Convert a JSON key-value file URL to Netlify _redirects file

README.md

JSON KV to Netlify Redirects

Using npx with Node.js, you can run GitHub Gist scripts. This is a script to

Usage

For example, if you have a JSON file in a repo and its URL is https://raw.githubusercontent.com/TwenteMe/data/master/redirects.json, use:

npx https://gist.github.com/AnandChowdhary/bf1dce1400a6fc86afd1921085feff93 https://raw.githubusercontent.com/TwenteMe/data/master/redirects.json

This will generate a _redirects file for server-side redirects on Netlify.

index.js

#!/usr/bin/env node

const fs = require("fs");
const http = require("http");
const https = require("https");

const URL = process.argv[process.argv.length - 1];

/**
 * getJSON: RESTful GET request returning JSON object(s)
 * @param options: http options object
 * @param callback: callback to pass the results JSON object(s) back
 * @source https://stackoverflow.com/a/9577651/1656944
 */
const getJSON = (url, onResult) => {
  const port = url.startsWith("https://") ? https : http;
  let output = "";
  const req = port.request({
    host: URL.split("://")[1].split("/")[0],
    path: URL.split("://")[1].replace(URL.split("://")[1].split("/")[0], "")
  }, res => {
    res.setEncoding("utf8");
    res.on("data", chunk => {
      output += chunk;
    });
    res.on("end", () => {
      let obj = JSON.parse(output);
      onResult(res.statusCode, obj);
    });
  });
  req.on("error", err => res.send("ERR " + err.message));
  req.end();
};

console.log("Fetching file...", URL);

let redirects = "";
getJSON(URL, (statusCode, result) => {
  for (const slug in result) {
    redirects += `/${slug} ${result[slug]}\n`;
  }
  fs.writeFileSync("_redirects", redirects);
});

package.json

{
  "name": "json-to-netlify",
  "version": "1.0.0",
  "bin": "./index.js"
}