DevFormatsFast Developer Tools
for Structured Data
Format, validate, convert and generate JSON, YAML, XML, JWT, CSV and more — all processed locally in your browser.
Turn off your wifi — the tools still work. Nothing is ever uploaded.
Popular Tools
Beautify and pretty-print JSON with configurable indentation.
Check JSON syntax against RFC 8259 with exact line/column error reporting.
Parse JSON and get clear, actionable syntax error explanations.
Browse JSON as a collapsible tree with search and path copy.
Format and validate YAML with 2-space or 4-space indentation.
Pretty-print XML with namespace, CDATA, and comment support.
Decode JWT header, payload, and signature with expiry and algorithm warnings.
Encode or decode Base64 for text and files, Unicode-safe.
Convert CSV to JSON with delimiter detection and header toggle.
Convert JSON to YAML while preserving key order.
Browse by Category
Format, validate, minify, view, query, and diff JSON documents.
Format, validate, and parse YAML configuration files.
Format, validate, and parse XML documents with namespace support.
Convert between JSON, YAML, XML, CSV, and TypeScript.
Generate typed models — TypeScript, Zod, Go, Python, Java, Rust, Kotlin, and C# — from a JSON sample.
Base64, URL, and HTML encode/decode utilities.
Decode and inspect JSON Web Tokens.
Convert cURL commands into request code, and convert between Postman collections and OpenAPI specs.
Convert .env files into docker-compose, Kubernetes, and GitHub Actions secrets.
Generate ORM models — Prisma, Drizzle, TypeORM, SQLAlchemy — from a SQL CREATE TABLE statement.
Why DevFormats
Runs instantly, no upload, no queue.
Everything stays in your browser. Nothing is uploaded, ever.
Unlimited usage. No signup, no limits, no watermarks.
Keyboard shortcuts, dark mode, responsive on any device.