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How to enable command flags for Mimic with Postman

How to enable command flags for Mimic with Postman

Written by Anton L ( Updated on January 6th, 2026 )

Updated on January 6th, 2026

As you may already know, Mimic is based on Chromium. That means it is also compatible with Chromium's command lines. They adjust Chromium browser settings and modules. Use it for various options, like disabling browser notifications and for port debugging. In this article, you will learn how to configure your profile for it.

Step 1: open your Postman

Follow the steps in the article How to set up Multilogin automation with Postman to:

Access our API documentation in Documenter
Import our API collection to your local Postman
Log in and get your authorization token

Those actions can be done in the scripts, but we will use Postman in this guide.

Step 2: choose an endpoint to run

Command flags you can add to the following endpoints:

We will use the endpoint POST Profile Create in this article.

Navigate to the “Profile Management” folder in your Postman workspace and select POST Profile Create
Select the “Body” tab
Insert your values into the variables below in the request body:
1. folder_id → find this value using our guides:
  1. DevTools
  2. Postman
  3. CLI (via list-folder command)
2. Fill out fingerprint → these parameters must be provided only if the corresponding flags are set to custom

The next step will be related to adding flags in the “Body” tab.

Step 3: add command flags

Command flags are defined as cmd_params. They should be located under fingerprints parameter:

"cmd_params": {
                "params": [
                    {
                        "flag": "FLAG NAME",
                        "value": "FLAG VALUE"
                    }
                ]
            }

You can refer to the full request body, which should make clear how to add command flags properly (replace <YOUR PROFILE NAME> and <YOUR FOLDER ID>):

Full request body

{
    "name": "<YOUR PROFILE NAME>",
    "browser_type": "mimic",
    "core_version": 142,
     "folder_id": "<YOUR FOLDER ID>",
    "os_type": "windows",
    // "automation": "selenium",
    "is_headless": false,
    "parameters": {
        "flags": {
            "audio_masking": "mask",
            "fonts_masking": "custom",
            "geolocation_masking": "custom",
            "geolocation_popup": "prompt",
            "graphics_masking": "custom",
            "graphics_noise": "mask",
            "localization_masking": "custom",
            "media_devices_masking": "custom",
            "navigator_masking": "custom",
            "ports_masking": "mask",
            "proxy_masking": "custom",
            "quic_mode": "natural",
            "screen_masking": "custom",
            "timezone_masking": "custom",
            "webrtc_masking": "custom",
            "canvas_noise:": "custom",
            "startup_behavior": "custom"
        },
        "fingerprint": {
            "navigator": {
                "hardware_concurrency": 8,
                "platform": "Win32",
                "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
                "os_cpu": ""
            },
            "localization": {
                "languages": "en-US",
                "locale": "en-US",
                "accept_languages": "en-US,en;q=0.5"
            },
            "timezone": {
                "zone": "Asia/Bangkok"
            },
            "graphic": {
                "renderer": "ANGLE (NVIDIA, NVIDIA GeForce RTX 4070 Ti Direct3D11 vs_5_0 ps_5_0, D3D11)",
                "vendor": "Google Inc. (NVIDIA)"
            },
            "webrtc": {
                "public_ip": "123.123.123.123"
            },
            "media_devices": {
                "audio_inputs": 1,
                "audio_outputs": 1,
                "video_inputs": 2
            },
            "screen": {
                "height": 1200,
                "pixel_ratio": 1,
                "width": 1920
            },
            "geolocation": {
                "accuracy": 100,
                "altitude": 100,
                "latitude": 52.02,
                "longitude": -52.1
            },
            "ports": [
                12345
            ],
            "fonts": [
                "81938139"
            ],
            "cmd_params": {
                "params": [
                    {
                        "flag": "disable-background-timer-throttling"
                    },
                    {
                        "flag": "disable-backgrounding-occluded-windows"
                    },
                    {
                        "flag": "disable-renderer-backgrounding"
                    },
                    {
                        "flag": "disable-features",
                        "value": "CalculateNativeWinOcclusion"
                    },
                    {
                        "flag": "disable-component-update"
                    }
                ]
            }
        },
        "proxy": {
            "host": "host",
            "type": "http",
            "port": 8081,
            "username": "username",
            "password": "password"
        },
        "custom_start_urls": [
            "https://multilogin.com/ ",
            "https://whoerip.com/multilogin/ "
        ]
    }
}

Important! If you are using automation in your script, you must transform it into a comment to ensure proper execution. For example:

// "automation": "selenium",

Also, the values in the request body are placeholders. Edit or remove any extra parameters, especially proxy-related ones. The request body won't be sent correctly without proper configuration.

Step 4: send the request

After you edit all necessary parameters (including command flags), click the “Send” button.

