Generators & Utilities
Mock data, JWT decoding, size analysis, NDJSON, GeoJSON, .env, and other everyday JSON utilities.
Mock JSON Data Generator
Generate realistic mock JSON with names, emails, addresses, UUIDs, dates, and custom templates.
JSON Size Analyzer
Analyze JSON byte size, key count, nesting depth, and estimated gzipped size over the wire.
JSON Stats & Tree Statistics
Get instant statistics on any JSON: total keys, value-type breakdown, array lengths, and max depth.
JSON5 / JSONC Converter
Convert JSON5 or JSONC (JSON with comments) into strict standard JSON and back.
NDJSON / JSON Lines Converter
Convert between JSON arrays and newline-delimited JSON (NDJSON/JSONL) used in logs and streaming.
JWT Decoder
Decode JSON Web Tokens to inspect the header and payload as formatted JSON, entirely in your browser.
JSON Random Generator (UUID & More)
Generate random JSON values, UUIDs, timestamps, and sample objects on demand.
JSON URL Encoder / Decoder
Encode JSON for safe use in URLs or decode URL-encoded JSON back into readable form.
JSON String Converter (Stringify / Parse)
Convert JSON to an escaped string literal for embedding in code, or parse a stringified JSON back to an object.
GeoJSON Viewer & Validator
Validate GeoJSON and preview geometries on an interactive map.
JSON to .env Converter
Convert flat JSON config objects into .env file format and vice versa.
Properties to JSON Converter
Convert Java .properties files into nested JSON and back.
TOML to JSON Converter
Convert TOML configuration (Cargo.toml, pyproject.toml) into JSON and back.