Developer Tools

Formatters, converters, generators and validators for developers. All tools run locally in your browser.

• JSON Formatter & ValidatorBeautify, minify and validate JSON with precise error positions.
• Base64 Encoder & DecoderEncode or decode Base64 text, files and data URLs, with UTF-8 support.
• Cron Expression GeneratorBuild, explain and preview cron schedules in plain English.
• Password GeneratorGenerate strong random passwords and passphrases with an entropy readout.
• Regex TesterTest regular expressions live with match highlighting and capture groups.
• Unix Timestamp ConverterConvert Unix epoch seconds or milliseconds to a human date, and back.
• JSON to CSV ConverterConvert JSON arrays to CSV and CSV back to JSON, with nested key flattening.
• JWT DecoderDecode a JWT header and payload, and check its expiry — offline.
• UUID GeneratorGenerate cryptographically random UUID v4, time-ordered v7 and Nano IDs.
• Hash GeneratorGenerate SHA-256, SHA-384, SHA-512, SHA-1 and MD5 hashes of text or files.
• URL Encoder & DecoderPercent-encode or decode URLs and query strings, with a parameter breakdown.

Developer reference

• HTTP status codesEvery status code, what triggers it and how to fix it.
• Cron schedule examplesReady-made cron expressions for every common schedule.
• Port number referenceWhat runs on each port and how to check what is listening.
• CSS unit converterspx, rem, em, pt and more, with an adjustable root font size.
• Data size convertersBytes, KB, MB, GB, TB and their binary counterparts.