Use case: disable Chromium notifications

One of the regular cases for using command flags is disabling Chromium notifications. You can use the --disable-notifications command flag to disable Chromium notifications. This option is useful when using Multilogin X for automation.

www.bennish.net wants to 2025-12-24 at 5.49.56 PM

Request body reference, which contains disable-notification flag

{
    "name": "flag test",
    "browser_type": "mimic",
    "folder_id": "<YOUR FOLDER ID>",
    "os_type": "macos",
    "core_version": 142,
    "parameters": {
        "flags": {
            "audio_masking": "natural",
            "fonts_masking": "mask",
            "geolocation_masking": "mask",
            "geolocation_popup": "allow",
            "graphics_masking": "mask",
            "graphics_noise": "natural",
            "localization_masking": "mask",
            "media_devices_masking": "mask",
            "navigator_masking": "mask",
            "ports_masking": "natural",
            "proxy_masking": "disabled",
            "screen_masking": "natural",
            "timezone_masking": "mask",
            "webrtc_masking": "mask",
            "canvas_noise:": "disabled"
        },
        "storage": {
            "is_local": false
        },
        "fingerprint": {
            "cmd_params": {
                "params": [
                    {
                        "flag": "disable-notifications",
                        "value": "true"
                    }
                ]
            }
        }
    }
}

Use case: enable debugging port

A remote debugging port is useful for automation and troubleshooting.

Here is how it looks in the JSON snippet:

"cmd_params": {
    "params": [
        {
            "flag": "remote-debugging-port",
            "value": "28481"
        }
    ]
}

Important! If you are using automation in your script, you must transform it into a comment to ensure proper execution. For example:

// "automation": "selenium",

Request example

{
    "name": "profile name2",
    "browser_type": "mimic",
    "core_version": 142,
    "folder_id": "948bab9a-2cad-4a3f-af1f-01bfe260f85b",
    "os_type": "linux",
   // "automation": "selenium",
    "is_headless": false,
    "parameters": {
        "flags": {
            "audio_masking": "mask",
            "fonts_masking": "custom",
            "geolocation_masking": "custom",
            "geolocation_popup": "prompt",
            "graphics_masking": "custom",
            "graphics_noise": "mask",
            "localization_masking": "custom",
            "media_devices_masking": "custom",
            "navigator_masking": "custom",
            "ports_masking": "mask",
            "proxy_masking": "custom",
            "quic_mode": "natural",
            "screen_masking": "custom",
            "timezone_masking": "custom",
            "webrtc_masking": "custom",
            "canvas_noise:": "custom",
            "startup_behavior": "custom"
        },
        "fingerprint": {
            "navigator": {
                "hardware_concurrency": 8,
                "platform": "Win32",
                "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
                "os_cpu": ""
            },
            "localization": {
                "languages": "en-US",
                "locale": "en-US",
                "accept_languages": "en-US,en;q=0.5"
            },
            "timezone": {
                "zone": "Asia/Bangkok"
            },
            "graphic": {
                "renderer": "ANGLE (NVIDIA, NVIDIA GeForce RTX 4070 Ti Direct3D11 vs_5_0 ps_5_0, D3D11)",
                "vendor": "Google Inc. (NVIDIA)"
            },
            "webrtc": {
                "public_ip": "123.123.123.123"
            },
            "media_devices": {
                "audio_inputs": 1,
                "audio_outputs": 1,
                "video_inputs": 2
            },
            "screen": {
                "height": 1200,
                "pixel_ratio": 1,
                "width": 1920
            },
            "geolocation": {
                "accuracy": 100,
                "altitude": 100,
                "latitude": 52.02,
                "longitude": -52.1
            },
            "ports": [
                12345
            ],
            "fonts": [
                "81938139"
            ],
            "cmd_params": {
                "params": [
                    {
                        "flag": "remote-debugging-port",
                        "value": "28481"
                    }
                ]
            }
        }
    }
}

The values in the request body are placeholders. Edit or remove any extra parameters, especially proxy-related ones. The request body won't be sent correctly without proper configuration.

After adding those values, the request can be sent to the API. Click the “Send” button in Postman.

How to verify remote debugging port

After editing and sending the request, open the Mimic profile and go to the following link: chrome://version/
Here, you should see the Remote Debugging Port listed as 28481, confirming that the configuration is active.

To prevent the browser from stopping activity in the background, apply the following launch arguments:

{
    ...
    "parameters": {
        ...
        "fingerprint": {
            ...
            "cmd_params": {
                "params": [
                    {
                        "flag": "disable-background-timer-throttling"
                    },
                    {
                        "flag": "disable-backgrounding-occluded-windows"
                    },
                    {
                        "flag": "disable-renderer-backgrounding"
                    },
                    {
                        "flag": "disable-features",
                        "value": "CalculateNativeWinOcclusion"
                    },
                    {
                        "flag": "disable-component-update"
                    }
                ]
            }
        }
    }
}

These flags will be passed directly to the Mimic instance at startup. Here's the table of flags, which are used for this use case:

Flag	What it does
`--disable-background-timer-throttling`	Prevents Chromium from reducing the frequency of background JavaScript timers
`--disable-backgrounding-occluded-windows`	Keeps tabs active even when they are not visible (for example, minimized or behind other windows)
`--disable-renderer-backgrounding`	Prevents Chromium from lowering the priority of rendering tasks in background tabs
`--disable-features=CalculateNativeWinOcclusion`	Disables the feature that detects and slower hidden or overlapped windows down
`--disable-component-update`	Stops automatic updates of Chromium components (for example, Widevine, certificates, etc.)

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