JSON Formatter & Validator
Format and validate JSON payloads instantly with readable output.
Open ToolDeveloper Tools — Free Online Dev Utilities
Format, validate, encode, decode, and generate developer data instantly in your browser.
Featured Developer Tools
Base64 Encode / Decode
Encode text to Base64 or decode Base64 quickly without uploads.
Open ToolQR Code Generator
Create QR output for dev testing, URLs, and payload sharing.
Open ToolUUID Generator
Generate v4 UUID values quickly for test data and records.
Open ToolRegex Tester
Test JavaScript regex patterns and inspect matches instantly.
Open ToolJWT Decoder
Decode and inspect JWT tokens instantly. View header, payload, and signature.
Open ToolAll Developer Tools
JSON Formatter & Validator
Beautify, validate, and minify JSON in one view.
Open ToolBase64 Encode / Decode
Convert text data to and from Base64 immediately.
Open ToolQR Code Generator
Generate QR output for links and payload transport.
Open ToolUUID Generator
Generate random UUID values for app records.
Open ToolRegex Tester
Validate regex patterns against sample input and capture groups.
Open ToolJWT Decoder
Decode and inspect JWT tokens instantly. View header, payload, and signature.
Open ToolUnix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Open ToolHTML Encode / Decode
Encode special characters to HTML entities or decode them back.
Open ToolNumber Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
Open ToolCron Expression Generator
Build and validate cron expressions with a visual editor.
Open ToolCommon developer use cases
API Development
- Format JSON responses
- Validate payload structures
- Convert response formats
Security & Encoding
- Encode data with Base64
- Generate secure random passwords
- Prepare payloads for transfer
Data Engineering
- Validate JSON structures
- Prepare conversion-ready payloads
- Generate identifiers for records
Testing & Debugging
- Inspect and normalize payloads
- Create QR links for device testing
- Quickly share generated output
Online developer tools that are fast, private, and practical
ToolCrux developer utilities are built for engineers who need instant results without setup overhead. These browser-based developer tools help with everyday tasks such as JSON formatting, encoding workflows, payload cleanup, and quick generation utilities. If you need a JSON formatter online for API debugging or encoding tools online for transport-safe values, this category centralizes the fastest paths.
Unlike heavyweight desktop stacks for simple operations, free dev utilities on ToolCrux are optimized for low friction and quick turnaround. You open a tool, run the operation, copy the output, and continue. For repeat workflows, this page acts as a structured hub to reduce context switching and increase delivery speed across development, QA, and data tasks.
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FAQ
What does the JSON Formatter do with invalid JSON?
It catches the syntax error and displays the exact error message and position, so you can pinpoint and fix the issue. No output is produced until the JSON is valid.
What version of UUID does the generator create?
It generates version 4 UUIDs, which are randomly generated and suitable for most use cases — database primary keys, session tokens, and unique identifiers in distributed systems.
Does the Regex Tester support all JavaScript regex features?
Yes. It runs your pattern through the browser's native JavaScript regex engine, so it supports all flags (g, i, m, s, u) and features your browser supports, including named capture groups and lookbehinds.
Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme that converts binary data to text for safe transport. It is not encryption — anyone can decode Base64 without a key. Never use it to protect sensitive data.
Can I generate QR codes for Wi-Fi passwords or contact cards?
The QR Code Generator accepts any text input, so you can paste Wi-Fi config strings, vCard data, URLs, or plain text. The generated QR code can be downloaded as a PNG image.