Utility

JSON

JSON formatter, JSONPath playground, JSON ↔ YAML / CSV.

JSON Formatter / Minifier / Validator

Pretty-print, minify, or validate JSON. Strict spec — catches trailing commas, unquoted keys, comments at the source.
JSON ↔ YAML

Convert between JSON and YAML losslessly, preserving scalar types and structure.
JSON ↔ CSV

Convert between flat JSON arrays and CSV / TSV — RFC 4180 quoting via PapaParse.
JSONPath Playground

Test JSONPath queries against a sample document — recursive descent, filters, wildcards.