JSON Formatter & Beautifier
Paste your JSON to format, beautify, minify, and validate it instantly. Free, no ads, no sign-up.
What is a JSON Formatter?
A JSON formatter is a free online tool that takes raw or minified JSON text and restructures it into a human-readable layout with consistent indentation and line breaks. JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used in APIs and web applications — but minified JSON is difficult to read and debug. A formatter adds whitespace and nesting to reveal the structure clearly.
jsondecode.com's formatter runs entirely in your browser. No JSON data is ever sent to a server, which makes it safe for use with sensitive or proprietary data. It also validates your JSON and highlights the exact error line when a syntax mistake is detected.
How to Format JSON Online
- 1Paste your JSON — Copy your JSON text and paste it into the input box on the left.
- 2Click Beautify or Minify — Beautify adds indentation for readability; Minify removes whitespace to reduce size.
- 3Review errors — If the JSON is invalid, the error line is highlighted in red and the error message appears below the editor.
- 4Copy the output — Click Copy to copy the formatted JSON to your clipboard.
AI-Powered JSON Conversion Tools
Go beyond formatting — convert your JSON into other schemas and code formats using GPT-4o mini.