Developer Tools
Format JSON, test regex, decode JWTs, and generate passwords without pasting secrets into a random upload form. Tools run in your browser.
JSON Formatter
Paste JSON to validate, beautify, or minify instantly — privately on your device.
DeveloperInstantRegex Tester
Write a pattern, set flags, and see matches and groups update live.
DeveloperInstantDiff Checker
Find differences between two text files with unified or split views — like GitHub.
DeveloperInstantPassword Generator
Create cryptographically random passwords with length and character-set controls.
DeveloperInstantJWT Decoder
Paste a JWT to inspect header, payload, and expiry — locally.
DeveloperInstantHash Generator
Hash text for checksums and cache keys — locally with Web Crypto (MD5 for legacy checksums only).
DeveloperInstantBase64 Encode / Decode
Convert text to Base64 and back — including URL-safe variants.
DeveloperInstantUUID Generator
Create one or many UUID v4 values for fixtures, IDs, and test data.
DeveloperInstantURL Encoder / Decoder
Encode or decode URI components for query strings and path segments.
DeveloperInstantCron Expression Generator
Assemble a standard cron schedule and get a plain-English field summary.
DeveloperInstantYAML Formatter
Beautify and validate YAML — then copy JSON if you need it.
DeveloperInstantSQL Formatter
Break long SQL onto keyword lines for readable diffs and reviews.
DeveloperInstantJWT Generator
Build a signed HS256 JWT from header claims, payload, and a secret.
DeveloperInstantURL Parser
Split a URL into components and query parameters for debugging.
DeveloperInstantJSON Diff
Diff two JSON trees by path — locally, without uploading payloads.
DeveloperInstantCron Parser
Explain minute, hour, day, month, and weekday fields from any classic cron string.
DeveloperInstant
How these developer tools work
Utilities run with JavaScript and Web APIs (including Web Crypto where stated). Tokens and passwords are not sent to The ToolSphere servers for supported tools. Read our Privacy Policy.
Who these tools are for
Developers, PMs, and QA who need quick local helpers during debugging—especially when payloads contain credentials.
FAQ
Is my JWT or password uploaded?expand_more
No for supported tools. Decoding and generation happen in your browser. Still treat secrets carefully on shared machines.
Do I need an account?expand_more
No.
Are password results stored?expand_more
No. Generated passwords stay in your session until you copy or clear them. See each tool’s disclaimer.
Guides and related tools
Looking for something else? Browse all tools · Read the blog.