Hey there, let's break down your two questions about getting Instagram profile links from user IDs, step by step:

1. Basic Method: Get Instagram Profile Link via User ID #

Instagram has a built-in redirect mechanism for user IDs. All you need to do is construct this URL:

https://www.instagram.com/u/{user_id}/

Replace {user_id} with the actual numerical ID you have. When you visit this link, Instagram will automatically redirect you to the user's official profile page (the one with their username in the URL). For example, if the user ID is 123456, the link becomes https://www.instagram.com/u/123456/ — hit enter, and you'll land right on their profile.

2. No Third-Party Services/API: Get Profile Link or Username from User ID #

If you can't use the official API or any third-party tools, you can rely on scraping Instagram's public pages (just make sure to do this responsibly to avoid getting restricted). Here's how:

• First, build the same redirect link as above: https://www.instagram.com/u/{user_id}/
• Send an HTTP request to this URL with a valid User-Agent header (mimicking a regular browser, e.g., Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36). Without this, Instagram might block your request with a 403 error.
• Extract the info you need in one of two ways:
  • Option 1: Check the redirect URL — If the request succeeds, Instagram will send a redirect response to https://www.instagram.com/{username}/. The username here is exactly what you need, and this URL is the user's full profile link.
  • Option 2: Parse the page source — If you don't follow the redirect automatically, look through the HTML source of the page. You can search for the "username" key in the embedded JSON data (usually in <script type="application/ld+json"> or the old window._sharedData object). Use a simple regex like "username":"(.*?)" to pull out the username, then build the profile link manually with https://www.instagram.com/{extracted_username}/.

A quick heads-up: This method depends on Instagram's current page structure. If they update their frontend code, this might stop working temporarily. Also, don't spam requests — Instagram will flag repeated, automated traffic and restrict your IP.

内容的提问来源于stack exchange，提问作者Виталя ПЕков