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Financial · katucharts.js/finance

Technical Indicators

type: 'indicators'

Declarative technical indicators added as series via type + linkedTo + params, computed from the linked series. Overlays (SMA, EMA, WMA, DEMA, TEMA, Bollinger, VWAP, Ichimoku, PSAR) share the price axis; oscillators (RSI, MACD, Stochastic, ATR, CCI, ROC, Momentum, ADX) sit in their own pane via a stacked yAxis.

Edit the JSON on the right and press Run (or ⌘/Ctrl + Enter) — data, titles, categories and colors all update live.

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Technical Indicators
Edit · JSON

Data format

indicator series carry no data — they read the linkedTo series

Data shape

The JSON you pass inside the chart — drop it straight into your series.

series: [
  { id: 'px', type: 'candlestick', data: [/* OHLC */] },
  { type: 'sma', linkedTo: 'px', params: { period: 14 } },
  { type: 'bollinger', linkedTo: 'px', params: { period: 20, stdDev: 2 } }
]

Example

import KatuCharts from 'katucharts.js';
import 'katucharts.js/finance';

KatuCharts.chart('container', {
  series: [
    { id: 'px', type: 'candlestick', data: ohlc },
    { type: 'sma', linkedTo: 'px', params: { period: 14 } },
    { type: 'bollinger', linkedTo: 'px', params: { period: 20, stdDev: 2 } }
  ]
});

Type-specific options

OptionDescription
typesma | ema | wma | dema | tema | rsi | macd | stochastic | bollinger | atr | vwap | obv | vbp | ichimoku | cci | roc | momentum | adx | psar
linkedToid of the price series to compute from.
paramsIndicator parameters, e.g. { period: 20, stdDev: 2 }.
yAxisIndex of a stacked pane axis for oscillators.

Common errors

Why does my technical indicators chart render as a line chart?
The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?
The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?
The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

FAQ

How do I create a technical indicators chart in JavaScript?
Install with `npm install katucharts.js`, import the module with `import 'katucharts.js/finance';`, then call KatuCharts.chart(container, { chart: { type: 'indicators' }, series: [...] }).
Why does my technical indicators chart render as a line chart?
The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?
The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?
The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.
Common options (color, visible, marker, dataLabels, animation, events, zones…) apply to every type — see Configuration → series. See it rendered in the gallery.