Developer & Data Tools·Zero-Upload Browser Execution
JSON Formatter, Validator & Diff
Prettify or minify JSON with strict syntax diagnostics, key counts, and normalized structural comparison against a second payload.
Ctrl/Cmd + Enter to run
Output
Press Execute (or Ctrl/Cmd + Enter) to view output.
More in Developer & Data Tools
JSON to TypeScript & YAML
Infer strict TypeScript interfaces or clean YAML configuration directly from any JSON object or API payload.
JWT Inspector & Claims Decoder
Decode JWT header and payload JSON locally in browser memory, inspect claims, and verify token expiration timestamps.
Base64 & URL Converter
Unicode-safe UTF-8 Base64 encoding/decoding and RFC-3986 URL percent-encoding/decoding with instant validation.
Regex Playground & Inspector
Test regular expressions with custom flags (g, i, m, s), inspect capture groups, and verify exact match indices.
UUID & CSPRNG Password Generator
Generate cryptographic UUID v4 batches and high-entropy passwords using Web Crypto API `crypto.getRandomValues`.
Cron Expression Visualizer
Parse 5-field cron schedules into human-readable breakdowns and compute the next upcoming UTC trigger timestamps.
SHA-256 / SHA-512 & HMAC Signer
Compute cryptographic SHA-256/SHA-512 digests and HMAC-SHA256 webhook signatures locally via SubtleCrypto.
CSV ↔ JSON & Markdown Table
Parse quoted CSV rows into structured JSON arrays, convert JSON back to CSV, or generate aligned Markdown tables.