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JSON Prism is a fast, privacy-first JSON tool that runs entirely in your browser. Paste or type JSON above to format, validate, diff, convert, and explore your data — no sign-up required, no data sent to any server.
Instantly format messy, minified, or hand-written JSON into clean, indented output with configurable indent levels.
Validate JSON syntax in real time. Errors are highlighted inline with line numbers so you can fix issues immediately.
Compare two JSON documents side-by-side. Added, removed, and changed keys are color-coded for fast review.
Convert JSON to YAML, XML, or CSV with a single click. Copy the output or download it as a file.
Explore deeply nested JSON structures with an interactive, collapsible tree. Click any node to expand or collapse it.
Search across keys and values in large JSON documents. Results are highlighted and navigable with keyboard shortcuts.
Strip all whitespace from JSON to produce the smallest possible output for network transmission or storage.
Generate realistic mock JSON data from a schema. Useful for prototyping APIs or populating UI components.
Analyze JSON structure at a glance: key counts, nesting depth, data types, and potential schema inference.
New to JSON or want to deepen your knowledge? Our free tutorial covers everything from basic syntax to JSON Schema, JSONPath, REST APIs, and security.
JSON (JavaScript Object Notation) is a lightweight data format used by 70%+ of APIs. Learn what JSON is, why it exists, and when to use it.
JSON supports exactly six data types. Learn strings, numbers, booleans, null, objects, and arrays with examples.
Master JSON syntax: double quotes for keys and strings, no trailing commas, no comments. Avoid common JSON mistakes.
Learn the most common JSON patterns: list of objects, nested config, key-value lookup. Copy-paste ready examples.
Every operation in JSON Prism runs locally in your browser using JavaScript. No JSON data is ever transmitted to a server, stored in a database, or shared with third parties. You can safely use JSON Prism with confidential API responses, internal configs, and sensitive data.