JSON Viewer
Format, validate and inspect JSON data in a readable expandable structure, with syntax feedback for invalid input.
Developer toolsOpenDeveloper tools
Developer and coding tools
Format, validate, encode, test and generate common developer data and identifiers.
20 focused tools
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XML, YAML and TOML Converter
Convert data using input format, output format, and data.
Developer toolsOpenCSV Viewer and Validator
Validate csv using csv data and delimiter.
Developer toolsOpenSQL Formatter
Format pasted SQL into a cleaner, more readable layout using the selected formatting style.
Developer toolsOpenCode Formatter and Minifier
Process code using language, action, and code.
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
Encode reserved characters as HTML entities or decode HTML entities back into readable text.
Developer toolsOpenUnicode Escape Converter
Convert unicode using direction and text.
Developer toolsOpenHash and HMAC Generator
Generate digest using algorithm, hmac secret, and input.
Developer toolsOpenUUID and ULID Generator
Generate identifiers using identifier type and quantity.
Developer toolsOpenJWT Decoder
Decode JSON Web Token headers and payloads locally without verifying the signature.
Developer toolsOpenCron Expression Generator
Generate cron using frequency, minute, hour, weekday, and day of month.
Developer toolsOpenHTTP Status Code Reference
Look up HTTP status codes with their meaning, response category and practical protocol notes.
Developer toolsOpenMIME Type Lookup
Look up a common MIME type from a filename or extension and review the matching extension information.
Developer toolsOpenJSONPath Tester
Run a JSONPath expression against pasted JSON and inspect the matched value or any parsing and evaluation error.
Developer toolsOpenXPath Tester
Run an XPath expression against pasted XML and inspect matched nodes, values or parsing errors.
Developer toolsOpenQR Code Generator
Create QR codes for links, text, Wi-Fi, contact details and downloads in seconds.
Developer toolsOpenBarcode Generator
Generate barcode using barcode value, format, and bar height.
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 expandable structure, with syntax feedback for invalid input.
- 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.