League ID is the number after leagueId= in your league's ESPN web address. Open your league on fantasy.espn.com and look at the address bar — for example in
fantasy.espn.com/football/team?leagueId=1234567&teamId=3&seasonId=2026
the League ID is 1234567.

Season is just the 4-digit year the league is being played, e.g. 2026 for this season — from the same address, that's the seasonId= number.

ESPN requires two values copied out of your own browser's cookies to read a private league: espn_s2 and SWID. These aren't passwords — they're just long, safe-to-copy tokens tied to your own login. This has to be done on a desktop or laptop browser (the ESPN app and mobile browsers don't expose these) — but it's a one-time setup, the values don't change often.

Chrome / Edge / Brave

1. Go to fantasy.espn.com and make sure you're logged in.
2. Right-click anywhere on the page → Inspect (or press F12 / Cmd+Opt+I on Mac).
3. In the panel that opens, click the Application tab along the top (if you don't see it, click the » arrows to reveal more tabs).
4. In the left sidebar, expand Cookies, then click https://fantasy.espn.com.
5. A table of cookies appears. Find the row named espn_s2 and copy the long text in its Value column. Then find the row named SWID and copy its value too — it looks like {ABC12345-6789-...}, keep the curly braces.

Safari

1. Safari menu → Settings → Advanced → turn on "Show features for web developers" (only needed once).
2. Go to fantasy.espn.com, logged in, then use the new Develop menu → Show Web Inspector.
3. Click the Storage tab → Cookies → fantasy.espn.com, then copy espn_s2 and SWID the same way as above.

Firefox

1. Go to fantasy.espn.com, logged in, then press F12.
2. Click the Storage tab → Cookies → https://fantasy.espn.com, then copy espn_s2 and SWID the same way as above.

Can't find a Cookies panel? Try this instead

1. With DevTools open, click the Network tab, then reload the ESPN page.
2. Click any request in the list whose name mentions espn.com.
3. Look in its "Request Headers" for a line starting with Cookie: — it's one long line packed with name=value; pairs. Scan it for espn_s2= and SWID= and copy just those two values out.