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Developer

Developer tools are useful for formatting, encoding, validation and common browser-side utility work.

32 tools Format and inspect Category overview
Common use

Format copied data

How to choose

Read the summaries first, then open the tool closest to your task.

Keep going

If this category is close but not exact, continue into related tool collections or how-to guides.

Best for

Common tasks

  • Format copied data
  • Encode and decode values
  • Inspect protocol and binary payloads
Browse tips

How to choose the right tool

  1. Read each summary first to match the tool to your task.
  2. Open the dedicated tool page next for detailed guidance, related tools, and full features.
  3. If your use case is close, follow related tools for side-by-side comparison.
Category tools

Open the dedicated tools next

JSON Formatter

Format, validate, minify, sort keys and inspect JSON outline locally.

JSONDeveloperValidator

Base64 Encoder / Decoder

Encode/decode Unicode text, URL-safe Base64, and small files in the browser.

Base64FileDeveloper

URL Encoder / Decoder

Encode/decode URL components or full URLs and inspect query parameters.

URLQueryDeveloper

UUID Generator

Generate UUID v1, v3, v4, v5, v6 and v7 with namespace, batch output, uppercase and hyphen options.

UUIDGUIDDeveloper

SHA Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or small files.

SHAHashWeb Crypto

Base Converter

Convert numbers across bases and transform text into hex, binary, Base64 and Unicode bytes.

BaseBinaryHex

IP / CIDR Calculator

Calculate network address, subnet mask, host range and wildcard mask for IPv4 CIDR blocks.

IPCIDRSubnet

HTTP Status Code Lookup

Search and filter common HTTP status codes with bilingual explanations, categories and troubleshooting hints.

HTTPStatus CodeAPI

Protobuf Encoder / Decoder

Encode JSON into Protobuf bytes or decode hex / Base64 Protobuf payloads with a .proto schema in the browser.

ProtobufSchemaBinary

JWT Decoder

Decode JWT header and payload locally, inspect claims, expiry times and raw Base64URL segments.

JWTTokenJSON

Color Converter

Convert HEX, RGB, HSL and HSV colors, inspect alpha values, pick colors visually and preview palettes instantly.

ColorHEXRGB

ASCII Table

Look up printable ASCII codes, control names and character conversions between decimal, hex and binary.

ASCIIChar CodeBinary

XML Formatter

Format and validate XML locally with a clean pretty-printed output.

XMLFormatterValidator

YAML Formatter

Format and validate YAML locally with stable indentation and clean output.

YAMLFormatterValidator

TOML Formatter

Format and validate TOML locally for config files and structured settings.

TOMLFormatterConfig

Docker Run to Compose

Convert common docker run commands into a starter docker-compose service block.

DockerComposeDevOps

Random User-Agent Generator

Generate common desktop and mobile User-Agent strings for testing requests and client detection logic.

User-AgentBrowserTesting

JSON ⇄ CSV Converter

Convert JSON arrays and CSV tables both ways in the browser, with headers, delimiter choice and quick validation.

JSONCSVConverter

AES / DES Encryption Tool

Encrypt or decrypt short text with AES, DES or 3DES in the browser, with selectable block mode, padding, IV and output format.

AESDES3DES

Hex Editor

Inspect text or files as hex bytes, edit hexadecimal content, and decode it back to text locally in the browser.

HexBytesBinary

RSA Key Tool

Generate browser-side RSA key pairs and use them for short text encryption, decryption, signing and verification.

RSAPublic KeyCrypto

Regex Tester

Test JavaScript regular expressions, inspect matches, groups and replacements, and iterate with live sample text in the browser.

RegexPatternReplace

JSONPath Evaluator

Evaluate JSONPath expressions against JSON data, inspect matched paths and preview results with GitHub-style highlighted JSON output.

JSONPathJSONQuery

Crontab Expression Tool

Explain cron expressions, generate friendly schedules, and preview upcoming run times directly in the browser.

CronScheduleCrontab

JSON / YAML / TOML / XML Converter

Convert structured data between JSON, YAML, TOML and XML, validate input, and preview the output with GitHub-style code highlighting.

JSONYAMLTOML

Text Encoding Converter

Convert text bytes between UTF-8, UTF-16, Shift-JIS, EUC-JP and other browser-safe encodings, then inspect normalized text and hex bytes.

UTF-8GBKEncoding

HTTP Response Header Reference

Browse common HTTP response headers, understand caching, security and delivery-related fields.

HTTPResponse HeadersReference

HTTP Request Header Reference

Look up common HTTP request headers and quickly review client, auth and caching related fields.

HTTPRequest HeadersReference

JWT Encoder

Generate HS256, HS384 or HS512 JSON Web Tokens directly in the browser for testing and local workflows.

JWTTokenHMAC

JSON Minify

Minify JSON instantly in the browser and remove unnecessary whitespace before shipping data elsewhere.

JSONMinifyDeveloper

URL Parser

Break a URL into protocol, host, path, query and hash fields, then inspect every parameter clearly.

URLParserQuery

Query String Builder

Build clean query strings from key-value pairs and preview the final URL segment instantly.

URLQueryBuilder
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Related categories and more tool paths

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