Local Processing
Every transformation runs in your browser using JavaScript. No server round-trips, no latency. Input and output never leave your device — ideal for working with JSON data or encoded payloads.
27 browser-based developer utilities for JSON, encoding, text processing, and date conversion. Every tool runs client-side — no data upload, no signup, instant results.
27 free dev tools organized into 4 categories. Each category page lists every tool with descriptions and direct links.
Convert between Unix timestamps and human-readable dates, parse ISO date strings, and explain cron schedule expressions in plain English.
Encode and decode Base64 and URLs, generate SHA-256 and MD5 hashes, create UUIDs, and inspect JWT tokens.
Parse, validate, prettify, and transform JSON data into TypeScript interfaces, Go structs, Python dataclasses, and CSV exports.
Clean, sort, deduplicate, and transform text. Count lines and words, convert text cases, test regex patterns, and generate URL slugs.
The most-used online utilities across all categories.
Free online JSON to TypeScript converter to generate TypeScript interfaces instantly in your browser.
JSON ToolsFree online JSON prettify tool to format and beautify JSON for better readability.
JSON ToolsFree online Base64 decoder to decode Base64 and Base64URL strings to readable text.
Encoding & HashingFree online JWT decoder to decode JWT header and payload locally in your browser.
Encoding & HashingFree online Unix timestamp converter to convert epoch time to ISO, UTC, and local date.
Date & Time ToolsFree online regex tester to test regular expressions and inspect matches quickly.
Text UtilitiesFree online URL encoder to encode text safely for URL query strings and paths.
Encoding & HashingFree online slug generator to create SEO-friendly URL slugs from titles and text.
Text UtilitiesThese free dev tools are designed for speed, privacy, and reliability in daily developer workflows.
Every transformation runs in your browser using JavaScript. No server round-trips, no latency. Input and output never leave your device — ideal for working with JSON data or encoded payloads.
No data is sent to any backend. No cookies track your usage. No account is needed. Safely paste API keys, tokens, or production data into tools like the JWT Decoder or Base64 Decoder.
Static pages load in milliseconds. Tools produce output as you type with zero delay. Once cached, utilities like the JSON Prettifier and Regex Tester work without an internet connection.
Combine multiple free dev tools to handle common development tasks end-to-end.
Paste a minified JSON payload, prettify it with the JSON formatter, validate the structure, then convert it to TypeScript interfaces for type-safe API handling in your codebase.
Decode a JWT to inspect header and payload claims, Base64-decode individual token segments, and verify SHA-256 hash checksums against expected values.
Remove empty and duplicate lines from log output, sort the remaining entries alphabetically, then count lines and characters for compliance reporting.
Complete directory of 27 online utilities across 4 categories. Every tool is free, runs in your browser, and requires no signup.