45+ Developer tools that build faster

Pretty print and format JSON instantly, with precise error positions.

Test a pattern against sample text and see every match highlighted as you type.

Check JSON syntax and get the exact line and column of the first error.

Indent and align XML so a one-line document becomes readable.

Normalise indentation and quoting across a YAML file.

Strip whitespace from JSON down to the smallest valid payload.

Run a JSONPath query against a document and see every match highlighted.

Open a CSV as a sortable table without launching a spreadsheet.

Check XML for well-formedness and report the line of the first problem.

Catch the indentation and tab errors YAML is famous for.

Fix quoting, delimiters and line endings in a messy CSV export.

Paste a raw HTTP header block and see every header named and split out.

Encode text to Base64, or decode it back, instantly.

Percent-encode a string for a URL, or decode one back.

Escape text to HTML entities, or decode entities back to text.

Move between literal characters and \u escape sequences.

Decode JWT tokens safely in your browser — header, payload and expiry.

Generate SHA-256, SHA-512 and MD5 hashes from text or a file.

Build a strong random password with the character rules you need.

Sign a token with your own claims and secret for local testing.

Score a password on entropy, character variety and common weak patterns.

Encrypt and decrypt a block of text with AES and a passphrase.

Generate RFC 4122 UUID v4 values, one at a time or up to 50 at once.

Infer a JSON Schema from a sample document, ready to validate against.

Build realistic test records — names, emails, addresses — as JSON, from a seeded generator.

Build a cron schedule from plain fields and read a plain-English description back.

Indent and tidy markup by tag nesting depth, void elements handled correctly.

Reindent a stylesheet, one declaration per line, so it reads the same everywhere.

Break a one-line query into readable clauses and keywords.

Catch unclosed tags and invalid nesting before a browser has to guess.

Strip comments and whitespace down to the smallest stylesheet.

Normalise heading spacing and list markers in a Markdown file, without touching your wording.

Convert Unix timestamps to readable dates, and back again.

Turn a spreadsheet export into JSON objects, or JSON back into CSV.

Rewrite a JSON payload as YAML for a config file.

Map JSON keys onto XML elements — arrays become repeated siblings, no attribute support.

Turn a JSON sample into TypeScript interfaces you can paste into a project.

Convert a YAML config into JSON an API will accept.

Flatten an XML document into workable JSON.

Convert a number between binary, octal, decimal and hexadecimal.