December 27, 2019

How to Render an Object in React

Building a `Log` Component
edit

The trick I’m about to show you I learned so early on in my days of learning React that it didn’t dawn on me that others still don’t know it. My apologies, let’s fix that right now.

Have you ever made the mistake of trying to display an object in a React component?

const Component = ({ obj }) => <div>{obj}</div>

And been met with this?

Error message from attempting to render an object

Classic mistake. Don’t worry, we’ve all made it a time or two. We can’t render an object, but we can render strings. What if we turn the object into a string and render it then?

We can do that with JSON.stringify (docs). JSON.stringify takes an object and turns it into a JSON string. We can make a component that does this for us.

// I encourage you to look at the JSON.stringify docs to understand the
// `replacer` and `space` arguments
const Log = ({ value, replacer = null, space = 2 }) => (
  <pre>
    <code>{JSON.stringify(value, replacer, space)}</code>
  </pre>
)

We can now use this component anywhere we would like to display an object in our app. This is very useful for debugging apps.

{
  "name": "Kyle Shevlin",
  "age": 34,
  "location": "Portland, OR"
}

Use this whenever you’d like to display your object in the browser instead of looking at the object value in the console or the devtools.


Finished reading?
Liked the post? Give the author a dopamine boost with a few "beard strokes". Click the beard up to 50 times to show your appreciation.

Kyle Shevlin's face, which is mostly a beard with eyes
Kyle Shevlin is a software engineer who specializes in JavaScript, TypeScript, React and frontend web development.
Agathist
Good software by good people.
Visit https://agath.ist to learn more
Sign up for my newsletter
Let's chat some more about TypeScript, React, and frontend web development. Unsubscribe at any time.
Logo for Data Structures and Algorithms
Data Structures and Algorithms
Check out my courses!
If you enjoy my posts, you might enjoy my courses, too. Click the button to view the course or go to Courses for more information.