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console: add support for %c style formatter in console.log() #29605
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Technically possible but we'd need to bring in a CSS parser, map all the ANSI stuff, etc...
What if we just strip out %c formatting entirely:
> console.log('%cHello World', 'color:green; background:yellow;') Hello WorldReacted by Anna Henningsen and Ruben BridgewaterFor now, I'd say stripping out the %c formatting is the better approach.
- added a commit that references this issue
on Sep 23, 2019 - added a commit that references this issue
on Sep 25, 2019 Is there any interest in pursuing this to make CSS
%ccolors work in Node.js? Deno has this support, so it's already "been done" in the sense that there's public MIT-licensed code that could be used as a how-it-was-already-done example: https://github.com/denoland/deno/blob/306b51d7728a6e28461171d3332a0b3aa8545a6e/ext/console/01_console.js#L2821-L2926I think that what would need to change is here: https://github.com/nodejs/node/blob/main/lib/internal/util/inspect.js#L2263
Reacted by with-heart and stefnotch- added a commit that references this issue
on Jul 27, 2026
Node's console currently supports a number of formatters,
s, j, d, o, O, i, f. However, it doesn't support%c:The same code in Safari, Firefox, and Chrome does this:
The Console spec doesn't give a ton of help on what
%cshould do, other than to say that it "Applies provided CSS."Obviously there are aspects of this that don't make sense in the terminal vs. a browser, but perhaps some of it does? It would be nice if node's
consolecould do more than ignore%c.Apologies if this has come up in the past and been rejected. I wasn't able to find a previous discussion.