Free browser-based JSON tools from Dynamic Foundries
JSONyfier is a free suite of browser-based tools for formatting, minifying, and validating JSON. It is operated by Dynamic Foundries, a French software company registered in Paris.
The tools are static JavaScript applications. JSON pasted into a tool or opened from a local file is processed on your device and is not uploaded to JSONyfier. No account is required.
Transform messy, minified JSON into clean, readable format with syntax highlighting. Indents with 2 spaces and color-codes keys, strings, numbers, and booleans.
Open JSON FormatterRemove insignificant whitespace outside string values. Measure UTF-8 byte savings, then copy or download the compact result.
Open JSON MinifierCheck whether your JSON is syntactically valid. Get detailed error messages with line numbers and color-coded feedback to quickly locate and fix problems.
Open JSON ValidatorNew to JSON or want to deepen your understanding? Our guides cover the fundamentals and help you choose the right data format for your project:
Tool input is processed in your browser and is not sent to JSONyfier. The site can load Google Analytics only after a visitor accepts analytics cookies; analytics never receives the JSON entered in a tool. See the Privacy Policy for the current data-processing details.
There are no JSONyfier accounts, email-gated results, or paid tool tiers. Browser memory and performance determine the practical input size, so large or streaming documents may require a local command-line tool.
Have feedback, feature requests, or found a bug? Reach out at contact@dynamic-foundries.com. We read every message and genuinely appreciate hearing from our users.
For a concise, sourced inventory of features and limits, read the verified JSONyfier facts.