20 tools

Developer tools

Free online developer tools for formatting JSON, decoding JWTs, generating UUIDs, working with HTTP, encoding data, timestamps, hashes, regex, and more. All tools run locally in your browser.

20 ready tools

Runs locally

No signup

Searchable

20 developer tools

JSON FormatterReadyFormat, validate, and sort JSON locally.Open tool

JSON to TypeScriptReadyGenerate TypeScript interfaces from JSON.Open tool

UUID GeneratorReadyGenerate UUIDs locally.Open tool

Hash GeneratorReadyGenerate and compare SHA hashes locally.Open tool

Timestamp ConverterReadyConvert Unix timestamps locally.Open tool

Cron Expression BuilderReadyBuild and explain cron schedules locally.Open tool

Base ConverterReadyConvert binary, decimal, hex, and more locally.Open tool

JWT DecoderReadyDecode JWTs locally.Open tool

Base64 Encoder/DecoderReadyEncode and decode Base64 locally.Open tool

HTML EntitiesReadyEncode and decode HTML entities locally.Open tool

HTML/CSS PlaygroundReadyPreview HTML, CSS, JavaScript, and console output locally.Open tool

HTTP Status LookupReadyLook up HTTP response codes locally.Open tool

Regex TesterReadyTest regex matches and replacements locally.Open tool

Markdown PreviewReadyPreview and export Markdown locally.Open tool

SVG PreviewReadyPreview, inspect, and export SVG locally.Open tool

XML FormatterReadyFormat and minify XML locally.Open tool

YAML to JSONReadyConvert YAML into JSON locally.Open tool

CSV to JSONReadyConvert CSV to JSON locally.Open tool

JSON to CSVReadyConvert JSON to CSV locally.Open tool

CSV CleanerReadyClean CSV data locally.Open tool

Guide

About developer tools

Developer tools help with quick format, encode, decode, inspect, and generate tasks that interrupt normal coding work.

Use them for JSON, JWTs, Base64, HTTP status codes, regular expressions, timestamps, UUIDs, hashes, Markdown, SVG, and other browser-safe checks.

FAQ

Developer tools FAQ

Do developer tools upload code or data?

No. Developer utilities are designed to run locally in your browser unless a specific tool clearly states otherwise.

Can I paste private JSON, tokens, or logs?

The tools do not upload your input, but you should still avoid pasting secrets into any website unless you are comfortable with the local browser environment.

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