⚙ SEO & Dev Utility · TechyFlavors
JSON Formatter & Validator
Paste any JSON on the left. It's checked and beautified as you type — invalid JSON points to the exact line and column so you can fix it fast, valid JSON gets a live collapsible tree on the right.
Input
1
Tree view
Valid JSON will render here as an explorable tree.
Common JSON mistakes this catches
Most "invalid JSON" errors come down to a handful of habits carried over from JavaScript object syntax, which JSON doesn't allow.
01
Trailing commas
JavaScript tolerates [1, 2, 3,] — JSON doesn't. Remove the comma after the last item or property.
02
Single quotes & unquoted keys
Keys and string values need double quotes: "key": "value", never 'key': 'value' or key: "value".
03
Comments and
Comments and undefined
JSON has no comments and no undefined — use null, and strip any // or /* */ notes before validating.
