Data Formatting & Conversion Toolkit for Developers
Format. Convert. Right in your browser.
Format JSON, convert YAML ⇄ JSON, clean CSV, transform data and test regex — 100% in your browser, instant, free.
DevFormatLab is a focused toolkit for developers who work with data every day. JSON, YAML, CSV, XML and regex — formatted, converted and validated instantly, with nothing ever leaving your device.
Popular Tools
Frequently usedJSON Formatter
Format · Minify · Validate
Format, minify, validate and beautify JSON with inline error highlighting.
JSON Diff
Compare · Highlight changes
Compare two JSON documents side-by-side with line-level highlighting and key sorting.
CSV Cleaner
Clean · UTF-8 ↔ Shift-JIS
Remove duplicates, empty rows, trim whitespace, convert UTF-8 ↔ Shift-JIS.
YAML Converter
YAML ⇔ JSON ⇔ Properties
Convert YAML ↔ JSON and YAML ↔ Java .properties with strict validation.
Base64 Encode / Decode
Text · File · URL-safe
Encode and decode Base64 (and Base64URL) for text or files. Real-time, browser-only.
URL Encode / Decode
Percent-encode · Decode · Query-safe
Encode and decode URLs, query strings and URI components with percent-encoding and form-style spaces.
Hash Generator
MD5 · SHA-1 · SHA-256
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or files in your browser.
Timestamp Converter
Unix ↔ Date · Multi-timezone
Convert Unix timestamps (seconds or milliseconds) to and from human-readable dates across timezones.
JWT Decoder
Decode · Inspect · Verify timing
Decode JSON Web Tokens to inspect header, payload and signature, with readable timestamps and expiry status.
Regex Tester
Real-time matching
Test regular expressions in real time with match highlighting and presets.
All Utilities
Everything availableJSON Formatter
Format · Minify · Validate
Format, minify, validate and beautify JSON with inline error highlighting.
JSON Diff
Compare · Highlight changes
Compare two JSON documents side-by-side with line-level highlighting and key sorting.
CSV Cleaner
Clean · UTF-8 ↔ Shift-JIS
Remove duplicates, empty rows, trim whitespace, convert UTF-8 ↔ Shift-JIS.
YAML Converter
YAML ⇔ JSON ⇔ Properties
Convert YAML ↔ JSON and YAML ↔ Java .properties with strict validation.
Base64 Encode / Decode
Text · File · URL-safe
Encode and decode Base64 (and Base64URL) for text or files. Real-time, browser-only.
URL Encode / Decode
Percent-encode · Decode · Query-safe
Encode and decode URLs, query strings and URI components with percent-encoding and form-style spaces.
Hash Generator
MD5 · SHA-1 · SHA-256
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or files in your browser.
Timestamp Converter
Unix ↔ Date · Multi-timezone
Convert Unix timestamps (seconds or milliseconds) to and from human-readable dates across timezones.
JWT Decoder
Decode · Inspect · Verify timing
Decode JSON Web Tokens to inspect header, payload and signature, with readable timestamps and expiry status.
Regex Tester
Real-time matching
Test regular expressions in real time with match highlighting and presets.
JSON → String
Escape for code
Escape JSON into a string literal suitable for embedding into source code (double quotes and backslashes escaped).
Format Converters
Every direction between JSON, YAML and CSV — each as its own page.Convert JSON to YAML in your browser with strict validation.
Convert YAML to JSON in your browser with full spec support.
Convert a JSON array of objects to CSV with auto-detected headers.
Convert CSV to a JSON array of objects with typed cell values.
Convert a YAML list of objects to CSV without losing data.
Convert CSV to a YAML list of objects with typed cell values.
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