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40 tools in this collection

Developer Tools

Daily JSON, code, conversion, and debugging utilities.

No required signupLocal-first saved work
CSV Duplicate Remover
Deduplicate CSV rows by all fields or selected columns.
Runs locally
Chmod Permission Calculator
Convert Unix permission bits between octal and symbolic notation.
Runs locally
.env Example Generator
Create a values-free .env.example and check assignment syntax.
Runs locally
JSON Formatter
Format, beautify, minify, validate JSON.
Popular
Runs locally
SQL Formatter
Prettify complex SQL queries.
Runs locally
Regex Tester
Test regex patterns in real-time.
Runs locally
Cron Parser
Parse cron expressions to human text.
Runs locally
JWT Decoder
Decode and inspect JWT tokens.
Runs locally
Markdown Preview
Live markdown editor & preview.
Runs locally
Hash Generator
Binary-safe MD5 and SHA file or text checksums.
Popular
Runs locally
HMAC Generator & Verifier
Generate and verify HMAC signatures locally.
Popular
Runs locally
UUID Generator
Generate and validate UUID v4 and time-ordered v7.
Popular
Runs locally
Base64 Encoder
Encode and decode Base64.
Runs locally
URL Encoder
Encode/decode URLs and query strings.
Runs locally
HTML Encoder
Encode/decode HTML entities.
Runs locally
Hex Converter
Text to hex, hex to text.
Runs locally
Binary Converter
Text to binary and back.
Runs locally
ROT13 Cipher
ROT13, ROT47, Caesar cipher.
Runs locally
JSON to TypeScript
Generate TS interfaces from JSON.
Runs locally
JSON to C#
Generate C# classes from JSON.
Popular
Runs locally
JSON to CSV
Convert JSON arrays to CSV files.
Runs locally
CSV to JSON
Convert CSV/Excel data to JSON.
Runs locally
JSON to SQL
Generate INSERT statements.
Runs locally
JSON to YAML
Convert JSON to YAML format.
Runs locally
Webhook Tester
Generate URLs & inspect requests.
Network required
Text Diff
Compare text side by side.
Runs locally
SVG Optimizer
Minify and clean SVG code.
Runs locally
Unit Converter
PX to REM, Hex to RGB, Unix to Date.
Runs locally
JSON Schema Generator
Infer JSON Schema from sample JSON.
Popular
Runs locally
JSON Schema Validator
Validate JSON against Draft 2020-12 schemas.
Popular
Runs locally
YAML to JSON
Convert YAML documents to JSON locally.
Runs locally
Cron Expression Builder
Build schedules with visual cron controls.
Popular
Runs locally
URL Parser
Inspect URL parts and query parameters.
Runs locally
JSONPath Tester
Query JSON with supported path selectors.
Popular
Runs locally
Query String Converter
Convert URL query parameters to and from JSON.
Runs locally
HTTP Status Reference
Search HTTP response codes and meanings.
Runs locally
MIME Type Lookup
Find Content-Type values by file extension.
Runs locally
Secure Key Generator
API keys, JWT secrets, UUIDs, AES, Django keys.
Popular
Runs locally
Password Generator
Generate secure passwords.
Runs locally
Password Strength
Analyze password entropy.
Runs locally

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