---
title: "Create schema"
slug: "datastream-createschemas"
updated: 2026-09-17T09:47:59Z
published: 2026-09-17T09:47:59Z
canonical: "api.ncloud-docs.com/datastream-createschemas"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://api.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create schema

Available in VPC

Create a schema on a topic.

              Note

              

Schemas are used to define the structure of messages. You can register a value schema to manage the structure of message values.

## Request

This section describes the request format. The method and URI are as follows:

| Method | URI |
| --- | --- |
| POST | /api/v1/topics/{topicId}/schemas |

### Request headers

For information about the headers common to all Data Stream APIs, see [Data Stream request headers](/docs/en/datastream-overview#%EC%9A%94%EC%B2%AD%ED%97%A4%EB%8D%94).

### Request path parameters

You can use the following path parameters with your request:

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `topicId` | String | Required | Topic ID - See [Get topic list](/docs/en/datastream-gettopic). |

### Request body

You can include the following data in the body of your request:

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `schemaType` | String | Required | Schema type - `AVRO` \| `JSON` \| `PROTOBUF` - `AVRO`: Apache Avro schema - `JSON`: JSON schema - `PROTOBUF`: Protocol Buffers schema |
| `schema` | String | Required | Schema definition - Write in the format appropriate for the selected schema type. - Pass in JSON string format. |

### Request example

The request example is as follows:

#### Create AVRO schema

```
curl --location --request POST 'https://datastream.apigw.ntruss.com/api/v1/topics/mgNWA*****/schemas' \
--header 'x-ncp-apigw-timestamp: {Timestamp}' \
--header 'x-ncp-iam-access-key: {Access Key}' \
--header 'x-ncp-apigw-signature-v2: {API Gateway Signature}' \
--data '{
  "schemaType": "AVRO",
  "schema": "{\"type\":\"record\",\"name\":\"User\",\"fields\":[{\"name\":\"id\",\"type\":\"int\"},{\"name\":\"name\",\"type\":\"string\"},{\"name\":\"email\",\"type\":\"string\"}]}"
}'
```

#### Create JSON schema

```
curl --location --request POST 'https://datastream.apigw.ntruss.com/api/v1/topics/mgNWA*****/schemas' \
--header 'x-ncp-apigw-timestamp: {Timestamp}' \
--header 'x-ncp-iam-access-key: {Access Key}' \
--header 'x-ncp-apigw-signature-v2: {API Gateway Signature}' \
--data '{
  "schemaType": "JSON",
  "schema": "{\"$schema\":\"http://json-schema.org/draft-07/schema#\",\"type\":\"object\",\"properties\":{\"id\":{\"type\":\"integer\"},\"name\":{\"type\":\"string\"},\"email\":{\"type\":\"string\"}},\"required\":[\"id\",\"name\"]}"
}'
```

## Response

This section describes the response format.

### Response status codes

For information about the HTTP status codes common to all Data Stream APIs, see [Data Stream response status codes](/docs/en/datastream-overview#%EC%9D%91%EB%8B%B5%EC%83%81%ED%83%9C%EC%BD%94%EB%93%9C).

### Response example

If the schemas are successfully created, there is no response body, and a status code 200 is returned.

```
HTTP/1.1 200 OK
```