Format, encode and check code and data

Format JSON, convert between JSON, CSV, XML and YAML, encode or decode Base64 and URLs, test a regular expression, or build a cron schedule you can read back in plain English — in your browser, with no account.

17 tools in this category.

Questions these tools answer

How do I format and validate JSON?
How do I convert JSON to CSV?
How do I encode or decode Base64?
How do I test a regular expression?
How do I build a cron schedule I can read?

Looking for a job rather than a format? Browse tools by everyday job.

JSON formatter/validator

Format, validate and minify JSON, with clear error messages when the JSON is invalid. Runs entirely in your browser.

Developer tools

JSON to CSV

Convert a JSON array of objects into a CSV file you can open in a spreadsheet.

Developer tools

CSV to JSON

Convert CSV data into formatted JSON, with a preview of the result.

Developer tools

XML to JSON / JSON to XML

Convert XML data to JSON, and JSON data back to XML, in your browser.

Developer tools

YAML to JSON / JSON to YAML

Convert YAML data to JSON, and JSON data back to YAML, in your browser.

Developer tools

Base64 encode/decode

Encode text to Base64 and decode Base64 back to text. Note: Base64 is encoding, not encryption.

Developer tools

URL encode/decode

Percent-encode a URL or query string, and decode encoded URLs back to readable text.

Developer tools

HTML/CSS/JS minifier and beautifier

Minify HTML, CSS and JavaScript to a smaller size, or beautify code into readable form with a real parser.

Developer tools

Regex tester

Test a regular expression live against your text, with matches highlighted and groups shown.

Developer tools

JWT decoder

Decode a JSON Web Token and show its header and payload. Tokens are decoded on your device only — never upload a real token to an untrusted site.

Developer tools

Hash generator

Generate SHA-256 digests for text using your browser's built-in cryptography, plus MD5 via a simple implementation where available. MD5 and SHA-1 are legacy checksums, not secure hashing.

Developer tools

UUID generator

Generate random UUIDs in bulk, in the standard format, for development and testing.

Developer tools

Unix timestamp converter

Convert Unix timestamps (seconds and milliseconds) to readable dates, and dates back to timestamps.

Developer tools

Color converter

Pick a colour and convert it between HEX, RGB and HSL, with a live preview.

Developer tools

CSS gradient / box-shadow generator

Design a CSS gradient or a box shadow with sliders and a live preview, then copy the CSS.

Developer tools

Cron expression builder

Build a cron schedule from plain choices, check it is valid, and read it back in plain English — no cron syntax to memorise.

Developer tools

SQL formatter

Format SQL into readable, indented code with keywords in capitals, and download the formatted query as a .sql file.

Developer tools