How to retrieve Instagram username from User ID?

One can use https://i.instagram.com/api/v1/users/USERID/info (replace USERID by the user id). It returns a JSON in which the field user.username is that user's username.

With curl and jq installed, this shell oneliner will directly return the username:

curl -s https://i.instagram.com/api/v1/users/USERID/info/ | jq -r .user.username

However, keep in mind that this isn't an official API endpoint.

You can use this API (from official instagram site) to fetch username by user static id:

GET https://www.instagram.com/graphql/query/?query_hash=c9100bf9110dd6361671f113dd02e7d6&variables={"user_id": ${user_id}}

Replace ${user_id} with actual user id.

const username = result.data.user.reel.owner.username

before continuing I would like to inform you that due to recent experiences, this "solution" is no longer available due to the latest updates in instagram api, but I hope it will contribute to something for you!

You could access the user data that you have the userId through the instagram api through the endpoint: https://api.instagram.com/v1/users/{user-id}/?access_token=ACCESS-TOKEN However this requires [public_content], a permission that needs to be accepted by instagram so you can explore all the "public users" of instagram, this permission is no longer being waited for by instagram.

You can learn more about the instagram endpoints here: https://www.instagram.com/developer/endpoints/users/#get_users

Instagram Graph API In 2019-08-13 Instagram had introduced Business Discovery API where it allows you to get data about other Instagram Business or Creator IG Users.

For that you need following permissions:

1. instagram_basic
2. instagram_manage_insights
3. pages_read_engagement or pages_show_list

First of all you need to fetch your Instagram Business Id using this query

 https://graph.facebook.com/v7.0/{your_instagram_id}?fields=instagram_business_account&access_token={your_access_token}

then you will get Instagram Business Id

{
  "instagram_business_account": {
    "id": "17841430463493290"
  },
  "id": "101345731473817"
}

Using Instagram Business Id and your access token you can fetch anyone's user id from username

Example:

https://graph.facebook.com/v7.0/17841430463493290?fields=business_discovery.username(zimba_birbal){id,username,followers_count,media_count}&access_token={your_access_token}

Response:

    {
   "business_discovery": {
      "id": "17841401828704017",
      "username": "zimba_birbal",
      "followers_count": 166,
      "media_count": 36
   },
   "id": "17841430463493290"
}

Need modify the user agent (instagram app's agent), and use some browser web, otherwise use wget.

wget --user-agent="Instagram 85.0.0.21.100 Android (23/6.0.1; 538dpi; 1440x2560; LGE; LG-E425f; vee3e; en_US" https://i.instagram.com/api/v1/users/*SOME_ID_INSTAGRAM*/info/

find your desidered username in file "index.html" saved

Note: to find the user ID, you can add ?__a=1 to a profile URL, for example: https://www.instagram.com/*SOME_USERNAME*/?__a=1

Data 365 Instagram API that I am currently working for seems to be a suitable tool that may help you.

Birbal Zimba has already described a number of restrictions on the official API in his answer. Instagram API from data365.co doesn't have such limits.

To get the username, you should send requests including the profile_id (the same as the user_id), namely:

POST request to download profile data:

https://api.data365.co/v1.1/instagram/profile/{profile_id}/update?access_token=YOUR ACCESS TOKEN

GET request to receive profile data:

https://api.data365.co/v1.1/instagram/profile/{profile_id}?access_token=YOUR ACCESS TOKEN

You will receive a response not only a username but also a full name, biography, profile photo, business category, user gender and age, number of followers, followings, posts, and much more.

You can see a response example in JSON here.