decodeEventLog
Decodes ABI encoded event topics & data (from an Event Log) into an event name and structured arguments (both indexed & non-indexed).
Install
ts
import { decodeEventLog } from 'viem'
Usage
ts
import { decodeEventLog } from 'viem'
const topics = decodeEventLog({
abi: wagmiAbi,
data: '0x0000000000000000000000000000000000000000000000000000000000000001',
topics: [
'0x406dade31f7ae4b5dbc276258c28dde5ae6d5c2773c5745802c493a2360e55e0',
'0x00000000000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
'0x0000000000000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c8'
]
})
/**
* {
* eventName: 'Transfer',
* args: {
* from: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266',
* to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8'
* value: 1n
* }
* }
*/
ts
export const wagmiAbi = [
...
{
inputs: [
{
indexed: true,
name: 'from',
type: 'address',
},
{ indexed: true, name: 'to', type: 'address' },
{
indexed: false,
name: 'value',
type: 'uint256',
},
],
name: 'Transfer',
type: 'event',
},
...
] as const;
ts
import { createPublicClient, http } from 'viem'
import { mainnet } from 'viem/chains'
export const publicClient = createPublicClient({
chain: mainnet,
transport: http()
})
Return Value
ts
{
eventName: string;
args: Inferred;
}
Decoded ABI event topics.
Parameters
abi
- Type:
Abi
The contract's ABI.
ts
const topics = decodeEventLog({
abi: wagmiAbi,
data: '0x0000000000000000000000000000000000000000000000000000000000000001',
topics: [
'0x406dade31f7ae4b5dbc276258c28dde5ae6d5c2773c5745802c493a2360e55e0',
'0x00000000000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
'0x0000000000000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c8'
]
})
topics
- Type:
[Hex, ...(Hex | Hex[] | null)[]]
A set of topics (encoded indexed args) from the Event Log.
ts
const topics = decodeEventLog({
abi: wagmiAbi,
data: '0x0000000000000000000000000000000000000000000000000000000000000001',
topics: [
'0x406dade31f7ae4b5dbc276258c28dde5ae6d5c2773c5745802c493a2360e55e0',
'0x00000000000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
'0x0000000000000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c8'
]
})
data (optional)
- Type:
string
The data (encoded non-indexed args) from the Event Log.
ts
const topics = decodeEventLog({
abi: wagmiAbi,
data: '0x0000000000000000000000000000000000000000000000000000000000000001',
topics: [
'0x406dade31f7ae4b5dbc276258c28dde5ae6d5c2773c5745802c493a2360e55e0',
'0x00000000000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
'0x0000000000000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c8'
]
})
eventName (optional)
- Type:
string
An event name from the ABI. Provide an eventName to infer the return type of decodeEventLog.
ts
const topics = decodeEventLog({
abi: wagmiAbi,
eventName: 'Transfer',
topics: [
'0x406dade31f7ae4b5dbc276258c28dde5ae6d5c2773c5745802c493a2360e55e0',
'0x00000000000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
'0x0000000000000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c8'
]
})