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Using JSLint For Evil

ryantravistate
Talks
YouTube
2 HN users recommended this talk2 months2013–2023 score 2
Years with an HN recommendation, 2007–2026

Linked in licensing threads as a short, funny story about the 'no evil' clause and IBM's request for an exception.

A three-minute clip in which Douglas Crockford explains why he allowed the JSLint reference implementation to be used for evil. It recounts the license clause and how corporate lawyers reacted.

“This reminds me of Douglas Crockford's classic story about the JSLint license” (HN, 2020)

2 recommendations · 3 citations · 1 critical · Talks

6 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@SonOfLilit Jul 2017 Recommends
on HN thread Ask HN: Software licensing excluding military use?
David Crockford puts a "don't use this for evil" clause in the license for all software he releases, creating some interesting situations: [this video] (2:44 and worth it)
Short clip on Crockford's no-evil license and the situations it created.

Citations, criticism and jokes

@rogerbinns May 2013 Cites it
on HN thread Show HN: What do you think of this short End User Licensing Agreement?
Read more
That doesn't work at all if it is the actual wording. For point 1 you can find warranty wording in any number of open source or creative commons licenses. For the second, objectionable requires a definition. For example many would consider the US drone assassination program objectionable, and hence tar US companies and people with the same brush. Does that mean US companies and people can use the software? How many steps do they have to be removed (eg is providing the payroll software to the defense contractor a problem?) [link] [this video] Because of copyright laws, people can do virtually nothing with software. If you actually want to give the user freedoms - see [link] - then pick a well known free software license since it will have already addressed all these issues.
@easton Apr 2021 Cites it
on HN thread SQLite Plus: Missing SQLite functions
That's what I was talking about. Crawford said in a talk he had to make an amended licenses for corporations (namely, IBM), who had lawyers that needed to be able to get around the evil restriction. [this video]
Crockford made an amended license for IBM's lawyers.
@btilly Nov 2023 Pushes back
on HN thread In the bad old days we had Punchcards. How did people deal with that?
When you know that history, IBM asking for an exemption to the JSLint license becomes less funny. Watch [this video] (2 minutes) to hear the story from the developer's point of view. Then consider how many totalitarian states today are using IBM computers to track their population. The developer might not realize it, but IBM lawyers absolutely know that they can be fairly accused of using JSLint for evil.

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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