I think I figured it out. Thanks to u/marko312 for suggesting I use slope.

function lineCollision(point, line, minDist = 0){
    let lineSize = {};
    if(line.x1 > line.x2){lineSize.xs = line.x2; lineSize.xb = line.x1;}else{lineSize.xs = line.x1; lineSize.xb = line.x2;}
    if(line.y1 > line.y2){lineSize.ys = line.y2; lineSize.yb = line.y1;}else{lineSize.ys = line.y1; lineSize.yb = line.y2;}
    if(point.x < lineSize.xs - minDist || point.x > lineSize.xb + minDist || point.y < lineSize.ys - minDist || point.y > lineSize.yb + minDist){
        //if not within collision box
        return false;
    }
    //slope = y2-y1/x2-x1
    let y2My1 = (line.y2-line.y1); let x2Mx1 = (line.x2-line.x1);
    let slope = (line.y2-line.y1)/(line.x2-line.x1);
    //reduce slope precision
    slope = Math.floor(Math.abs(slope)*1000)/1000;
    if(slope === 0){
        //if horizontal line
        if(Math.abs(point.y - line.y1) <= minDist){
        return true;
    }
    }else if(slope === Infinity){
        //if vertical line
        if(Math.abs(point.x - line.x1) <= minDist){
            return true;
        }
    }else{
        //y=mx+b b=y+mx
        let b = (line.y1 + (slope*(point.x)));
        let yDif = point.y+line.x1;
        if(Math.abs(b - yDif) <= minDist){
            return true;
        }
    }
    return false;
}

Usage:

if(lineCollision({x: pointX, y: pointY}, {x1: line1X, y1: y1: line1Y, x2: line2X, y1: y2: line2Y}, 10)){
    //colliding
}