/tools/developer

⌨ Developer Tools

The small utilities that come up a dozen times a day. All of them run locally, which matters when the thing you are debugging is an API response containing a token.

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JSON Formatter

Format, indent and validate JSON with precise error locations.

/tools/json-formatter

JSON Validator

Check whether JSON is valid and see exactly where it breaks.

/tools/json-validator

Base64 Encoder

Encode text or files to Base64, with URL-safe output available.

/tools/base64-encoder

Base64 Decoder

Decode Base64 back to text, with automatic URL-safe detection.

/tools/base64-decoder

Timestamp Converter

Convert Unix timestamps to dates and back, in any time zone.

/tools/timestamp-converter

Regex Tester

Test regular expressions live, with highlighted matches and groups.

/tools/regex-tester

UUID Generator

Generate cryptographically random UUIDs in bulk.

/tools/uuid-generator

Color Converter

Convert colours between HEX, RGB, HSL and HSV with a live preview.

/tools/color-converter

URL Encoder

Percent-encode text for URLs, query strings and form data.

/tools/url-encoder

URL Decoder

Decode percent-encoded URLs and break them into parts.

/tools/url-decoder

JSON Minifier

Strip whitespace from JSON and see how many bytes you saved.

/tools/json-minifier

HTML Formatter

Indent and tidy HTML markup, or minify it back down.

/tools/html-formatter

CSS Formatter

Beautify or minify CSS, with comment and string handling.

/tools/css-formatter

JavaScript Formatter

Re-indent JavaScript so nesting and blocks are readable.

/tools/javascript-formatter

About developer tools

These are deliberately narrow tools. A JSON formatter should format JSON, load instantly and tell you precisely where the syntax broke — not open a project workspace. Every tool here does one job, works without an account, and keeps your data on your machine.

That last point is the reason to prefer a client-side tool for this category specifically. Developers paste production data into formatters and decoders constantly: API responses, JWTs, log lines, config files. Anything pasted into a server-side tool has left your control. Nothing here makes a network request with your input.

The tools also try to explain rather than just transform. The regex tester shows capture groups and match positions, the encoders explain which mode to pick, and the formatters report what changed and why.