Do not forget to implement Array.find when working with the useSWR hook in Next.js

Question

Do not forget to implement Array.find when working with the useSWR hook in Next.js

I have the following code:

const fetcher = (url: string) => axios.get(url).then((r) => r.data);

const {data} = useSWR("api/data", fetcher, {refreshInterval: 10000})
console.log(data.find(d => d.id === "123"))

The API path is as follows:

const promises = matchString.split(",").map(async (match: string) => {
    try {
      events.push(await Events.find({ name: match }).then((res) => res[0]))
    } catch (error) {
      events.push(error)
      console.log("model/route.js error")
    }
  })
  await Promise.all(promises)
  return new Response(JSON.stringify(events), { status: 200 });

However, I encountered the error message:

TypeError: Cannot read properties of undefined (reading 'find')

Could someone please help me with resolving this issue?

javascript next.js

Answer 1

Answer №1

Always verify the data before using the find() method.

const {data, error} = useSWR("api/data", fetcher, {refreshInterval: 10000});

// check for any errors first
if(error) return <h1>`Oops! Something went wrong: ${error}`</h1>

// if there is no data available yet, show a loading message
if(!data) return <h1>Loading...</h1>

console.log(data.find(d => d.id === "123"));

Answer 2

Always verify the data before using the find() method.

const {data, error} = useSWR("api/data", fetcher, {refreshInterval: 10000});

// check for any errors first
if(error) return <h1>`Oops! Something went wrong: ${error}`</h1>

// if there is no data available yet, show a loading message
if(!data) return <h1>Loading...</h1>

console.log(data.find(d => d.id === "123"));

Answer 3

Answer №2

Experiment with the filter() function to manipulate arrays

Give this a shot...

const {info} = useSWR("api/info", fetcher, {refreshInterval: 10000})
console.log(info?.filter(i => i.id === "456"));

Answer 4

Experiment with the filter() function to manipulate arrays

Give this a shot...

const {info} = useSWR("api/info", fetcher, {refreshInterval: 10000})
console.log(info?.filter(i => i.id === "456"));

Answer 5

Answer №3

Ensure you consider the loading state in your application. Utilize the useSWR hook which provides an isLoading property to help display a loading indicator while data is being fetched.

Visit the SWR documentation for more information

import useSWR from 'swr'
 
function Profile() {
  const { data, error, isLoading } = useSWR('/api/user', fetcher)
 
  if (error) return <div>failed to load</div>
  if (isLoading) return <div>loading...</div>
  return <div>hello {data.name}!</div>
}

Answer 6

Ensure you consider the loading state in your application. Utilize the useSWR hook which provides an isLoading property to help display a loading indicator while data is being fetched.

Visit the SWR documentation for more information

import useSWR from 'swr'
 
function Profile() {
  const { data, error, isLoading } = useSWR('/api/user', fetcher)
 
  if (error) return <div>failed to load</div>
  if (isLoading) return <div>loading...</div>
  return <div>hello {data.name}!</div>
}

Do not forget to implement Array.find when working with the useSWR hook in Next.js

Answer №1

Answer №2

Answer №3

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