---
title: "API response compression"
slug: "api-response-compression"
abstract: "Overview of API response compression along with an example of the default response compression configuration."
---
# API response compression

The Commerce Service API uses JSON responses. JSON responses are not natively compressed. Response compression can optimize network bandwidth usage and increase application responsiveness. The Commerce Engine supports JSON compression using GZIP, based the on [Microsoft ASP.net Core 2.1.](https://docs.microsoft.com/en-us/aspnet/core/performance/response-compression?view=aspnetcore-2.1), and using the [Microsoft.AspNetCore.ResponseCompression](https://www.nuget.org/packages/Microsoft.AspNetCore.ResponseCompression/) package.

By default, API response compression is enabled at the fastest level, in all Commerce Engine environments (for example, *CommerceAuthoring_Sc*, *CommerceMinions,_Sc*, *CommerceShops_Sc*, and *CommerceOps_Sc*).

You can change API compression response configuration using the `C:\inetpub\wwwroot\<CommerceEnvironment>\wwwroot\config.json` file.

The following shows an example of the default response compression configuration:

```csharp
},
  "Compression": {
    "Enabled": true,
    "ResponseCompressionOptions": {
      "EnableForHttps": true,
      "MimeTypes": [
        "text/plain",
        "text/css",
        "application/javascript",
        "text/html",
        "application/xml",
        "text/xml",
        "application/json",
        "text/json",
        "application/wasm"      ]
    },
    "GzipCompressionProviderOptions": {
      "Level": "Fastest"
    }
  }

```

To disable response compression, for example, in the *CommerceAuthoring_Sc9* environment:

1. Open the `C:\inetpub\wwwroot\CommerceAuthoring_Sc\wwwroot\config.json` file.
2. In the `"Compression"` section, set the following parameter: `"Enabled":false`.
3. Save the file.

To change the compression level:

1. Open the `C:\inetpub\wwwroot\CommerceAuthoring_Sc\wwwroot\config.json` file.
2. Go to the `"GzipCompressionProviderOptions"` section, and set the `"Level"` to the desired value.

    > [!note]
    > The Commerce Engine supports the following [ASP.net Core 2.1 standard compression levels](https://docs.microsoft.com/en-us/dotnet/api/system.io.compression.compressionlevel?view=netframework-4.8): `Fastest`, `Optimal` , `NoCompression`. The default value is `Fastest`.

3. Save the file.