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get-topic-info.md

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Get topic info

Topic info returns the following values for a topic. Queries do not change the state of the topic or require network consensus. The information is returned from a single node processing the query.

Topic Info Response:

Field Description
Topic ID The ID of the topic
Admin Key Access control for update/delete of the topic. Null if there is no key.
Submit Key Access control for ConsensusService.submitMessage. Null if there is no key.
Sequence Number Current sequence number (starting at 1 for the first submitMessage) of messages on the topic.
Running Hash SHA-384 running hash
Expiration Time Effective consensus timestamp at (and after) which submitMessage calls will no longer succeed on the topic and the topic will expire and be marked as deleted.
Topic Memo Short publicly visible memo about the topic. No guarantee of uniqueness.
Auto Renew Period The lifetime of the topic and the amount of time to extend the topic's lifetime by
Auto Renew Account Null if there is no autoRenewAccount.
Ledger ID The ID of the network the response came from. See HIP-198.

Query Signing Requirements

  • The client operator private key is required to sign the query request

Query Fees

  • Please see the transaction and query fees table for base transaction fee
  • Please use the Hedera fee estimator to estimate your query fee cost

{% tabs %} {% tab title="V1" %}

Constructor Description
new ConsensusTopicInfoQuery() Initializes the ConsensusTopicInfoQuery object 
new ConsensusTopicInfoQuery()
Method Type Description Requirement
setTopicId(<topicId>) TopicId The ID of the topic to get information for Required

{% code title="Java" %}

//Create the account info query
TopicInfoQuery query = new ConsensusTopicInfoQuery()
    .setTopicId(newTopicId);

//Submit the query to a Hedera network
TopicInfo info = query.execute(client);

//Print the account key to the console
System.out.println(info);

//v1.3.2

{% endcode %}

{% code title="JavaScript" %}

//Create the account info query
const query = new ConsensusTopicInfoQuery()
    .setTopicId(newTopicId);

//Submit the query to a Hedera network
const info = await query.execute(client);

//Print the account key to the console
console.log(info);

//v1.4.4

{% endcode %} {% endtab %} {% endtabs %}