src/app.js

const network = require("./network.json")
const nodes = network.nodes;
const links = network.links;
const node_by_url = new Map(nodes.map(node => [node.id, node]))

const data_array = [];
for (const link of links) {
    const target_node = node_by_url.get(link.source)
    const texts = [node_by_url.get(link.target).title].concat(node_by_url.get(link.target).body_text.split(/\n|。|./))
        .map(text => text ? text.replace(/\s/g, "") : "")
    if (texts.length > 2) {
        for (const text of texts) {
            if (target_node.title && text) {
                data_array.push({ text: text, title: target_node.title.replace(/,/g, " ") })
            }
        }
    }
}

console.log(JSON.stringify(data_array));