Free · Private · No Signup

3 Essential
Developer Tools

The tools you reach for daily — JSON formatting, UUID generation, cryptographic hashing. Everything runs in your browser. Your data never leaves your machine.

100% client-side Instant results Zero tracking
165K+ monthly searches
JSON Formatter
Beautify, validate, and explore JSON instantly as you type. Syntax highlighting, collapsible tree view, plain-English error messages.
Beautify Validate Tree View
Try JSON Formatter
300K+ monthly searches
UUID / GUID Generator
Generate UUID v4 (random) or v1 (timestamp). Bulk generate up to 100 at once. Validate any UUID string against RFC 4122.
v4 Random v1 Timestamp Bulk + Validate
Try UUID Generator
110K+ monthly searches
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 simultaneously from text or files. Drag & drop file hashing, copy per-algorithm or all at once.
SHA-256 MD5 File Hash
Try Hash Generator
More Tools
JSON Validator
Real-time validity check, exact error lines
JSON Minifier
Strip whitespace, see exact size reduction
JSON to CSV
Auto column detection, nested flattening
JSON to YAML
Kubernetes, Docker Compose, CI/CD configs
JSON Diff
Semantic comparison, LCS array diffing
Base64 Encoder / Decoder
UTF-8 safe encode/decode, one-click swap
URL Encoder / Decoder
Full URLs and individual query params
HEX to RGB Converter
Live color preview, HSL output included
Regex Tester
Real-time highlighting, capture groups

Free Developer Tools — No Signup Required

json-format.dev provides essential developer tools that run entirely in your browser. Your data never leaves your machine — no server requests, no logging, no storage.

JSON Formatter & Beautifier

The JSON Formatter instantly beautifies raw JSON with syntax highlighting and a collapsible tree view. Validates in real-time with plain-English error messages showing exact line and column numbers.

UUID Generator (v4 and v1)

Generate cryptographically secure UUID v4 (random) or timestamp-based UUID v1 in your browser using crypto.randomUUID(). Bulk generate up to 100 UUIDs, validate any UUID string for RFC 4122 compliance.

Hash Generator (MD5, SHA-256, SHA-512)

Compute MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously — from text input or by dragging a file. Uses SubtleCrypto for native SHA hashing and SparkMD5 for MD5. No files are uploaded.

Why Client-Side Processing Matters

Many online tools send your data to a server. That means sensitive API responses, internal JSON payloads, and private config files pass through third-party infrastructure. Every tool on this site processes your data in JavaScript running directly in your browser — zero network requests.

All Available Tools