Chart.js Developers

Last Updated : 28 Apr, 2025

Chart.js, a powerful JavaScript library, has become a go-to tool for developers seeking to visualize data in a dynamic and aesthetically pleasing manner. With its versatility, ease of use, and a vibrant community of developers, Chart.js has evolved into more than just a charting library – it's a platform for creative expression and data storytelling. In this article, we will look into various aspects of Chart.js development, from APIs and new axes to contributing, plugins, and publishing extensions.

Developers: It is developed and maintained by a community of developers, making it a collaborative project. The source code and documentation can be found on GitHub, allowing developers to contribute and participate in discussions.
API: Chart.js provides a well-defined API (Application Programming Interface) that allows developers to create and customize charts programmatically. The API includes methods and options to configure chart elements, styles, and behaviors. It supports various chart types, including line charts, bar charts, radar charts, pie charts, and more.
New AXES: Chart.js periodically introduces updates and new features to enhance its functionality. "New AXES" could refer to improvements or additions to the axes (like X and Y axes) in the library. Developers can refer to the official documentation or release notes for information on the latest axes-related features.
New Charts: Similar to new axes, "New Charts" refers to the introduction of additional chart types or improvements to existing ones. Chart.js evolves to meet the needs of developers and users, expanding the range of available visualizations.
Contributing: Chart.js is an open-source project that welcomes contributions from the community. Developers can contribute by submitting bug reports, and feature requests, or by actively participating in the development process. Guidelines for contributing are typically outlined in the project's repository on GitHub.
Plugins: Chart.js supports a plugin system, allowing developers to extend its functionality. Plugins can be used to add custom chart types, animations, or other features not available in the core library. The Chart.js community actively develops and shares plugins to enhance the library's capabilities.
Publishing an Extension: If developers create a custom extension or plugin for Chart.js, they may choose to publish it for others to use. Publishing an extension involves sharing the code, documentation, and potentially making it available through package managers like npm.
TypeDoc: TypeDoc is a tool used to automatically generate TypeScript documentation from annotated source code. For a project like Chart.js, TypeDoc may be utilized to provide comprehensive documentation for TypeScript users.
Updating Charts: Regular updates to Chart.js may include bug fixes, performance improvements, and new features. Users are encouraged to stay updated with the latest releases to benefit from improvements and ensure compatibility with the latest technologies.

Example 1: In this example, we are using .update() to refresh the chart after changing its data.

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1.0">
    <title>Chart.js Update Example</title>

    <script src=
"https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>

<body>
    <canvas id="myLineChart" width="400" 
            height="200"></canvas>

    <script>

        let ctx = document.getElementById('myLineChart')
            .getContext('2d');


        let lineChart = new Chart(ctx, {
            type: 'line',
            data: {
                labels: ['January', 'February',
                    'March', 'April', 'May'],
                datasets: [{
                    label: 'My Dataset',
                    data: [10, 20, 30, 40, 50],
                    borderColor: 'blue',
                    borderWidth: 2,
                    fill: false
                }]
            },
            options: {
                scales: {
                    y: {
                        beginAtZero: true
                    }
                }
            }
        });

        // Update data point at index 2 to 50
        lineChart.data.datasets[0].data[2] = 50;

        // 'active': Used for active updates.
        lineChart.update('active');

    </script>
</body>

</html>

Output:

Screenshot-(36)

Example 2: In this example, we are using .resize() to change the width and height of the chart.

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1.0">
    <title>Chart.js Resize Example</title>

    <script src=
"https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>

<body>
    <canvas id="myLineChart" width="400" 
            height="200"></canvas>

    <script>
        let ctx = document.getElementById('myLineChart')
            .getContext('2d');

        let lineChart = new Chart(ctx, {
            type: 'line',
            data: {
                labels: ['January', 'February',
                    'March', 'April', 'May'],
                datasets: [{
                    label: 'My Dataset',
                    data: [10, 20, 30, 40, 50],
                    borderColor: 'blue',
                    borderWidth: 2,
                    fill: false
                }]
            },
            options: {
                scales: {
                    y: {
                        beginAtZero: true
                    }
                }
            }
        });


        lineChart.resize(600, 300); 
    </script>
</body>

</html>

Output:

Screenshot-(42)

Chart.js Plugins Developer

rudra1807raj

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Chart.js Developers

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