How to upload and read CSV files in React.js?

Question

I would like the user to upload a .csv file, and then have the browser be able to parse the data from that file. I am using ReactJS. How would this work? Thanks.

Answer 1

I would use Papa Parse (https://www.npmjs.com/package/papaparse). And here is an example react component:

class FileReader extends React.Component {
  constructor() {
    super();
    this.state = {
      csvfile: undefined
    };
    this.updateData = this.updateData.bind(this);
  }

  handleChange = event => {
    this.setState({
      csvfile: event.target.files[0]
    });
  };

  importCSV = () => {
    const { csvfile } = this.state;
    Papa.parse(csvfile, {
      complete: this.updateData,
      header: true
    });
  };

  updateData(result) {
    var data = result.data;
    console.log(data);
  }

  render() {
    console.log(this.state.csvfile);
    return (
      

        
Import CSV File!
         {
            this.filesInput = input;
          }}
          name="file"
          placeholder={null}
          onChange={this.handleChange}
        />
        

         Upload now!
      
    );
  }
}

export default FileReader;