What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format defined by ECMA-404 and RFC 8259. It is easy for humans to read and write and easy for machines to parse and generate. JSON has become the de facto standard for data exchange in web APIs, configuration files, and NoSQL databases.
This formatter parses your JSON, validates its structure, and re-serializes it with consistent indentation. It also counts keys, measures nesting depth, and reports byte size — all entirely in your browser with no data sent to any server.
Common JSON Use Cases
- REST API request and response payloads
- Configuration files (package.json, tsconfig.json, .eslintrc)
- NoSQL database documents (MongoDB, CouchDB, Firebase)
- Data serialization between microservices
- Local storage and session storage in web apps
