Objects are not valid as a React child If you meant to render a collection of children use an array instead

Question

I am setting up a React app with a Rails backend  I am getting the error  Objects are not valid as a React child  found  object with keys  id  name  info  created at  updated at    If you meant to render a collection of children  use an array instead    This is what my data looks like                    id   1           name    Home Page            info    This little bit of info is being loaded from a Rails          API             created at    2018-09-18T16 39 22 184Z            updated at    2018-09-18T16 39 22 184Z            My code is as follows   import React from  react    class Home extends React Component      constructor props        super props       this state           error  null        isLoaded  false        homes                   componentDidMount         fetch  http   localhost 3000 api homes          then res   gt  res json           then           result    gt              this setState               isLoaded  true              homes  result                                     error handler          error    gt              this setState               isLoaded  true              error                                        render          const   error  isLoaded  homes     this state       if  error          return            lt div className  col  gt            Error   error message           lt  div gt                 else if   isLoaded          return            lt div className  col  gt            Loading             lt  div gt                 else         return            lt div className  col  gt             lt h1 gt Mi Casa lt  h1 gt             lt p gt This is my house y all  lt  p gt             lt p gt Stuff   homes  lt  p gt           lt  div gt                        export default Home    What am I doing wrong

User · Answer

Although not specific to the answer  this error mostly occurs when you mistakenly using a JavaScript expression inside a JavaScript context using    For example let x 5   export default function App    return   x         Correct way to do this would be let x 5  export default function App    return  x

User · Answer

I had this issue when I was trying to render an object on a child component that was receiving props  I fixed this when I realized that my code was trying to render an object and not the object key s value that I was trying to render

User · Answer

Had the same issue  In my case I had  1  Parse the string into Json 2  Ensure that when I render my view does not try to display the whole object  but object value  data            id   1       name    Home Page        info    This little bit of info is being loaded from a Rails      API         created at    2018-09-18T16 39 22 184Z        updated at    2018-09-18T16 39 22 184Z      var jsonData   JSON parse data    Then my view  return    lt View style  styles container  gt     lt FlatList     data  jsonData      renderItem     item      gt   lt Item title  item name    gt       keyExtractor  item   gt  item id      gt   lt  View gt      Because I m using an array  I used flat list to display  and ensured I work with object value  not object otherwise you ll get the same issue

User · Answer

I hope it will help someone else   This error seems to occur also when you UNintentionally send an object to React child components    Example of it is passing to child component new Date          as follows    const data    name   ABC   startDate  new Date  2011-11-11           lt GenInfo params  data   gt    If you send it as value of a child component parameter you would be sending a complex Object and you may get the same error as stated above   Check if you are passing something similar  that generates Object under the hood

User · Answer

In My case  I had a added async at app js like shown below  const App   async     gt    return   lt Text gt Hello world lt  Text gt       But it was not necessary  when testing something I had added it and it was no longer required  After removing it  as shown below  things started working   const App       gt        return       lt Text gt Hello world lt  Text gt

User · Answer

I faced same issue but now i am happy to resolve this issue   npm i core-js put this line into the first line of your index js file  import core-js

User · Answer

Well in my case the data which I wanted to render contained an Object inside that of the array so due to this it was giving error  so for other people out there please check your data also once and if it contains an object  you need to convert it to array to print all of its values or if you need a specific value then use   My data     body    d fvsdv   photo   http   res cloudinary com imvr7 image upload v1591563988 hhanfhiyalwnv231oweg png   postedby    id   5edbf948cdfafc4e38e74081   name   vit           this is the object I am talking about   title   c sx      v  0   id   5edd56d7e64a9e58acfd499f   proto  Object  To Print only a single value   lt h5 gt  item postedby name  lt  h5 gt

User · Answer

I got the same error today but with a different scenario as compared to the scenario posted in this question  Hope the solution to below scenario helps someone   The render function below is sufficient to understand my scenario and solution    render         let orderDetails   null      if this props loading           orderDetails    lt Spinner   gt             if this props orders length    0           orderDetails   null            orderDetails              lt div gt                                this props orders map order   gt                     lt Order                      key  order id                      ingredient  order ingredients                      price  order price    gt                                            lt  div gt             return orderDetails      In above code snippet   If return orderDetails is sent as return  orderDetails  then the error posted in this question pops up despite the value of  orderDetails   value as  lt Spinner  gt  or null or JSX related to  lt Order   gt  component    Error description   react-dom development js 57 Uncaught Invariant Violation  Objects are not valid as a React child  found  object with keys  orderDetails    If you meant to render a collection of children  use an array instead   We cannot return a JavaScript object from a return call inside the render   method  The reason being React expects a component or some JSX or null to render in the UI and not some JavaScript object that I am trying to render when I use return  orderDetails  and hence get the error as above

User · Answer

In JavaScript  arrays and collections are different  although they are somewhat similar  but here the react needs an array  You need to create an array from the collection and apply it   let homeArray   new Array homes length   let i   0  for  var key in homes        homeArray i     homes key       i   i   1

User · Answer

I also occured the error and I sloved it by removing the curly braces hope it will help someone else  You can see that  I did not put the con in the curly brace and the error occured  when I remove the burly brace   the error disappeared  const modal    props    gt    const   show  onClose     props   let con    lt div className  quot modal quot  onClick  onClose  gt           props children           lt  div gt    return show     true          con             lt div gt hello lt  div gt      There are an article about the usage of the curly brace click here

User · Answer

Had the same error but with a different scenario  I had my state as         this state             date  new Date          so when I was asking it in my Class Component I had p gt Date    this state date  lt  p gt   Instead of p gt Date    this state date toLocaleDateString    lt  p gt

User · Answer

I had a similar error while I was creating a custom modal  const CustomModal    visible  modalText  modalHeader    gt      Problem was that I didn t wrap my values to curly brackets like this  const CustomModal     visible  modalText  modalHeader     gt      If you have multiple values to pass to the component  you should use curly brackets around it

User · Answer

In your state  home is initialized as an array homes     In your return  there is an attempt to render home  which is an array    lt p gt Stuff   homes  lt  p gt  Cannot be done this way --- If you want to render it  you need to render an array into each single item  For example  using map   Ex   home map item  gt item

User · Answer

Your data homes is an array  so you would have to iterate over the array using Array prototype map   for it to work   return        lt div className  col  gt         lt h1 gt Mi Casa lt  h1 gt         lt p gt This is my house y amp apos all  lt  p gt         homes map home   gt   lt div gt  home name  lt  div gt         lt  div gt

User · Answer

Just to add to the other options  I was trying to access a nested object within the main object through the dot method as in  this state arrayData CompleteAdress Location In this case Location is a nested object inside Complete address which is why i cant simply access it with the dot notation   So if you re facing this same issue  try JSON parse so that you access the nested object and then manipulate accordingly

[javascript] Objects are not valid as a React child. If you meant to render a collection of children, use an array instead

Examples related to javascript

Examples related to arrays

Examples related to reactjs