Directory

Free online developer tools

33 browser-based utilities — JSON formatter, JWT decoder, Base64 encoder, regex tester, and more. Pick one and start building. Everything runs on your machine.

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33 results

Data & JSON

JSON Formatter

Beautify JSON with instant validation.

JSON Validator

Check JSON syntax instantly.

JSON Minifier

Compact JSON for production payloads.

JSON to TypeScript

Generate TypeScript types from JSON.

YAML Validator

Validate and format YAML.

Encoding & URL

Encoding & URL→

Base64 Encoder / Decoder

Encode or decode Base64 text.

Encoding & URL→

URL Encoder / Decoder

Encode and decode URL strings.

Encoding & URL→

HTML Entity Encoder / Decoder

Escape and unescape HTML entities.

Security & Tokens

Security & Tokens→

JWT Decoder

Inspect JWT tokens without verification.

Regex & Text

Regex & Text→

Regex Tester

Test regex patterns with live matches.

Regex & Text→

Regex Escape / Unescape

Make text safe for regex patterns.

Date & Time

Timestamp Converter

Convert Unix timestamps to dates.

Date & Time Converter

Convert dates across common formats.

Web & HTTP

URL Parser

Break down any URL into its parts.

HTTP Status Code Reference

Quick reference for HTTP status codes.

Code Formatting

Code Formatting→

CSS Formatter / Minifier

Format or minify CSS.

Code Formatting→

HTML Formatter / Minifier

Format or minify HTML markup.

Code Formatting→

JavaScript Formatter / Minifier

Format or minify JavaScript (lightweight).

Code Formatting→

SQL Formatter

Make SQL readable.

Data Conversion

Data Conversion→

JSON to CSV

Turn JSON arrays into spreadsheet-ready CSV.

Data Conversion→

JSON ↔ YAML

Switch between JSON and YAML formats.

Data Conversion→

CSV ↔ JSON

Convert between CSV and JSON.

Data Conversion→

XML Formatter / Validator

Format and validate XML.

Cryptography

Cryptography→

Hash Generator

One-way cryptographic hashes in the browser.

Cryptography→

HMAC Generator

Generate HMAC signatures locally.

Developer Productivity

Developer Productivity→

UUID Generator

Generate random UUID v4 identifiers.

Developer Productivity→

Color Converter

Convert colors across formats.

Developer Productivity→

Markdown Previewer

Write Markdown and preview rendered HTML.

Developer Productivity→

Markdown File Reader

Read and preview Markdown files in your browser.

Developer Productivity→

Code Compare

Diff two code blocks instantly.

Developer Productivity→

cURL to Fetch

Turn cURL into fetch() code.

Developer Productivity→

cURL to Axios

Turn cURL into Axios code.

Developer Productivity→

QR Code Generator

Create QR codes locally.