A curated guide to the most useful developer utilities available on ToolBox — from JSON formatting to regex testing and hash generation.
As a developer, your time is best spent writing logic — not wrestling with data formats, encoding issues, or manual conversions. Here are 10 tools available on ToolBox that you should have in your daily workflow.
Working with APIs? Paste any JSON blob into the JSON Formatter and instantly get a pretty-printed, syntax-highlighted result. It also validates your JSON and shows you exactly where syntax errors are.
When to use it: Debugging API responses, cleaning up minified JSON, or validating config files.
Base64 encoding is everywhere — JWT tokens, data URIs, basic auth headers. The Base64 Codec handles both standard and URL-safe encoding, with instant encode/decode switching.
When to use it: Decoding JWT payloads, encoding binary data for APIs, working with email attachments.
Need to quickly verify a file hash or generate an HMAC for an API signature? The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512 and shows all four hashes simultaneously.
When to use it: Verifying file integrity, debugging HMAC signatures, generating checksums.
The Regex Tester gives you a live match highlighter with support for all flags (global, case-insensitive, multiline, dotall). Matched groups are broken out individually so you can see exactly what each capture group returns.
When to use it: Building input validation patterns, parsing log files, writing text transformation scripts.
Converting between binary, octal, decimal, and hex is tedious to do mentally. The Number Base Converter shows all four representations simultaneously and updates in real time as you type.
When to use it: Working with bitfields, understanding memory addresses, debugging low-level protocols.
Front-end developers constantly need to convert between HEX, RGB, and HSL. The Color Converter has a native color picker plus text inputs for all three formats, with instant bidirectional updates.
When to use it: Matching design specs, converting CSS values, building color palettes.
The Unix Timestamp Converter shows the current timestamp live and lets you convert in both directions — timestamp to human-readable date and vice versa.
When to use it: Debugging API date fields, calculating time differences, working with scheduled jobs.
Query parameters with special characters, spaces, or Unicode need proper encoding. The URL Encoder handles encodeURIComponent and decodeURIComponent with a single click, showing character count before and after.
When to use it: Building URLs programmatically, debugging query string issues, working with OAuth redirects.
Strip comments and whitespace from your CSS files to reduce load times. The CSS Minifier shows you exactly how much space you saved as a percentage.
When to use it: Optimizing stylesheets before deployment, reducing bundle size, cleaning up vendor CSS.
Write markdown and see the rendered HTML instantly with the Markdown Preview tool. Supports full GFM syntax including fenced code blocks, tables, links, and images.
When to use it: Previewing README files, drafting documentation, writing blog posts.
All of these tools are completely free with no account required. Bookmark your most-used ones and you'll save hours every week.