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JavaScript Object Notation — the most common data interchange format. Used for APIs, configuration, and data storage.
Douglas Crockford popularized JSON (JavaScript Object Notation) in the early 2000s as a lightweight data interchange format, and it was formalized as ECMA-404 in 2013 and RFC 8259 in 2017. Despite its name, JSON is language-independent and has become the dominant format for data exchange across the entire software industry. Every major web API — from REST services to GraphQL responses — uses JSON as its primary serialization format. The structure is built on two universal data constructs: ordered lists (arrays) and key-value maps (objects), with strings, numbers, booleans, and null as primitive values.
This simplicity enables native parsing support in virtually every programming language. JSON's tree structure — with nested objects and arrays forming a hierarchical document — makes it ideal for representing complex data relationships while remaining human-readable. Configuration files across the JavaScript ecosystem use JSON extensively: package.json for Node.js projects, tsconfig.json for TypeScript, and settings files for VS Code, ESLint, and Prettier. JSON Schema provides a vocabulary for annotating and validating JSON documents, enabling automated testing of API contracts.
NoSQL databases like MongoDB, CouchDB, and Firebase store documents in JSON-like formats, and PostgreSQL includes native JSON and JSONB column types. Tools like jq enable command-line JSON processing, while JSON Patch (RFC 6902) and JSON Merge Patch (RFC 7396) define standardized approaches for describing modifications to JSON documents. The format's ubiquity means that JSON comparison is one of the most frequently performed diff operations in software development.
JSON's tree structure means that semantic differences like reordered keys, reformatted whitespace, and nested value changes are poorly represented by line-by-line text diffs. Structural JSON comparison understands the hierarchy, matching objects by key and arrays by position to surface meaningful changes.
Teams compare JSON to review API response contract changes, verify package.json dependency updates, diff configuration modifications, and validate data migration output — all tasks where understanding what changed semantically matters more than which lines moved.
UtraDiff performs a semantic tree diff on JSON files, parsing the full object graph and matching keys at every nesting level. It detects reordered keys as identical, eliminating noise from auto-formatters and prettifiers.
Added, removed, and changed values are highlighted in a structured tree view alongside the text diff with JSON syntax highlighting. Cross-format comparison lets you diff JSON against YAML, TOML, or INI to verify configuration equivalence across environments.
Supported extensions: .json
JSON can be compared with: JSON5, JSONL, YAML, TOML, INI, Environment, Properties