gnext.devThe Developer Toolbox
Fast utilities and practical references for everyday development. Format JSON, decode a JWT, test a regex, build a cron schedule, convert a timestamp. Most tools run entirely in your browser.
- Tools17
- Processed in your browser17 of 17
- References & guides7
- Accounts, uploads, trackersnone
Press / or Ctrl K anywhere on the site to search.
Popular
All tools- 01JSON FormatterPretty-print, minify and validate JSON with exact error positions.
- 02JWT DecoderDecode a JSON Web Token, read its claims and check expiry. Optional HS256 check.
- 03Regex TesterTest JavaScript regular expressions with live match highlighting and groups.
- 04Cron Expression BuilderBuild a cron schedule from a form and see the expression and next runs.
- 05Base64 Encoder / DecoderEncode text to Base64 or decode it back, with URL-safe and UTF-8 handling.
- 06UUID GeneratorGenerate UUID v4 and time-ordered UUID v7 values in bulk.
- 07Unix Timestamp ConverterConvert epoch seconds or milliseconds to dates and back, in UTC and local time.
Directory
Data
Format, validate, inspect and convert structured data.
Encoding
Encode and decode text for transport and URLs.
Security
Inspect tokens and compute hashes, locally.
Generators
Identifiers and random values from a secure source.
Development
Test and debug everyday development inputs.
Time
Timestamps, epochs and date representations.
Network
Addressing and subnet math.
DevOps
Scheduling and Unix system utilities.
Reference
Standards-backed pages you return to.
How GNext works
Your input stays on your device
Every launch tool runs as JavaScript in your browser. Formatting, decoding and hashing happen locally; nothing you paste is uploaded or logged. Each tool page states this explicitly, and the privacy page explains the site-wide posture.
Purpose-built interfaces
A subnet calculator is not a JSON formatter with different labels. Each tool has controls that match the job: a permissions grid for chmod, a field-by-field builder for cron, a collapsible tree for JSON.
Errors that say what is wrong
Invalid JSON reports the line, the column and the likely cause. A JWT decoder tells you it has not verified the signature. References cite the RFC they are based on.