5 Free Developer Tools Every Programmer Needs

Tools That Should Be in Every Developer's Bookmark Bar

Developers constantly reach for small utility tools — formatting a JSON response, decoding a Base64 string, testing a regex pattern. Most of us bounce between a handful of random websites for these tasks, each with its own ads, signups, and privacy concerns.

FreshUtil bundles all of these into one place, running entirely in your browser. Here are five you'll use daily.

1. JSON Formatter & Validator

The problem: You get a minified JSON response from an API and need to read it. Or you've hand-edited a config file and want to check if it's valid.

The tool: JSON Formatter takes raw JSON, validates it, and pretty-prints it with proper indentation and syntax highlighting. It catches common mistakes — trailing commas, unquoted keys, mismatched brackets — and tells you exactly where the error is.

Why it's useful: Unlike browser devtools which show parsed objects, this gives you the formatted text you can copy and paste into a config file or documentation.

2. Base64 Encoder/Decoder

The problem: You need to encode an API token, decode a data URL from a stylesheet, or inspect a Base64-encoded JWT payload.

The tool: Base64 Encoder/Decoder handles both directions. Paste encoded text and get the decoded output, or paste plain text and get the Base64. Handles Unicode correctly — including emoji, which trips up many Base64 tools.

Pro tip: Use it to quickly decode the payload section of a JWT token. Split the JWT at the dots, paste the middle section, and you'll see the claims.

3. Hash Generator

The problem: You need to generate a SHA-256 hash for file verification, create a checksum, or hash a string for comparison.

The tool: Hash Generator computes SHA-1, SHA-256, SHA-384, and SHA-512 hashes using the browser's native Web Crypto API. The results are cryptographically correct — these are the same algorithms used by git, package managers, and security certificates.

Why browser-native matters: Since it uses the Web Crypto API rather than a JavaScript implementation, the hashing is hardware-accelerated on most devices and runs at native speed.

4. Regex Tester

The problem: Writing regex is hard. Debugging regex is harder. You need to test a pattern against sample text, see what it matches, and understand why it doesn't match what you expect.

The tool: Regex Tester gives you a live-updating regex playground. Type your pattern, paste your test string, and see matches highlighted in real time. Supports flags (global, case-insensitive, multiline) and shows capture groups.

When to use it: Before committing any regex to production code. Always.

5. Password Generator

The problem: You need a strong random password for a new service, API key, or database credential. You don't want to use the same password you use everywhere else, and you don't want to think of one.

The tool: Password Generator creates cryptographically random passwords using crypto.getRandomValues() — the same entropy source browsers use for TLS. Choose length, character types (uppercase, lowercase, numbers, symbols), and get a password with a visual strength meter.

Important: This uses true random numbers, not Math.random(). Every character is drawn from a cryptographically secure random number generator.

Honorable Mentions

• URL Encoder/Decoder — for query strings and path segments
• UUID Generator — v4 UUIDs from crypto.randomUUID()
• Color Converter — HEX, RGB, HSL conversions
• CSS Minifier — shrink stylesheets before deployment
• Markdown Editor — live preview with syntax highlighting

All of these run in your browser. No server calls, no tracking, no data collection. Bookmark freshutil.com/tools/developer and stop juggling ten different tool sites.