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Pretty Printing JSON with React

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醉酒成梦
醉酒成梦 2020-12-23 14:23

I\'m using ReactJS and part of my app requires pretty printed JSON.

I get some JSON like: { \"foo\": 1, \"bar\": 2 }, and if I run that through

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  • 庸人自扰
    2020-12-23 14:39

    Just to extend on the WiredPrairie's answer a little, a mini component that can be opened and closed.

    Can be used like:

    <Pretty data={this.state.data}/>


    export default React.createClass({

    style: {
        backgroundColor: '#1f4662',
        color: '#fff',
        fontSize: '12px',
    },

    headerStyle: {
        backgroundColor: '#193549',
        padding: '5px 10px',
        fontFamily: 'monospace',
        color: '#ffc600',
    },

    preStyle: {
        display: 'block',
        padding: '10px 30px',
        margin: '0',
        overflow: 'scroll',
    },

    getInitialState() {
        return {
            show: true,
        };
    },

    toggle() {
        this.setState({
            show: !this.state.show,
        });
    },

    render() {
        return (
            <div style={this.style}>
                <div style={this.headerStyle} onClick={ this.toggle }>
                    <strong>Pretty Debug</strong>
                </div>
                {( this.state.show ?
                    <pre style={this.preStyle}>
                        {JSON.stringify(this.props.data, null, 2) }
                    </pre> : false )}
            </div>
        );
    }
});

    Update

    A more modern approach (now that createClass is on the way out)

    import styles from './DebugPrint.css'

import autoBind from 'react-autobind'
import classNames from 'classnames'
import React from 'react'

export default class DebugPrint extends React.PureComponent {
  constructor(props) {
    super(props)
    autoBind(this)
    this.state = {
      show: false,
    }
  }    

  toggle() {
    this.setState({
      show: !this.state.show,
    });
  }

  render() {
    return (
      <div style={styles.root}>
        <div style={styles.header} onClick={this.toggle}>
          <strong>Debug</strong>
        </div>
        {this.state.show 
          ? (
            <pre style={styles.pre}>
              {JSON.stringify(this.props.data, null, 2) }
            </pre>
          )
          : null
        }
      </div>
    )
  }
}

    And your style file

    .root { backgroundColor: '#1f4662'; color: '#fff'; fontSize: '12px'; }

    .header { backgroundColor: '#193549'; padding: '5px 10px'; fontFamily: 'monospace'; color: '#ffc600'; }

    .pre { display: 'block'; padding: '10px 30px'; margin: '0'; overflow: 'scroll'; }

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  • 眼角桃花
    2020-12-23 14:45

    The 'react-json-view' provides solution rendering json string.

    import ReactJson from 'react-json-view';
<ReactJson src={my_important_json} theme="monokai" />
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  • 无人及你
    2020-12-23 14:45 
    const getJsonIndented = (obj) => JSON.stringify(newObj, null, 4).replace(/["{[,\}\]]/g, "")

const JSONDisplayer = ({children}) => (
    <div>
        <pre>{getJsonIndented(children)}</pre>
    </div>
)

    Then you can easily use it: 

    const Demo = (props) => {
   ....
   return <JSONDisplayer>{someObj}<JSONDisplayer>
}
    0 讨论(0)
  • 野的像风
    2020-12-23 14:45

    Here is a demo react_hooks_debug_print.html in react hooks that is based on Chris's answer. The json data example is from https://json.org/example.html.

    <!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Hello World</title>
    <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>

    <!-- Don't use this in production: -->
    <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
  </head>
  <body>
    <div id="root"></div>
    <script src="https://raw.githubusercontent.com/cassiozen/React-autobind/master/src/autoBind.js"></script>

    <script type="text/babel">

let styles = {
  root: { backgroundColor: '#1f4662', color: '#fff', fontSize: '12px', },
  header: { backgroundColor: '#193549', padding: '5px 10px', fontFamily: 'monospace', color: '#ffc600', },
  pre: { display: 'block', padding: '10px 30px', margin: '0', overflow: 'scroll', }
}

let data = {
  "glossary": {
    "title": "example glossary",
    "GlossDiv": {
      "title": "S",
      "GlossList": {
        "GlossEntry": {
          "ID": "SGML",
          "SortAs": "SGML",
          "GlossTerm": "Standard Generalized Markup Language",
          "Acronym": "SGML",
          "Abbrev": "ISO 8879:1986",
          "GlossDef": {
            "para": "A meta-markup language, used to create markup languages such as DocBook.",
            "GlossSeeAlso": [
              "GML",
              "XML"
            ]
          },
          "GlossSee": "markup"
        }
      }
    }
  }
}

const DebugPrint = () => {
  const [show, setShow] = React.useState(false);

  return (
    <div key={1} style={styles.root}>
    <div style={styles.header} onClick={ ()=>{setShow(!show)} }>
        <strong>Debug</strong>
    </div>
    { show 
      ? (
      <pre style={styles.pre}>
       {JSON.stringify(data, null, 2) }
      </pre>
      )
      : null
    }
    </div>
  )
}

ReactDOM.render(
  <DebugPrint data={data} />, 
  document.getElementById('root')
);

    </script>

  </body>
</html>

    Or in the following way, add the style into header:

        <style>
.root { background-color: #1f4662; color: #fff; fontSize: 12px; }
.header { background-color: #193549; padding: 5px 10px; fontFamily: monospace; color: #ffc600; }
.pre { display: block; padding: 10px 30px; margin: 0; overflow: scroll; }
    </style>

    And replace DebugPrint with the follows:

    const DebugPrint = () => {
  // https://stackoverflow.com/questions/30765163/pretty-printing-json-with-react
  const [show, setShow] = React.useState(false);

  return (
    <div key={1} className='root'>
    <div className='header' onClick={ ()=>{setShow(!show)} }>
        <strong>Debug</strong>
    </div>
    { show 
      ? (
      <pre className='pre'>
       {JSON.stringify(data, null, 2) }
      </pre>
      )
      : null
    }
    </div>
  )
}
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  • 逝去的感伤
    2020-12-23 14:49

    You'll need to either insert BR tag appropriately in the resulting string, or use for example a PRE tag so that the formatting of the stringify is retained:

    var data = { a: 1, b: 2 };

var Hello = React.createClass({
    render: function() {
        return <div><pre>{JSON.stringify(data, null, 2) }</pre></div>;
    }
});

React.render(<Hello />, document.getElementById('container'));

    Working example.

    Update

    class PrettyPrintJson extends React.Component {
    render() {
         // data could be a prop for example
         // const { data } = this.props;
         return (<div><pre>{JSON.stringify(data, null, 2) }</pre></div>);
    }
}

ReactDOM.render(<PrettyPrintJson/>, document.getElementById('container'));

    Example

    Stateless Functional component, React .14 or higher

    const PrettyPrintJson = ({data}) => {
    // (destructured) data could be a prop for example
    return (<div><pre>{ JSON.stringify(data, null, 2) }</pre></div>);
}

    Or, ...

    const PrettyPrintJson = ({data}) => (<div><pre>{ 
    JSON.stringify(data, null, 2) }</pre></div>);

    Working example

    Memo / 16.6+

    (You might even want to use a memo, 16.6+)

    const PrettyPrintJson = React.memo(({data}) => (<div><pre>{
    JSON.stringify(data, null, 2) }</pre></div>));
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