A JSON formatter is a free developer tool that beautifies, validates and minifies JSON data. Paste raw JSON and it instantly formats it with proper indentation and syntax highlighting — making nested structures easy to read and debug. It also validates JSON and highlights any syntax errors.
Format and validate API responses while developing or debugging REST and GraphQL APIs.
Readable JSON makes it much easier to spot missing commas, unclosed brackets and incorrect data types.
Validate JSON config files for Node.js, package.json, tsconfig and similar before deployment.
Inspect and verify JSON data during ETL pipelines and data transformation workflows.
JSON (JavaScript Object Notation) is a lightweight data format for storing and transmitting structured data. It uses key-value pairs, arrays and nested objects, and is the most common format for web APIs.
JSON is more compact, easier to read and faster to parse than XML. Most modern APIs use JSON. XML is still used in SOAP APIs, RSS feeds and configuration files in older systems.
Common errors: missing closing brackets } or ], missing quotes around keys, trailing commas after the last item, and using single quotes instead of double quotes.
Minification removes all whitespace, line breaks and indentation to produce the most compact JSON. This reduces file size for production but makes it unreadable — always keep a formatted version for development.