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Format JSON, encode data, test regex, decode JWT, and more.
31 tools in this category
Developer tools on AllToolHub focus on everyday encoding, validation, and data chores: format and validate JSON, convert CSV ↔ JSON, encode Base64 and URLs, decode JWTs, test regular expressions, generate UUIDs, and work with timestamps or cron expressions.
They are built for quick local use in the browser - useful when you do not want to paste secrets into an unknown website without understanding where data goes. Prefer tools that keep processing on-device for sensitive tokens and payloads.
Choose a developer utility below - built for speed and local processing.
Formatting runs in your browser. Still avoid pasting highly sensitive secrets on shared or untrusted devices.
The JWT decoder is for inspection of encoded segments. Signature verification and production auth belong in your application stack.
31 tools in this category
JSON & Developer Tools
Format messy JSON with configurable indentation — validate and pretty-print in one step.
JSON & Developer Tools
Validate JSON with clear syntax errors, root type, and size info.
JSON & Developer Tools
Pretty-print compact JSON for readability with a simple one-click layout.
JSON & Developer Tools
Minify JSON by stripping whitespace for smaller payloads and APIs.
JSON & Developer Tools
Visually compare two JSON documents with side-by-side highlighting.
JSON & Developer Tools
Explore JSON as a collapsible tree with expand/collapse all.
JSON & Developer Tools
Convert CSV to JSON with optional type inference and pretty-print.
JSON & Developer Tools
Convert JSON arrays to Excel-friendly CSV with BOM and formula-safe cells.
JSON & Developer Tools
Encode text to Base64 with optional URL-safe (Base64URL) mode.
JSON & Developer Tools
Decode Base64 or Base64URL strings to text.
JSON & Developer Tools
Percent-encode strings for query values, full URIs, or form data.
JSON & Developer Tools
Decode percent-encoded URL strings (optional + as space).
JSON & Developer Tools
Escape HTML special characters to entities.
JSON & Developer Tools
Decode HTML entities back to characters.
JSON & Developer Tools
Generate UUID v4 identifiers with format options (hyphens, case, braces).
JSON & Developer Tools
Decode JWT header and payload with iat/exp helpers (no verification).
JSON & Developer Tools
Build and sign JWTs with HS256 or create unsigned tokens.
JSON & Developer Tools
Test regular expressions with live match highlighting and export.
JSON & Developer Tools
Convert between Unix timestamps and human-readable dates.
JSON & Developer Tools
Convert timestamps across milliseconds and seconds.
JSON & Developer Tools
Build and explain common cron expressions.
JSON & Developer Tools
Explain a cron expression and list the next run times locally.
JSON & Developer Tools
Convert between YAML and JSON with pretty output.
JSON & Developer Tools
Beautify XML markup with indentation controls.
JSON & Developer Tools
Validate XML and show clear parse errors.
JSON & Developer Tools
Pretty-print SQL with dialect and keyword options.
JSON & Developer Tools
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes on one page.
JSON & Developer Tools
Convert .env files to JSON objects and back.
JSON & Developer Tools
Break a URL into parts and list query parameters in a table.
JSON & Developer Tools
Convert between px, rem, and em with custom base sizes.
JSON & Developer Tools
Generate fake API JSON for users, products, posts, and custom schemas.