Free developer tools
Small, single-purpose tools for Angular, Node.js and MongoDB work. Every tool runs in your browser, so nothing you paste is uploaded.
ObjectId to Date
Decode a MongoDB ObjectId to its creation date, or turn a date into an ObjectId for _id range queries. Free and runs in your browser.
JWT Decoder
Decode a JSON Web Token in your browser: see the header, payload and exp/iat as readable dates. Decoding only, nothing is uploaded.
JSON to TypeScript
Paste JSON and get TypeScript interfaces or types with nested objects, arrays and optional fields. Free, fast and runs in your browser.
JSON to Mongoose Schema
Paste a JSON document and get a Mongoose schema and model: types, nested sub-schemas, arrays, dates and ObjectId refs. Runs in your browser.
Cron Expression Explainer
Paste a cron expression to see what it means in plain English and the next 5 times it runs in your time zone. Free and runs in your browser.
HTTP Status Codes
Every common HTTP status code explained: what 200, 301, 404, 429, 500 and 503 mean, why they happen, Express fixes and the SEO impact.
Video to Audio Converter
Extract the audio track from an MP4, WebM or MOV file and save it as WAV, right in your browser. No upload, no sign-up, no watermark.
Regex Tester
Test JavaScript regular expressions live: highlighted matches, numbered and named capture groups, flags and replace preview. Runs in your browser.
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to readable dates in UTC and your time zone, and dates back to epoch time. Free, runs locally.
Base64 Encoder and Decoder
Encode text or files to Base64 and decode Base64 back to text, with UTF-8 and URL-safe Base64url support. Runs entirely in your browser.
UUID Generator
Generate random UUID v4 or time-ordered UUID v7 values, one or up to 1,000 at a time, and inspect any UUID. Uses your browser's secure random generator.
JSON Formatter and Validator
Format, validate and minify JSON in your browser. Errors point to the exact line and column, and keys can be sorted. Nothing is uploaded.