Which came first, JavaScript or Wikipedia?

JavaScript came first, by 6 years. Brendan Eich wrote it in ten days for Netscape Navigator.

Side by side

JavaScript

JavaScript was written in about ten days in May 1995, shipped in Netscape Navigator 2.0 later that year, and was called LiveScript until December, when Netscape renamed it as part of a marketing deal with Sun. It has nothing to do with Java beyond some borrowed syntax. Standardisation as ECMAScript followed in 1997, and the language spent a decade being treated as a toy before it became the most widely deployed programming language in the world.

Wikipedia

Wikipedia launched in January 2001 as a scratchpad for Nupedia, a peer-reviewed encyclopedia project started in 2000 that had produced about two dozen articles in a year. The wiki produced more than that in its first month and Nupedia was abandoned in 2003. Wikipedia is older than Facebook, YouTube, Twitter and the iPhone.