Developer Tools
Formatters, encoders, hash generators, and utilities for developers.
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Featured developer tools
A curated subset of the strongest pages in this category for faster discovery and clearer internal paths.
JSON Formatter
Beautify, minify, and validate JSON online to make APIs and config files easier to read.
UUID Generator
Generate random UUID/GUID values (v4) for databases, APIs, and unique identifiers.
Base64 Encoder
Encode text or data to Base64 and decode Base64 strings back to readable text in your browser.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and dates back to Unix time.
MD5 Generator
Compute the MD5 hash of any text string for checksums, fingerprints, and legacy integrations.
JSON Validator
Validate JSON syntax and catch structural errors before deploying.
JSON Formatter
Beautify, minify, and validate JSON online to make APIs and config files easier to read.
Base64 Encoder
Encode text or data to Base64 and decode Base64 strings back to readable text in your browser.
UUID Generator
Generate random UUID/GUID values (v4) for databases, APIs, and unique identifiers.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and dates back to Unix time.
MD5 Generator
Compute the MD5 hash of any text string for checksums, fingerprints, and legacy integrations.
JSON Validator
Validate JSON syntax and catch structural errors before deploying.
JSON Viewer
Explore nested JSON trees with a readable hierarchical view.
XML Formatter
Beautify and indent XML documents for easier reading.
XML Validator
Check XML well-formedness and report parsing issues.
YAML Formatter
Format YAML configuration files with consistent indentation.
SQL Formatter
Pretty-print SQL queries for readability and reviews.
HTML Formatter
Beautify HTML markup with clean indentation.
CSS Formatter
Format CSS rulesets for clearer stylesheet editing.
JavaScript Formatter
Beautify JavaScript code for debugging and reviews.
PHP Formatter
Format PHP source code with consistent style.
Markdown Preview
Preview Markdown as rendered HTML in real time.
Markdown to HTML
Convert Markdown documents into HTML markup.
HTML Encoder
Encode special characters into HTML entities safely.
URL Encoder
Percent-encode strings for safe use in URLs and query parameters.
URL Decoder
Decode percent-encoded URL strings back to plain text.
Base64 Decoder
Decode Base64 strings into readable text or data.
JWT Decoder
Decode JSON Web Token headers and payloads for debugging.
JWT Generator
Build and sign simple JWTs for testing authentication flows.
GUID Generator
Generate globally unique identifiers in GUID format.
SHA1 Generator
Compute SHA-1 hashes of text for checksums and fingerprints.
SHA256 Generator
Generate SHA-256 hashes for integrity checks and fingerprints.
SHA512 Generator
Create SHA-512 digests for high-strength content fingerprints.
HMAC Generator
Generate HMAC signatures with common hash algorithms.
Regex Tester
Test regular expressions against sample text with match highlights.
Regex Generator
Build regular expression patterns from examples and options.
Cron Expression Generator
Create and explain cron schedules for jobs and automation.
Color Picker
Pick colors and copy HEX, RGB, or HSL values for design work.
HEX ↔ RGB Converter
Convert colors between HEX and RGB formats instantly.
RGB ↔ HSL Converter
Convert colors between RGB and HSL color spaces.
CSS Gradient Generator
Design CSS linear and radial gradients with ready-to-copy code.
HTML Minifier
Minify HTML by stripping comments and unnecessary whitespace in your browser.
CSS Minifier
Compress CSS by removing comments and extra spaces without uploading files.
JavaScript Minifier
Quickly minify JavaScript by stripping comments and whitespace client-side.
CSV to JSON
Convert CSV rows into a JSON array of objects instantly.
JSON to CSV
Flatten a JSON array into downloadable CSV text.
HTML to Markdown
Convert HTML markup into readable Markdown in your browser.
Binary Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
Cron Expression Parser
Paste a cron schedule and get a human-readable explanation of each field.
About Developer Tools on Toolvark
The developer tools category is where raw payloads get readable again: JSON prettified, SQL indented, JWT claims exposed, hashes generated, regex patterns tested. Everything targets the copy-paste loop between logs, tickets, and your editor—no upload for formatters and encoders when possible.
On-call engineers decode a failing API response before paging the provider. Students diff two config snippets before a lab submission. Security reviewers generate HMAC samples to compare with server logs. Bookmark JSON Formatter for daily work; keep JSON Formatter and Base64 Encoder nearby for the most common handoffs.
With 43 utilities, pick the smallest tool that matches the artifact—formatter versus validator versus generator— so you are not reformatting an entire file when you only needed one field decoded.