Free online JSON formatter
JSON Formatter
Format, prettify, and minify JSON in the browser with instant syntax feedback.
Developer utility
Browser based
Runs on the current page
Copy-ready
Use the output where you work
No sign-in
Open the tool and get moving
Developer tool
Format JSON
Paste JSON, choose spacing, and create a clean formatted or compact output.
Built for developers
Small utilities for fast technical checks.
Entwicklera developer tools are made for everyday formatting, encoding, decoding, generation, and inspection tasks during implementation and debugging.
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JWT Generator
Generate unsigned or HS256-signed JWT tokens from editable header and payload JSON.
Regex Tester
Test JavaScript regular expressions against sample text with match highlighting and capture groups.
Base64 Encode/Decode
Encode text to Base64 or decode Base64 back to UTF-8 text with optional URL-safe mode.
FAQ
JSON Formatter questions.
Does this JSON formatter upload my data?
No. The formatter runs in your browser and does not send the JSON text to a server.
Can I minify JSON with this tool?
Yes. Paste valid JSON and use the minify action to generate a compact one-line version.
Custom software