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Developer Tools

An online toolbox for developers worldwide, bringing together code formatting, encoding and decoding, data conversion, text processing, content generation and network debugging. From JSON and SQL formatting to Base64, timestamp conversion, regular expression testing and token counting, find practical tools for everyday development tasks.

Organize API data, compare text, generate test data or estimate the tokens in an AI prompt. Search by name or browse categories to find the tool you need. All tools are free, require no account and perform calculations locally in your browser. The token counter explains the counting method and estimation limits for each model option.

41 tools found

Text & comparison

Token Counter

Formatting & validation

JSON Formatter

Format & validate JSON

Formatting & validation

SQL Formatter

Beautify SQL queries

Formatting & validation

YAML Formatter

Format & validate YAML

Formatting & validation

XML Formatter

Format & validate XML

Formatting & validation

CSS Formatter

Format & minify CSS

Formatting & validation

HTML Formatter

Format & beautify HTML

Text & comparison

JSON Diff

Compare two JSON objects

Text & comparison

Markdown Preview

Real-time Markdown rendering

Security & signatures

JWT Decoder / Encoder

Decode & encode JWT tokens

Time & scheduling

Timestamp Converter

Unix ↔ date/time converter

Units & conversion

CSS Unit Converter

px, rem, em, vw, vh converter

Encoding & decoding

Base64 Encoder / Decoder

Encode and decode Base64

Encoding & decoding

URL Encoder / Decoder

Encode and decode URLs

Security & signatures

Hash Generator

Generate SHA hash values

Security & signatures

HMAC Generator

Compute HMAC signatures with a secret key

Encoding & decoding

Image Base64 Encoder / Decoder

Convert images to/from Base64

Generators

UUID Generator

Generate v4 UUIDs

Generators

Password Generator

Generate secure passwords

Units & conversion

Color Converter

Convert HEX, RGB, HSL colors

Time & scheduling

Cron Parser

Parse cron expressions & preview next runs

Generators

QR Code Generator

Generate QR codes from text or URLs

Generators

Lorem Ipsum Generator

Generate placeholder text

Generators

Mock Data Generator

Generate realistic fake JSON test data

Text & comparison

Text Diff

Compare two text blocks

Text & comparison

Regex Tester

Test and debug regular expressions

Text & comparison

Case Converter

Convert text between cases

Text & comparison

Text Stats

Analyze text statistics

Units & conversion

Number Base Converter

Convert between binary, octal, decimal, hex

Units & conversion

JSON ↔ CSV Converter

Convert JSON arrays to/from CSV

Encoding & decoding

HTML Entity Encoder / Decoder

Encode and decode HTML entities

Security & signatures

Unix Chmod Calculator

Calculate file permissions rwx ↔ numeric

Network & reference

HTTP Status Codes

Quick reference for HTTP status codes

Network & reference

MIME Types

File extension ↔ MIME type lookup

Units & conversion

ASCII Table

ASCII codes — decimal, hex, octal, binary

Network & reference

URL Parser

Inspect URL components

Network & reference

CIDR Calculator

IPv4 subnet calculator

Network & reference

cURL to Fetch / Axios

Convert cURL commands to fetch or axios

Time & scheduling

Timezone Converter

World clock & timezone converter

Units & conversion

Byte Size Calculator

Convert KB, MB, GB, TB — SI & binary

Formatting & validation

JSON Schema Validator

Validate JSON against a JSON Schema