Console - Bun

Bun provides a browser- and Node.js-compatible console global. This page only documents Bun-native APIs.

Object inspection depth

You can configure how deeply console.log() prints nested objects:

CLI flag: Use --console-depth <number> to set the depth for a single run

Configuration: Set console.depth in your bunfig.toml to persist it across runs

Default: Objects are inspected to a depth of 2 levels

const nested = { a: { b: { c: { d: "deep" } } } };
console.log(nested);
// Default (depth 2): { a: { b: { c: [Object ...] } } }
// With depth 4: { a: { b: { c: { d: 'deep' } } } }

The CLI flag takes precedence over the configuration file setting.

Reading from stdin

In Bun, the console object is also an AsyncIterable that reads process.stdin line by line.

adder.ts

for await (const line of console) {
  console.log(line);
}

Use this for interactive programs, like the following addition calculator.

adder.ts

console.log(`Let's add some numbers!`);
console.write(`Count: 0\n> `);

let count = 0;
for await (const line of console) {
  count += Number(line);
  console.write(`Count: ${count}\n> `);
}

To run the file:

terminal

bun adder.ts
Let's add some numbers!
Count: 0
> 5
Count: 5
> 5
Count: 10
> 5
Count: 15

​Object inspection depth

​Reading from stdin

Object inspection depth

Reading from stdin