How to Format JSON Online — Free Guide 2026

By SpunkArt13 · March 2026 · SPUNK LLC

Need to format messy JSON? Here's the fastest way.

Method 1: spunk.codes JSON Formatter

Go to spunk.codes/json-formatter
Paste your JSON
Click Format
Copy the beautified output

Features: 2-space or 4-space indent, minify, sort keys, error detection with line numbers.

Method 2: Browser Console

Open DevTools (F12) → Console → type: JSON.stringify(yourObj, null, 2)

Common JSON Errors

Missing quotes around keys
Trailing comma after last item
Single quotes instead of double quotes
Unescaped special characters