JSON Formatter CSS

The tool formats and validates JSON payloads for developers and API teams. It accepts JSON strings or files and outputs a clean, well-indented representation along with validation results. Conceptually, it parses the input to a structured tree, then serializes it with deterministic indentation rules, preserving data types and escaping as required by RFC 8259. It can optionally sort keys to ensure stable diffs, which is useful in code reviews and version-controlled pipelines. Beneficiaries include API developers, QA engineers, and data engineers who need reliable, readable payloads for debugging, documentation, and testing. Unique value comes from combining strict syntax validation with configurable formatting that mirrors common coding conventions while maintaining fidelity to the original data. Core features include 2-space and 4-space indentation, compact mode, optional key sorting, error reporting with position, and support for large payloads through streaming. Use cases span API contract testing, log analysis, and data pipeline debugging; the tool helps speed up discovery of structural issues and improves diffs in code reviews. Example: input {"a":1} with 2-space indent yields a readable block; invalid input returns an error with location.