JSON Viewer
Validate JSON and explore its structure in an expandable tree.
Developer toolsOpenDeveloper tools
Developer and coding tools
Format, validate, encode, test and generate common developer data and identifiers.
20 focused tools
All toolsChoose a tool
XML, YAML and TOML Converter
Use xml, yaml and toml converter directly in your browser with clear inputs and an exportable result.
Developer toolsOpenCSV Viewer and Validator
Use csv viewer and validator directly in your browser with clear inputs and an exportable result.
Developer toolsOpenSQL Formatter
Use sql formatter directly in your browser with clear inputs and an exportable result.
Developer toolsOpenCode Formatter and Minifier
Use code formatter and minifier directly in your browser with clear inputs and an exportable result.
Developer toolsOpenRegex Tester
Test regular expressions, inspect matches and preview replacements against pasted text.
Developer toolsOpenBase64 Encoder/Decoder
Encode UTF-8 text to Base64 or decode Base64 back to readable text.
Developer toolsOpenURL Encoder/Decoder
Encode or decode URL components containing spaces, symbols and Unicode text.
Developer toolsOpenHTML Entity Encoder and Decoder
Use html entity encoder and decoder directly in your browser with clear inputs and an exportable result.
Developer toolsOpenUnicode Escape Converter
Use unicode escape converter directly in your browser with clear inputs and an exportable result.
Developer toolsOpenHash and HMAC Generator
Use hash and hmac generator directly in your browser with clear inputs and an exportable result.
Developer toolsOpenUUID and ULID Generator
Use uuid and ulid generator directly in your browser with clear inputs and an exportable result.
Developer toolsOpenJWT Decoder
Decode JSON Web Token headers and payloads locally without verifying the signature.
Developer toolsOpenCron Expression Generator
Use cron expression generator directly in your browser with clear inputs and an exportable result.
Developer toolsOpenHTTP Status Code Reference
Use http status code reference directly in your browser with clear inputs and an exportable result.
Developer toolsOpenMIME Type Lookup
Use mime type lookup directly in your browser with clear inputs and an exportable result.
Developer toolsOpenJSONPath Tester
Use jsonpath tester directly in your browser with clear inputs and an exportable result.
Developer toolsOpenXPath Tester
Use xpath tester directly in your browser with clear inputs and an exportable result.
Developer toolsOpenQR Code Generator
Create downloadable QR codes for URLs, text, Wi-Fi networks and contact cards.
Developer toolsOpenBarcode Generator
Use barcode generator directly in your browser with clear inputs and an exportable result.
Developer toolsOpenWhat this category covers
Coding tools focus on structured input, syntax and transformations used in development work. They support quick inspection and learning without executing arbitrary code from an article or tool result.
Recommended starting tools
- JSON Viewer — Format, validate and inspect JSON data in a readable structured view.
- Regex Tester — Test regular expressions, inspect matches and preview replacements against pasted text.
- HTML Viewer — Preview HTML inside a sandboxed frame without running scripts.
How to choose
Validate untrusted input, minimise a failing case and compare the processed output with the original before copying it into a project.
Frequently asked questions
Does the HTML viewer execute pasted JavaScript?
Use it only for the safe preview behaviour described on its page; article code previews never execute injected code.
Can I paste access keys?
No. Use fabricated or redacted examples for any online debugging tool.