JSON String Formatter

This tool accepts a raw JSON string and outputs a normalized representation. It handles objects, arrays, numbers, strings, booleans, and nulls according to the ECMA 404/RFC 8259 standard. The core objective is to produce consistent, deterministic text for comparison, diffs, and automated processing. It benefits developers, QA engineers, data scientists, and integration specialists who ingest or emit JSON data daily.
Conceptually, input is parsed into an abstract syntax tree and then serialized back with user selected formatting. The default mode pretty prints with a standard indent, while a minify mode collapses whitespace without changing values. Advanced normalization can reorder keys in a stable way only when the input implicitly requires it for comparison. The tool reports syntax errors with precise positions to speed fixes.
Core value includes reducing time spent on formatting diffs, preventing subtle whitespace issues, and ensuring code reviews are easier. Use cases include preparing API payloads, cleaning data exports, validating logs, and standardizing configuration files across teams. It is designed for automated pipelines as well as ad hoc exploration of JSON data.
Key features include strict syntax validation, configurable indentation, deterministic minification, and a clear error model. The tool operates entirely on textual representations of JSON and does not evaluate the payload semantics or execute code. It supports large inputs via streaming style processing and returns a single well formed string along with an optional diagnostic report.