Generate Chart

Generate a chart image using Chart.js. Supports line, bar, pie, doughnut, radar, polarArea, bubble, and scatter chart types.

Security Scan

The skill is an instruction-only wrapper that posts Chart.js data to a third-party chart-generation API (pdfapihub.com); its requirements and instructions are consistent with that purpose, but using it will send your chart data to an external service so verify privacy and API-key handling first.

Purpose & Capability

Name, description, SKILL.md, example.json, and skill.json consistently describe a chart-generation API using Chart.js served by pdfapihub.com. The declared API auth header (CLIENT-API-KEY) is appropriate for this purpose.

Instruction Scope

Runtime instructions are narrowly scoped: they show how to POST chart_type, data, options, and sizing to the external API and how to include CLIENT-API-KEY. The instructions do not request unrelated files, system paths, or extra credentials.

Install Mechanism

There is no install step and no code to execute locally (instruction-only). This minimizes filesystem risk; nothing is downloaded or written by the skill itself.

Credentials

The skill requires an API key (CLIENT-API-KEY) to call the third-party service (skill.json marks auth required). The registry metadata shows no required environment variables, which is consistent for an instruction-only skill, but users must supply an API key when calling the API. This is proportionate to the stated function, but remember the API key grants access to a remote service and should be handled as a secret.

Persistence & Privilege

always is false and the skill is user-invocable; it does not request permanent presence or elevated platform privileges. It does not modify other skills or system-wide configuration.

Assessment

This skill simply sends your Chart.js configuration and data to https://pdfapihub.com to get a generated image. Before using it, verify the legitimacy and privacy/retention policy of pdfapihub.com, avoid sending sensitive or personally identifying data to the third-party service, and treat the CLIENT-API-KEY like any secret (use a dedicated key, do not reuse keys across unrelated services, and rotate/revoke if compromised). Test with non-sensitive/dummy data first. If you need chart generation entirely under your control, consider a local/server-side Chart.js renderer instead of a third-party API.

What It Does

Creates a chart image using the Chart.js library. Supports bar, line, pie, doughnut, radar, polarArea, bubble, and scatter chart types with full Chart.js data and options configuration.

When to Use

• Generate data visualization charts programmatically
• Create chart images for reports, dashboards, or emails
• Produce charts without a browser or frontend

Required Inputs

• chart_type — one of: line, bar, pie, doughnut, radar, polarArea, bubble, scatter
• data — Chart.js data object with labels and datasets

Authentication

Send your API key in the CLIENT-API-KEY header.

Get your free API key at https://pdfapihub.com. Full API documentation is available at https://pdfapihub.com/docs.

Use Cases

• Dashboard Reports — Generate chart images for PDF/email reports without a browser
• Sales Analytics — Create bar/line charts showing revenue, growth, or conversion trends
• Survey Results — Visualize poll or survey data as pie/doughnut charts
• Financial Reports — Produce stock performance or budget allocation charts
• Project Metrics — Generate sprint velocity, burn-down, or team performance charts
• Newsletter Content — Embed data visualizations directly in email newsletters
• Slack/Discord Bots — Generate chart images on-the-fly for chatbot responses

Key Options

Parameter	Description
chart_type	Type of chart (bar, line, pie, etc.)
data	Chart.js data config (labels + datasets)
options	Chart.js options (title, legend, scales)
width / height	Chart dimensions in pixels
output_format	url (default), base64, both, image

Example Usage

curl -X POST https://pdfapihub.com/api/v1/generateChart \
  -H "CLIENT-API-KEY: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "chart_type": "bar",
    "data": {
      "labels": ["Q1", "Q2", "Q3", "Q4"],
      "datasets": [{
        "label": "Revenue",
        "data": [120000, 150000, 180000, 200000],
        "backgroundColor": "rgba(54, 162, 235, 0.6)"
      }]
    },
    "options": { "plugins": { "title": { "display": true, "text": "Quarterly Revenue" } } },
    "width": 800,
    "height": 500,
    "output_format": "url"
  }'