JSON Formatter
Validate / FormatPaste broken JSON, find errors, format API payloads, and copy clean output.
ByteToolBox
Fast browser tools for JSON, Base64, hashes, UUIDs, regex, and timestamps.
Paste data, validate it, convert it, copy it back — all locally in your browser.
Base64 Encoder
Encode / DecodeEncode, decode, and inspect Base64 strings, Unicode text, and URL-safe data.
Hash Generator
SHA-256Generate SHA-256 and SHA-512 checksums for text, files, releases, and debugging.
UUID Generator
UUID v4Create UUID v4 values for APIs, test data, request IDs, and database keys.
Regex Tester
Match TestTest patterns, flags, and sample text with match feedback while you iterate.
Timestamp Converter
UTC / EpochConvert Unix timestamps, ISO dates, UTC values, and log times without guessing.
Popular developer guides
Practical references for debugging APIs, encoding data, checksums, and time formats.
ISO 8601 Dates in JSON APIs: Formatting Rules That Prevent Bugs
Use ISO 8601 correctly in JSON APIs: UTC vs offsets, fractional seconds, date-only pitfalls, and Unix timestamp interoperability.
How to Find and Fix Invalid JSON With Real Error Examples
Fix invalid JSON with real examples: trailing commas, missing quotes, bad escaping, comments, and mismatched brackets.
Base64URL in JWTs and APIs: Encoding Rules Developers Miss
Learn how Base64URL differs from Base64, why JWTs use it, how padding works, and common API encoding mistakes.
How to Verify File Integrity with SHA-256 Checksums
Learn how SHA-256 checksums verify file integrity, how to compare hashes safely, and mistakes to avoid with downloads and releases.
Why ByteToolBox?
Lightning Fast
Instant processing with zero server round-trips
Privacy First
Your data never leaves your device
Always Available
Works offline once loaded
Copy-Ready Output
Paste in, validate or convert, copy results back to your editor