JSON → CSV
Flatten nested JSON arrays into clean CSV tables.
~/freejsontoolkit $ tools --list
Developer Tools
Fast, privacy-first utilities for JSON, CSV, XML & YAML. Everything runs in your browser. No uploads, no accounts, no waiting.
- 28live now
- 1in the pipeline
- 0bytes uploaded
AVAILABLE NOW
Pick a tool and start
Every tool shares one engine, one editor, one design language, and runs 100% locally. Star the ones you reach for; they'll remember you.
TOML → JSON
Convert TOML configs into JSON.
CSV → JSON
Convert CSV files into structured JSON.
JSON → XML
Transform JSON into well-formed XML.
XML → JSON
Parse XML documents into JSON objects.
YAML → JSON
Convert YAML configs into JSON.
JSON → YAML
Turn JSON into readable YAML.
CSV → TSV
Convert comma-separated tables into tab-separated values.
TSV → CSV
Turn tab-separated tables into clean, quoted CSV.
JSON → TOML
Turn JSON into readable TOML.
JSON Formatter
Beautify and pretty-print JSON with consistent indentation.
JSON Minifier
Strip whitespace to shrink JSON while preserving correctness.
JSON Validator
Check JSON syntax and pinpoint the exact error line.
JSON Schema Lite
Validate JSON against a schema, fully offline.
JSON Diff
Compare two JSON documents and highlight the differences.
Text Diff
Line-by-line diff for any two text inputs.
Fake JSON Generator
Generate realistic mock JSON from a simple shape.
UUID Generator
Generate v1, v4, v5 and v7 UUIDs in bulk, instantly.
Base64 Encode / Decode
Encode and decode Base64 in the browser.
URL Encode / Decode
Percent-encode and decode URL components.
JWT Decoder
Decode JWT header, payload, and signature — no verification server.
Timestamp Converter
Convert Unix timestamps to human dates and back.
Regex Tester
Test regular expressions with live matches and capture groups.
SHA-256 Hash Generator
Generate secure SHA-256 hashes from text or files.
SHA-512 Hash Generator
Generate SHA-512 hashes for high-security applications.
MD5 Hash Generator
Generate MD5 checksums (legacy use only).
HMAC Generator
Generate Hash-based Message Authentication Codes.
bcrypt Password Hasher
Generate secure bcrypt hashes for passwords.
In the pipeline
Shipped in the open. The roadmap follows demand.
REST Request Builder
Compose and inspect HTTP requests locally.