data: Graph formats and libraries

Data are often stored in proprietary or custom formats.
Complex data are often inherently graphs (not chart).
There are many serialization formats for representing graphs.
Domain-specific graph formats are simpler, while often limited to visualization.
General-purpose formats are often verbose not intuitive.
RDF (from semantic web) is most general, specific, and often quite verbose (XML)
while its N3 variant is very compact and simple.

DOT (graph description language) - Wikipedia

undirected

// The graph name and the semicolons are optional
 graph graphname {
     a -- b -- c;
     b -- d;
 }

directed

digraph graphname {
     a -> b -> c;
     b -> d;
 }

Supported Graph Formats


GraphML Format

Graphviz - Wikipedia

Graphviz Online

Viz.js
mdaines/viz.js: A hack to put Graphviz on the web.

Dagre: Graphs in JavaScript

magjac/d3-graphviz: Graphviz DOT rendering and animated transitions using D3

d3-graphviz Demo - bl.ocks.org

graphviz Resources

canviz: graphviz on a canvas

koops/canviz: Fork of Canviz by Ryan Schmidt


Running Graphviz in Javascript

JSON Graph Format Specification Website

jsongraph/json-graph-specification: A proposal for representing graph structure (nodes / edges) in JSON.

{
    "graph": {
        "directed": false,
        "type": "graph type",
        "label": "graph label",
        "metadata": {
            "user-defined": "values"
        },
        "nodes": [
            {
                "id": "0",
                "type": "node type",
                "label": "node label(0)",
                "metadata": {
                    "user-defined": "values"
                }
            },
            {
                "id": "1",
                "type": "node type",
                "label": "node label(1)",
                "metadata": {
                    "user-defined": "values"
                }
            }
        ],
        "edges": [
            {
                "source": "0",
                "relation": "edge relationship",
                "target": "1",
                "directed": false,
                "label": "edge label",
                "metadata": {
                    "user-defined": "values"
                }
            }
        ]
    }
}

alternatives

bruth/json-graph-spec: JSON specification for representing a graph structure


Resource Description Framework - Wikipedia

(RDF N3) Notation3 - Wikipedia

Tutorial 1: Introducing Graph Data

RDF Triple Stores vs. Labeled Property Graphs: What's the Difference? @ Neo4j