Tools / Developer Utility Tools
Developer Utility Tools
Developer tools are lightweight utilities for day-to-day engineering: format or diff JSON, encode Base64, hash strings, decode JWT, test regex, convert CSV/Excel, validate emails and phones, generate IDs, and sanitize HTML.
Many text utilities work without an account. Spreadsheet converters and heavier checks use credits like other FatBaby products. Prefer the Spreadsheet API or Email Validation API landings when embedding these into backends.
Popular Developer Tools
High-intent utilities in this category.
JSON Formatter
0 crPretty-print or minify JSON in the browser — no API key needed.
Open tool →JSON Diff
0 crCompare two JSON documents with side-by-side highlighting and path-level changes.
Open tool →Hash Generator
0 crGenerate MD5, SHA-1, SHA-256, and other hashes.
Open tool →Base64 Encode / Decode
0 crEncode or decode Base64 strings.
Open tool →Excel → CSV
1 crConvert an .xlsx workbook sheet to CSV.
Open tool →Email Validator
0 crCheck email syntax, MX records, and disposable domains.
Open tool →All Developer Tools
33 live tools — each links to a full SEO landing with the working UI.
JSON Formatter
livePretty-print or minify JSON in the browser — no API key needed.
0 credits · Open →JSON Diff
liveCompare two JSON documents with side-by-side highlighting and path-level changes.
0 credits · Open →Base64 Encode / Decode
liveEncode or decode Base64 strings.
0 credits · Open →Hash Generator
liveGenerate MD5, SHA-1, SHA-256, and other hashes.
0 credits · Open →Phone Validator
liveValidate and format phone numbers (E.164). No carrier lookup.
0 credits · Open →URL Shortener
liveCreate a short redirect link for a public HTTPS URL.
1 credits · Open →Email Validator
liveCheck email syntax, MX records, and disposable domains.
0 credits · Open →Disposable Email Checker
liveDetect temporary / disposable email domains.
0 credits · Open →Email Deliverability Score
liveScore a domain from MX, SPF, DMARC, and disposable signals.
0 credits · Open →Strip Tracking Params
liveRemove utm_*, gclid, fbclid and similar tracking params.
0 credits · Open →JWT Decode
liveDecode a JWT without verifying the signature.
0 credits · Open →Password Generator
liveGenerate a CSPRNG password.
0 credits · Open →UUID Generator
liveGenerate a UUID v4.
0 credits · Open →NanoID Generator
liveGenerate a NanoID token.
0 credits · Open →Regex Tester
liveTest a regular expression safely (ReDoS limits).
0 credits · Open →CSV ↔ JSON
liveConvert CSV to JSON or JSON to CSV.
0 credits · Open →Markdown → HTML
liveConvert Markdown to sanitized HTML.
0 credits · Open →HTML Sanitize
liveStrip dangerous HTML (scripts, etc.).
0 credits · Open →Text Case Converter
liveConvert text to camel, snake, kebab, and more.
0 credits · Open →Slugify
liveMake a URL-safe slug from text.
0 credits · Open →Text Diff
liveDiff two text strings line-by-line.
0 credits · Open →Word Counter
liveCount characters, words, and lines.
0 credits · Open →Cron Explainer
liveValidate a cron expression and show next runs.
0 credits · Open →Color Contrast
liveWCAG contrast ratio between two hex colors.
0 credits · Open →IBAN Checker
liveValidate IBAN format with Mod-97 checksum.
0 credits · Open →Luhn / Card Format Check
liveLuhn checksum for card-like numbers (format only).
0 credits · Open →User-Agent Parser
liveHeuristic browser / OS / bot detection from a UA string.
0 credits · Open →WiFi QR Code
liveGenerate a WiFi login QR code.
1 credits · Open →vCard QR Code
liveGenerate a contact vCard QR code.
1 credits · Open →Barcode Generator
liveGenerate Code128 / EAN / UPC barcodes.
1 credits · Open →Excel → CSV
liveConvert an .xlsx workbook sheet to CSV.
1 credits · Open →Excel → JSON
liveConvert an .xlsx sheet to JSON rows.
1 credits · Open →CSV → Excel
liveConvert CSV text into an .xlsx file.
1 credits · Open →What you can do
- Format, minify, and diff JSON
- Hash, Base64, JWT decode, UUID/NanoID generators
- CSV ↔ JSON and Excel ↔ CSV/JSON conversions
- Email, phone, IBAN, and Luhn checks
- QR/barcode helpers for WiFi and vCards
Common use cases
- Debugging API payloads
- Normalizing partner CSV/XLSX files
- Signup form validation experiments
- Generating QR codes for staging environments
Build with the Developer API
Every tool maps to a REST operation on TheFatBaby. Get an API key, read the docs, and keep the same credit wallet.
FAQ
Which developer tools need sign-in?
Guest-friendly text utilities often work without an account. File uploads and billable checks require sign-in.