I'm trying to migrate Chart.js from 2.9.3 to 3.3.0 and even after applying the the changes () I'm still getting the error:

Error: "category" is not a registered scale.

This is what I have

Chart.register(BarController, DoughnutController, LineController, PieController);

new Chart(this.id, { type: 'bar', data, options: { responsive: true, maintainAspectRatio: false, plugins: { title: { display: options.plugins.title ? true : false, }, tooltip: { mode: 'index', intersect: false }, scales: { x: { stacked: true, gridLines: { drawBorder: false, display: false, }, ticks: { autoSkip: true, maxTicksLimit: 13, }, }, y: { stacked: true, gridLines: { color: '#e6e6e6', drawBorder: false, }, } }
});

What could I be missing here?

6 Answers

Like the error says you are using the category scale so you will need to import and register it like so:

import {CategoryScale} from 'chart.js';
Chart.register(CategoryScale);

Or you can choose to not use treeshaking and import everything like so:

import Chart from '

For all available things you might need to import and register please take a look here:

4

If you are using react-chartjs-2.

Without tree shaking:

import { Chart as ChartJS } from '
import { Chart } from 'react-chartjs-2'

With tree shaking:

import { Chart as ChartJS, CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend,
} from 'chart.js'
import { Chart } from 'react-chartjs-2'
ChartJS.register( CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend
)

1

To use with react-chartjs-2 and import everything; changing chart as chartjs so that it does not show error for importing chart from react chart

import { Chart as ChartJS, registerables } from 'chart.js';
import { Chart } from 'react-chartjs-2'
ChartJS.register(...registerables);

With NextJS I have to use the following, as internally there is a useEffect in the react-chartjs-2 so all needs to be client rendered:

"use client";
import "";
import { Line } from "react-chartjs-2";

I am using Line chart , i faced this issue when update to next.js version , below solution works fine for me, resolved that before destroy() chart error

import Chart from '
import { Line } from "react-chartjs-2";

I struggled a lot with my Nextjs/React project make sure to install WITH the --save flag

npm install --save chart.js react-chartjs-2

I did everything right but this was the problem.

use this exact npm command and then use this code (Bar chart for example), and all should be good:

"use client";
import { useState, useEffect } from "react";
import { Bar } from "react-chartjs-2";
import { Chart as ChartJS } from "";
const BarChart = ({ data }) => { return <Bar data={data} />;
};
export default BarChart;

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