Utility template
JSON Formatter & Validator
Format and validate JSON instantly in your browser, with readable errors when something is wrong.
Category: Web
Tool interface
JSON input
Paste JSON to format it, validate its structure, and inspect errors instantly.
Paste JSON to validate and format it.
Input JSON
Paste an object, array, or JSON response here.
Formatted result
Valid JSON is pretty-printed with two-space indentation.
Privacy
JSON validation and formatting happen locally in your browser. Your data is never uploaded.
Why this template exists
Every utility uses the same foundation so new tools stay consistent across navigation, accessibility, mobile layout, and SEO.
How it works
Paste JSON into the input area and Utiliful parses it locally in your browser, showing either formatted output or a readable validation error.