Développeur
JSON, Base64, hachage et utilitaires développeur
Free developer utilities for JSON, encoding, hashing, JWT, SQL, CSS, and HTTP debugging. Most tools run locally in your browser so secrets and sample payloads stay on your device.
JSON & data formats
Format, compare, validate, and convert structured data.
Formateur JSON
Format and validate JSON data
Comparateur JSON
Compare two JSON documents by structure, ignoring key order and formatting
Validateur de Schéma JSON
Validate JSON data against a JSON Schema
Générateur de Schéma JSON
Generate a JSON Schema from sample JSON data
Formateur YAML
Format and validate YAML documents
YAML ⇄ JSON
Convert between YAML and JSON formats
TOML ⇄ JSON
Convert between TOML and JSON formats
JSON ⇄ XML
Convert between JSON and XML formats
Formateur XML
Format, validate and minify XML documents
JSON en Code
Generate TypeScript, C# or Java classes from sample JSON
Générateur de Données Fictives
Generate realistic fake names, emails and addresses as CSV or JSON
Encode, hash & tokens
Base64, HTML entities, hashes, JWT, and UUID helpers.
Encodeur Base64
Encode and decode Base64 strings
Encodeur HTML
Encode and decode HTML entities
Hachage MD5
Generate MD5 hash from text or files
Hachage SHA-256
Generate SHA-256 hash from text or files
Hachage BCrypt
Generate and verify BCrypt hashes
Hachage Argon2
Generate and verify Argon2 hashes
Décodeur JWT
Decode and inspect JWT tokens
Encodeur JWT
Encode and sign JWTs with HS/RS/ES/PS algorithms in the browser
Générateur UUID
Generate unique UUIDs/GUIDs
Convertisseur Hexadécimal
Convert between hex, decimal and binary
Générateur de Clés Secrètes et Mots de Passe
Generate cryptographically random API keys, UUIDs, hex and base64 secrets
Code format & minify
Beautify or minify JS, HTML, CSS, SQL, and TypeScript.
Formateur JavaScript
Format messy or minified JavaScript into clean readable code
Minificateur / Formateur JavaScript
Minify or beautify JavaScript code
Minificateur HTML
Minify or beautify HTML including inline CSS and JavaScript
Minificateur / Formateur CSS
Minify or beautify CSS code
Formateur TypeScript
Format and beautify TypeScript code
Formateur SQL
Format and beautify SQL queries
Générateur de Requêtes SQL
Visually build SELECT, INSERT, UPDATE and DELETE queries
Testeur Regex
Test regular expressions with highlighting
Comparateur de Différences
Compare two texts and find differences
CSS & color tools
Gradients, shadows, radius, contrast, and color conversion.
Générateur de Dégradés CSS
Visually build CSS gradients
Générateur d'Ombres CSS
Visually build CSS box-shadows
Générateur de Bordures Arrondies CSS
Visually build CSS border-radius
Vérificateur de Contraste des Couleurs
Check WCAG accessibility compliance
Convertisseur RVB vers HEX
Drag RGB sliders and get HEX, HSL, HSV and CMYK live
Convertisseur HEX vers RVB
Convert HEX to RGB, RGBA, HSL, HSV, CMYK and decimal with live preview
HTTP & APIs
Inspect URLs, headers, and craft API requests.
Testeur d'API
Send HTTP requests to any REST API and inspect the response - works with public endpoints and your localhost dev server
Générateur Curl
Build a correctly quoted curl command from a form, updating as you type
Visualiseur d'En-têtes HTTP
Fetch a URL and inspect its response headers
Analyseur d'URL
Parse and analyze URL components
Générateur Cron
Generate cron expressions visually
Éditeur avec Aperçu HTML
Live HTML/CSS/JS playground
Capture d'Extrait de Code
Turn code or a quote into a windowed image you can post
Frequently asked questions
Most formatter, encoder, JWT, and hash tools run entirely in your browser. A few network tools (API request builder, header viewer) must contact the URL you ask them to, by design.
Yes. Format, validate, and beautify JSON online with no signup required.
The JWT Decoder inspects header and payload in your browser. Never paste production secrets into any online tool you do not trust; prefer local decoding for highly sensitive tokens.
Use JSON Compare for structure-aware diffs, or Diff Checker for raw text comparison.