JSONHack
Validator · Formatter · Base64
Tools
JSON validator, formatter, minifier & Base64 encoder/decoder

Input

Paste JSON or plain text (Base64 → switch tab)

Output

Result appears here — copy or download as needed
About JSONHack
Fast • Private • Browser-based
Share: Copy URL

JSONHack is a free online JSON toolkit for developers, QA engineers, and API testers. Quickly format, validate, beautify, and pretty-print JSON with one click. Convert JSON to string or string to JSON, edit JSON directly using the integrated JSON editor, or use the Base64 encoder/decoder for safe data transformations. All processing happens locally in your browser — no uploads, no servers. Our tools are optimized for speed, privacy, and developer workflows.

Full feature list

  • JSON Formatter — pretty-print JSON and adjust indentation.
  • JSON Validator — detects syntax errors and highlights problems.
  • JSON Minify — compress JSON for production use.
  • Base64 Encode / Decode — convert text and small binary blobs quickly.
  • JSON Editor — edit and update structured JSON with ease.
  • Converters — JSON → String, String → JSON.

SEO keywords included

json formatter, json validator, json beautifier, json pretty print, base64 encode decode, online json tool, json editor, base64 converter, json to string, string to json

What Is a JSON Formatter & Why Developers Need It

JSON (JavaScript Object Notation) is the lingua franca for modern web APIs and configuration files. A JSON formatter converts compact or minified JSON into a human-readable structure with consistent indentation and spacing — making it easier to debug and review JSON payloads.

JSON Formatting vs Validation vs Minification — What's the Difference?

Formatting arranges keys and values for readability. Validation checks syntax. Minification removes whitespace for smaller payloads. JSONHack provides all three functions so you can switch between readable and compact formats instantly.