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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/CanvasRenderingContext2D/strokeStyle below:

CanvasRenderingContext2D: strokeStyle property - Web APIs

CanvasRenderingContext2D: strokeStyle property

Baseline Widely available

The CanvasRenderingContext2D.strokeStyle property of the Canvas 2D API specifies the color, gradient, or pattern to use for the strokes (outlines) around shapes. The default is black.

Note: For more examples of stroke and fill styles, see Applying styles and color in the Canvas tutorial.

Value

One of the following:

color: A string parsed as CSS <color> value.
gradient: A CanvasGradient object (a linear or radial gradient).
pattern: A CanvasPattern object (a repeating image).

Examples Changing the stroke color of a shape

This example applies a blue stroke color to a rectangle.

HTML

<canvas id="canvas"></canvas>

JavaScript

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

ctx.strokeStyle = "blue";
ctx.strokeRect(10, 10, 100, 100);

Result Creating multiple stroke colors using loops

In this example, we use two for loops and the arc() method to draw a grid of circles, each having a different stroke color. To achieve this, we use the two variables i and j to generate a unique RGB color for each circle, and only modify the green and blue values. (The red channel has a fixed value.)

<canvas id="canvas" width="150" height="150"></canvas>

const ctx = document.getElementById("canvas").getContext("2d");

for (let i = 0; i < 6; i++) {
  for (let j = 0; j < 6; j++) {
    ctx.strokeStyle = `rgb(
        0
        ${Math.floor(255 - 42.5 * i)}
        ${Math.floor(255 - 42.5 * j)})`;
    ctx.beginPath();
    ctx.arc(12.5 + j * 25, 12.5 + i * 25, 10, 0, Math.PI * 2, true);
    ctx.stroke();
  }
}

The result looks like this:

Specifications Browser compatibility WebKit/Blink-specific note

In WebKit- and Blink-based browsers, the non-standard and deprecated method ctx.setStrokeColor() is implemented in addition to this property.

setStrokeColor(color);
setStrokeColor(color, alpha);
setStrokeColor(grayLevel);
setStrokeColor(grayLevel, alpha);
setStrokeColor(r, g, b, a);
setStrokeColor(c, m, y, k, a);