Everything You Need to Know About Reactjs Set Props

    Introduction About Reactjs Set Props

    React’s approach towards data flow and manipulation is different from that of other frameworks. This makes it difficult to understand a few concepts like props, state, etc. during the initial stages. React has a component-based library that helps the user interface divide into small reusable pieces. Sometimes components need to share or send data among each other. The process of passing the data between components is handled by reactjs set props.

    “Props” stands for properties in reacting and it is a special keyword. Its work is to pass data from one component to another. Also, the props data is available in read-only mode. Child components are not allowed to change or edit the data coming from parent components. One most important thing to keep in mind is that the flow of data passed with props is unidirectional. This means that props can only be shared from parents to child, not in a reverse way. 

    React Props Validation:

    Props are unidirectional read-only attributes for react components. If they are not used correctly then we can get glitches or issues in the execution of components. Using Props Validation we can improve the stability and efficiency of the react components. Props Validation helps developers improve the bugs and problems that may occur in the future. These tools force the correct usage of the components to react. The react components catch bugs with the help of a special property called PropTypes. This property validates data types of values passed through props. Although there is no compulsion of defining components with propTypes. But it will be beneficial to use propTypes with the react components as it will help resolve or avoid unexpected bugs. 

    ReactJS Set Props Validator

    There are a total of 14 reactjs set props validators in react.

    1. PropTypes.any

    All props are accepted irrespective of their data types.

    2. PropTypes.array

    Props should compulsorily be array.

    3. PropTypes.bool

    Props should compulsorily be a boolean data type.

    4. PropTypes.number

    Props should compulsorily be a number.

    5. PropTypes.function

    Props must be a function.

    6. PropTypes.object

    Props must be an object

    7. PropTypes.string

    Props must be a string.

    8. PropTypes.instanceOf

    It is important for the Props to be an instance of a particular class in JavaScript.

    9. PropTypes.symbol

    Props must be a symbol.

    10. PropTypes.isRequired

    Props for that particular element or any part of the project must be provided.

    11. PropTypes.element

    Props should compulsorily be an element.

    12. PropTypes.node

    Props must be able to render any data types like number, strings, array elements, or anything like these. 

    13. PropTypes.oneOf()

    Among several specified values, props must be one of them. 

    14. PropTypes.oneOfType(PropType.string, PropType.number)

     Here, props must act as an object that could be one of many types.

    How to set props in react?

    Step 1: Defining attributes and values (data) to the Props

    HTML enables us to assign attributes and values to its tags. Similarly, we can also assign the same to react too. React enables us to define our own attributes and assign values within interpolation or curly brackets “{}”. 


    <ChildComponent someAttribute={value}


    Let’s declare a “text” attribute to the ChildComponent and then assign a string value to it. 

    <Childcomponent text={“Prop number 1”}/>

    As we can see our ChildComponent now has a property and a value. Now we need to see how to pass it via Props.

    Step 2: Passing the values or data using props

    It is very simple to pass Props in react components. Just as we pass arguments to function in the same way we pass props. These props bring all the necessary data required for that component. Props are simply arguments passed in React. 


    const ChilComponent= (props) => {

        return <p> Prop number 1. </p>;


    Step 3: Rendering props data

    Till now we have created an attribute and its value. We have also passed it through props. But we don’t have access to it because we haven’t rendered it yet. 

    Here, we will render the prop as an object by using string interpolation i.e. {props}.

    Let us see what it looks like after logging props to the console.

    The output we get is, “”Object { “Prop number 1” }“” 

    Here we can see that props have returned the object. With the help of Dot (.) notation we have access to the object elements in JavaScript. Hence, rendering our text property with interpolation we need to perform,

    const ChildComponent = (props) => {

    return <p> { props.text} </p>;


    This way we can render the data coming from the parent component to the child component. ChildComponent is now able to render its own prop data. Thus following this way, we can convert static components into dynamic ones with the help of the props.


    React has different kinds of data flow as compared to other frameworks. Props are very important in react as they ease the data flow. Props transfer the data in a unidirectional flow parent component to child component whenever necessary. These are special keywords in react used as a short form for properties. Even the data passed via props is only available to the child component in read-only mode. This means that the child component cannot modify the data received from the parent component via prop.

    Props validators are used to validate props to check whether they run smoothly and fix future bugs. There are a total of 14 prop validators available in react.

    Setting or using props is very simple and can be carried out in just 3 steps. First, we need to define attributes and its values. Then we need to pass those attributes using props. Finally, we just need to render those props so that they can be accessed. 


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