ONTOOLS

Developer Tools

JSON, CSV, timestamps, regex, and code utilities.

JSON Formatter
Format, validate, and minify JSON.
JSON to CSV
Convert JSON arrays of objects into CSV.
Timestamp Converter
Convert Unix timestamps ↔ ISO and local/UTC time.
Regex Tester
Test regex matches and replacement output.
URL Encoder/Decoder
Encode/decode URL parameters safely.
Base64 Encode/Decode
Convert text to Base64 and back.
UUID Generator
Generate multiple UUIDs quickly.
Code Beautifier
Beautify HTML/CSS/JS (basic).

Developer Tools make common formatting and conversion tasks faster — especially when you work with JSON, CSV, timestamps, regex, and encoding. Instead of writing small scripts for every quick job, you can use these tools to validate, transform, and preview data in seconds.

Format and validate JSON, convert JSON arrays to CSV, encode or decode URLs, generate UUIDs, test regular expressions, and convert Unix timestamps to human-readable formats. These are everyday tasks for developers, marketers, analysts, and anyone who handles structured data. A clean tool saves time and reduces mistakes — especially when you need a quick check before pushing changes live.

Most tools are designed to run locally in your browser for speed and convenience. For accuracy, we aim for predictable outputs and clear error messages. If a tool reports invalid input, it usually means the data needs minor cleanup (missing quotes, trailing commas, wrong structure). Use the output previews to confirm results before copying.

How to use

  • Choose a developer tool below.

  • Paste your input (JSON/text/timestamp).

  • Click format/convert/validate.

  • Copy the output or download if available.

FAQ

  • Does JSON Formatter validate JSON? Yes, it formats and highlights invalid structures.

  • Can I convert nested JSON to CSV? Simple arrays work best; deep nesting may need flattening.

  • What timestamp format is supported? Unix seconds/milliseconds plus ISO formats.

  • Is regex testing real-time? Most tools update output immediately after changes.