OC Log Prettifier

oc-log-view.ts

// deno run --allow-read json-log-view.ts log.txt

import { red, bold } from "https://deno.land/std@0.145.0/fmt/colors.ts";

const text = await Deno.readTextFile(Deno.args[0]);
const lines = text.split(/\r?\n/).filter(l => l.length > 0);
const objs = lines.map(l => {
  const res = JSON.parse(l);
  if (res.message.includes('{\"Exception\"')) {
    res.message = JSON.parse(res.message.replace(/^[^{]+/, ''));
  }
  if (res.message?.Trace) {
    res.message.Trace = res.message.Trace.replace('\n', "\n");
  }
  return res;
});

function printObj(obj: Record<string, string | number | Record<string, string | number>>, indent = 0) {
  Object.entries(obj).forEach(([key, val]) => {
    key = bold(key);
    if (obj.level && obj.level >= 3) {
      key = red(key);
    }

    if (typeof val === 'object') {
      console.log("    ".repeat(indent) + key + ':');
      printObj(val, indent + 1);
    } else {
      let res = val;
      if (typeof val === 'string') {
        const lines = val.split(/\r?\n/);
        if (lines.length === 1) {
          res = lines[0];
        } else {
          res = lines.reduce((res: string, line: string) => res += "    ".repeat(indent + 1) + line + "\n", "\n");
          res = res.slice(0, -1);
        }
      }
      console.log("    ".repeat(indent) + key + ':', res);
    }
  });
}

objs.forEach(obj => {
  printObj(obj);
  console.log("");
});