.testnet"
    • method_name: name_of_a_example.testnet_method
    • args_base64: method_arguments_base_64_encoded

Example:

{
"jsonrpc": "2.0",
"id": "dontcare",
"method": "query",
"params": {
"request_type": "call_function",
"finality": "final",
"account_id": "dev-1588039999690",
"method_name": "get_num",
"args_base64": "e30="
}
}
Example response:

{
"jsonrpc": "2.0",
"result": {
"result": [48],
"logs": [],
"block_height": 17817336,
"block_hash": "4qkA4sUUG8opjH5Q9bL5mWJTnfR4ech879Db1BZXbx6P"
},
"id": "dontcare"
}

Note: [48] is an array of bytes, to be specific it is an ASCII code of 0.near-sdk-rs and near-sdk-as return JSON-serialized results.

What could go wrong?

When API request fails, RPC server returns a structured error response with a limited number of well-defined error variants, so client code can exhaustively handle all the possible error cases. Our JSON-RPC errors follow verror convention for structuring the error response:

{
"error": {
"name": <ERROR_TYPE>,
"cause": {
"info": {..},
"name": <ERROR_CAUSE>
},
"code": -32000,
"data": String,
"message": "Server error",
},
"id": "dontcare",
"jsonrpc": "2.0"
}

Heads up

The fields code, data, and message in the structure above are considered legacy ones and might be deprecated in the future. Please, don't rely on them.

Here is the exhaustive list of the error variants that can be returned by call_function request type:

ERROR_TYPE
error.name
ERROR_CAUSE
error.cause.name
ReasonSolution
HANDLER_ERRORUNKNOWN_BLOCKThe requested block has not been produced yet or it has been garbage-collected (cleaned up to save space on the RPC node)
  • Check that the requested block is legit
  • If the block had been produced more than 5 epochs ago, try to send your request to an archival node
INVALID_ACCOUNTThe requested account_id is invalid
  • Provide a valid account_id
UNKNOWN_ACCOUNTThe requested account_id has not been found while viewing since the account has not been created or has been already deleted
  • Check the account_id
  • Specify a different block or retry if you request the latest state
NO_CONTRACT_CODEThe requested contract_code has not been found while viewing
  • Check the public_key
  • Specify a different block or retry if you request the latest state
CONTRACT_EXECUTION_ERRORThe execution of the view method call failed (crashed, run out of the default 200 TGas limit, etc)
  • Check error.cause.info for more details
UNAVAILABLE_SHARDThe node was unable to find the requested data because it does not track the shard where data is present
  • Send a request to a different node which might track the shard
NO_SYNCED_BLOCKSThe node is still syncing and the requested block is not in the database yet
  • Wait until the node finish syncing
  • Send a request to a different node which is synced
REQUEST_VALIDATION_ERRORPARSE_ERRORPassed arguments can't be parsed by JSON RPC server (missing arguments, wrong format, etc.)
  • Check the arguments passed and pass the correct ones
  • Check error.cause.info for more details
INTERNAL_ERRORINTERNAL_ERRORSomething went wrong with the node itself or overloaded
  • Try again later
  • Send a request to a different node
  • Check error.cause.info for more details