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Cover image for Make line breaks work when you render text in a React or Vue component
Cassidy Williams
Cassidy Williams

Posted on • Edited on • Originally published at cassidoo.co

Make line breaks work when you render text in a React or Vue component

Sometimes you will get a string that you can't control in your React components (like from a CMS or API). It might look something like this:

"Wow I am so cool \n I'm a JavaScript haiku \n render my newlines"
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But, those little \n characters aren't respected if you were to put it into a React (or Vue) component, like this:

const haiku = "Wow I am so cool \n I'm a JavaScript haiku \n render my newlines"

function BeautifulHaiku() {
  return <div>{haiku}</div>
}
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If you want to change this behavior and get the newlines you want, you have a couple solid options.

Replace \n with <br />

The first thing you can do is split up the string and then render the resulting <br /> tags.

function replaceWithBr() {
  return haiku.replace(/\n/g, "<br />")
}
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In React, you'd then use dangerouslySetInnerHTML to make that work:

<p dangerouslySetInnerHTML={{__html: replaceWithBr()}} />
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(this is named "dangerous" for a reason, and it's not because the React team wants to seem cool, it's because you gotta be careful about what you put in there to avoid malicious scripts)

And in Vue, you'd use v-html to make that work:

<p v-html="replaceWithBr()">{{haiku}}</p>
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Use CSS white-space

The other way you can do this is by using the white-space CSS property and set it to either pre-wrap or pre-line.

.css-fix {
  white-space: pre-wrap; /* or pre-line */
}
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These two make sure that the text wraps when line breaks are in the content, and pre-line specifically collapses multiple whitespaces into one.

This can be applied to both React and Vue!

Prove it, Cassidy

Fine, twist my arm!

Here's the React examples in action:

And here's the Vue examples!

"They're different but they're friends" - DJ Khaled

Full disclosure: I am not a Vue developer, this just happened to work for me when I tried it. I know this is "proper" in React but I can't speak for Vue because I am a noob. Good luck, have fun, make good choices, be kind, write code.

I hope this was helpful for you!

Top comments (11)

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sereneinserenade profile image
Jeet Mandaliya • Edited

It was a great read, thanks.

A bit of addition: In Vue, one can also do. Codesandbox: codesandbox.io/s/demo-v-html-97ow8e

<p v-html="replaceWithBr(haiku)" />
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cassidoo profile image
Cassidy Williams

Ahhh I was wondering if that was a thing but didn't bother trying, thanks for sharing!

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kissu profile image
Konstantin BIFERT

True. Don't forget to sanitize it if it can come from a user input (to avoid malicious code).

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britt_joiner profile image
Brittany Joiner

Thanks Cassidy! I have an issue to work on that I basically need to do this (swap out one tag for another), but my team wants me to try to avoid using ‘dangerouslySetInnerHTML’. This gives me the idea to see if css can do anything for me, but I worry it might not because it’s not a white space issue (I’m actually trying to swap tags with a specific component we have for highlighting text.) I’ll play around with it some more!

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alifallahrn profile image
Ali Fallah

That's great! Thanks for sharing it with us

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maarlon1 profile image
Maarlon1

Thanks, .css-fix with white-space attribute works with Vue3, thanks (after I have spent the whole afternoon trying to find a solution). v-HTML is not recommended because of the malicious code injection possibility.

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komilovtemur profile image
Temur Komilov

react-dom.development.js:12056 Uncaught TypeError: Cannot read properties of undefined (reading 'replace')
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cassidoo profile image
Cassidy Williams

You're not passing the body variable to your function!

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saiafonua profile image
Saia Fonua

Thanks Cassidy! I appreciate it

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iainsimmons profile image
Iain Simmons

Or you make an array by splitting the strings and then insert the br tags wherever you need.

I'd do it with flatMap:
https://codesandbox.io/s/young-bash-4vevii?from-embed=&file=/src/App.js

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dihnauer profile image
Diogo Hanauer

That's great! Thanks. ❤