Developer Tools
Essential developer utilities for coding, debugging, and data processing. Format and validate JSON, encode/decode Base64 and URLs, generate MD5/SHA hashes, test regular expressions, minify CSS/JavaScript, and convert between data formats. Built for speed — handles large inputs without lag.
22 free tools available — no signup required
All Developer Tools (22 Tools)
JSON Formatter
Format, validate and beautify JSON data with syntax highlighting
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text
URL Encoder/Decoder
Encode or decode URLs and query parameters
HTML Encoder/Decoder
Encode special characters to HTML entities or decode them
Color Picker & Converter
Pick colors and convert between HEX, RGB, HSL formats
Hash Generator
Generate MD5, SHA-1, SHA-256 hash from text
Regex Tester
Test and debug regular expressions with real-time matching
CSS Minifier
Minify CSS code to reduce file size
JavaScript Minifier
Minify JavaScript code to reduce file size
SQL Formatter
Format and beautify SQL queries for better readability
Cron Expression Generator
Build cron expressions visually with presets and next run times
JWT Decoder
Decode JWT tokens and view header, payload, expiry with color-coded sections
JSON Validator
Validate, beautify and analyze JSON with error line numbers and stats
XML to JSON Converter
Convert XML to JSON using DOMParser with attribute support
YAML to JSON Converter
Convert YAML text to JSON format with basic YAML parsing
HTML to Markdown
Convert HTML to Markdown handling headings, lists, tables, links & code
Markdown to HTML
Convert Markdown to HTML with live preview and raw code output
Code Beautifier
Format and beautify HTML, CSS, JavaScript, JSON and SQL code
CSS Grid Generator
Visual CSS Grid builder with column/row sizes, gap, areas and live preview
Flexbox Playground
Visual Flexbox builder with container and item properties, live preview and CSS code
Tailwind CSS Generator
Build UI components visually with Tailwind CSS classes and get HTML code
SVG Editor
Draw shapes, set colors, position elements and export clean SVG code
What are Developer Tools?
Developer tools on SabTools.in handle the small but frequent tasks that fill every working day for software engineers: format a JSON response, decode a Base64 string, test a regular expression, generate an MD5 hash for a file name, or validate that a webhook payload matches a schema. Each tool processes the input entirely on the client — because developer inputs often include API keys, tokens, user PII, or proprietary code, and sending those to a third-party server is exactly the kind of compliance problem that costs careers.
Key Features & Capabilities
Client-side everything
No input ever leaves your browser. JSON you are debugging stays on your device; JWTs you are decoding never touch our infrastructure; Base64 blobs are processed locally. Safe to use with production credentials.
Handles large inputs
JSON formatter processes documents up to 10 MB+ without lag. Hash generators handle multi-megabyte inputs. Regex tester benchmarks pattern performance on inputs up to 1 MB.
Syntax highlighting and error detection
Formatters show exactly where your JSON is malformed, which bracket is unmatched, which quote is unclosed. Error positions map to line and column numbers.
Copy-paste ergonomics
Every output has a one-click copy. Keyboard shortcuts work where expected (Cmd/Ctrl+A to select all, Cmd/Ctrl+Enter to run, Escape to clear).
Common Use Cases
Debugging a malformed JSON API response
Paste the raw response into JSON Formatter. If it is valid, you get a readable pretty-printed output with syntax highlighting. If not, the tool shows you the exact line and column where parsing failed — usually a trailing comma, an unquoted key, or an unescaped quote inside a string.
Decoding a JWT to inspect claims
JWTs are Base64URL-encoded JSON. Paste the full token into the JWT Decoder to see the header, payload claims (user ID, scopes, expiration), and signature. Useful for debugging auth issues without a full OAuth playground.
Generating a stable ID for cache keys
Hash generators (MD5, SHA-1, SHA-256, SHA-512) produce deterministic IDs from arbitrary inputs. Useful for computing a cache key from a URL, generating a stable identifier from a user email, or verifying a file's integrity against a known hash.
Testing a regex before committing to code
The Regex Tester runs your pattern against sample inputs in real time, highlighting matches, capture groups, and showing the total number of matches. Supports all JavaScript regex flags (g, i, m, s, u, y) and reports on catastrophic backtracking risk for pathological patterns.
How to Choose the Right Tool
For data-format problems — JSON, XML, CSV, YAML — pick the formatter/validator for that format. For encoding problems — Base64, URL encoding, HTML entities — pick the specific encoder/decoder. For content hashing — MD5 for non-cryptographic dedup, SHA-256 for anything security-adjacent. For pattern matching — Regex Tester. If you cannot find the specific tool, the closest match is usually linked from a tool you do find; we group related tools in the same category for discovery.
Developer Tools Built for India
Indian software engineers increasingly work on global products but with India-specific edge cases: PAN card number validation (pattern AAAAA9999A), GSTIN validation (15-character state + PAN + entity code + checksum), Aadhaar number format checks (12 digits with Verhoeff checksum), IFSC code validation, UPI ID format, and PIN code lookup. Where standard developer tools ignore these, we ship validators for them specifically so a backend engineer building an Indian FinTech app does not have to write the regex for the fifteenth time.
Who Uses These Developer Tools?
Web developers debugging API responses, backend engineers processing data, DevOps professionals working with configurations, and computer science students learning data formats.
Why Use Developer Tools on SabTools.in?
100% client-side processing means your API keys, tokens, and code never leave your device. Handles inputs up to 10MB+. Syntax highlighting and error detection included.
Popular Tools in This Category
- JSON Formatter — Format, validate and beautify JSON data with syntax highlighting
- Base64 Encoder/Decoder — Encode text to Base64 or decode Base64 to text
- URL Encoder/Decoder — Encode or decode URLs and query parameters
- HTML Encoder/Decoder — Encode special characters to HTML entities or decode them
- Color Picker & Converter — Pick colors and convert between HEX, RGB, HSL formats
- Hash Generator — Generate MD5, SHA-1, SHA-256 hash from text
- Regex Tester — Test and debug regular expressions with real-time matching
- CSS Minifier — Minify CSS code to reduce file size
...and 14 more tools. Explore all 22 developer tools above.
Frequently Asked Questions
Can I trust these tools with production API keys or JWTs?
Why does my 50 MB JSON lag the browser?
Are the hashes suitable for password storage?
Do the regex tests match Python / PCRE or only JavaScript?
Can I save favourite inputs or templates?
Related Topic Pillars
These categories pair naturally with developer tools — readers often move between them.
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