Developer tools on LaiUse cover the everyday utilities every programmer, engineer, and web developer reaches for. Format JSON for debugging APIs, test regular expressions against sample input, encode/decode Base64 strings, generate UUIDs for database primary keys, parse cron expressions for scheduled jobs, and convert between YAML, TOML, CSV, and XML data formats. Every developer tool runs entirely in your browser — your code, configuration, and data never leave your device, which makes LaiUse ideal for working with sensitive API responses, internal configurations, or any code you don't want uploaded to a third-party server. All developer tools are free with no signup required.
Encode and decode Base32 strings — RFC 4648 compliant. Works with any text input.
Encode and decode Base58 strings — Bitcoin alphabet, no confusing characters (0, O, I, l).
Encode or decode Base64 strings instantly. Works with text, files, and images — all processing done locally in your browser.
Convert BBCode to HTML. Supports bold, italic, links, images, colors, sizes, and formatting tags.
Generate hashes for multiple files at once. Supports MD5, SHA-1, SHA-256, SHA-512 — perfect for checksum verification.
Generate multiple UUIDs at once. Export as JSON, CSV, or plain text for bulk data seeding and testing.
Convert text between case formats: camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, and more.
Simulate how your images appear to people with different types of color blindness. Upload an image and see 8 vision types.
Pick colors and explore palettes. Convert between HEX, RGB, HSL, and HSV formats with a live color preview.
Convert natural language into cron expressions instantly. Type "every day at 9am" or "weekdays at 3pm" and get a valid cron expression.
Parse and validate cron expressions. See the next 5 execution times and understand what your cron job schedule means.
Format and minify CSS code instantly. Beautify messy stylesheets with proper indentation or compress CSS for production. All local.
Convert CSV data to JSON and JSON back to CSV. Handles headers, quoted fields, and type inference.
Get embed code for the Base32 Encoder — RFC 4648 base32 on your site.
Get embed code for the Base58 Encoder — Bitcoin-style base58 on your site.
Get embed code for the Base64 Encoder — add free Base64 encode/decode to your site.
Get embed code for the BBCode→HTML converter — for forum/documentation sites.
Get embed code for the Case Converter — camelCase/snake_case/kebab-case for your site.
Get embed code for the Color Blindness Simulator — accessibility preview for your design site.
Get embed code for the Color Picker — HEX/RGB/HSL conversions on your design site.
Get embed code for the Cron Expression Generator — natural language → cron for your site.
Get embed code for the Cron Expression Parser — explain cron strings to your users.
Get embed code for the CSS Beautifier — format/minify CSS on your site.
Get embed code for the CSV↔JSON converter — data format tools for your docs.
Get embed code for the Emoji Picker — 500+ emojis for your community site.
Get embed code for the Hash Generator — add free MD5/SHA-256/SHA-512 to your site.
Get embed code for the HTML Beautifier — pretty HTML on your site.
Get embed code for the HTML Entities encoder/decoder — add to your dev docs.
Get embed code for the HTML Formatter — beautify & minify HTML on your site.
Get embed code for the HTML Minifier — shrink HTML for production on your site.
Get embed code for the JavaScript Beautifier — format/minify JS on your site.
Get embed code for the JSON→CSV converter — flatten JSON to spreadsheets.
Get embed code for the JSON→XML converter — interchange tools for your docs.
Get embed code for the JSON Path Query tool — JSONPath playground for your docs.
Get embed code for the Line Sorter — sort/dedupe/reverse text lines on your site.
Get embed code for the Lorem Ipsum Generator — placeholder text for your mockups.
Get embed code for the Markdown→HTML converter — let visitors convert MD to HTML.
Get embed code for the Regex Tester — add a free regex playground to your blog.
Get embed code for the Reverse String tool — for language learning or puzzle sites.
Get embed code for the Slug Generator — URL-safe permalinks for your CMS.
Get embed code for the SQL Formatter — beautify SQL queries on your blog.
Get embed code for the Text Diff tool — let visitors compare texts on your site.
Get embed code for the Timestamp Converter — Unix/epoch conversions on your site.
Get embed code for the TOML↔JSON converter — config format tools for your docs.
Get embed code for the UUID Generator — add free UUID v1/v4/v7 to your site.
Get embed code for the Word Counter — word/char/reading-time stats on your site.
Get embed code for the XML↔JSON converter — interchange tools for your docs.
Get embed code for the YAML↔JSON converter — config format tools for your docs.
Browse and search 500+ emojis by category. Click to copy any emoji to clipboard instantly.
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) from text or files. Verify file integrity instantly.
Beautify HTML code with proper indentation using js-beautify.
Encode and decode HTML entities — convert special characters to HTML entity codes and back.
Format and prettify HTML code with proper indentation. Clean up minified HTML and make it readable instantly.
Minify HTML by removing whitespace and comments.
Format and minify JavaScript code instantly. Beautify minified scripts or compress your JS for production. Supports ES6+, async/await, and template literals. All local.
Format, validate, and prettify JSON data. Minify JSON, sort keys, and explore nested structures with a tree view.
Query and extract data from JSON using JSONPath expressions. Explore nested structures, filter arrays, and get results instantly.
Convert JSON data to CSV format. Flatten nested objects, handle arrays, download as .csv file.
Convert JSON to XML format. Generate valid XML documents from JSON data for easy integration.
Decode and inspect JSON Web Tokens (JWT). View header, payload, and signature — verify token claims without sending data anywhere.
Sort lines alphabetically, remove duplicates, reverse order, or shuffle. Perfect for cleaning lists.
Generate placeholder text instantly. Choose sentence count, paragraph count, and format — perfect for design mockups and prototyping.
Convert Markdown to HTML. Supports headers, bold, italic, links, lists, code blocks, blockquotes, and more.
Measure any webpage HTML size — total bytes, script/style/whitespace breakdown, and resource counts.
Test and debug regular expressions in real-time. See matches highlighted, capture groups extracted, and common regex patterns.
Reverse characters or words in any text. See a visual character map with position indices.
Format and minify SQL queries. Supports SELECT, INSERT, UPDATE, DELETE with proper indentation.
Compare two texts and see differences highlighted — added, removed, and unchanged lines side by side.
Convert between Unix timestamps and human-readable dates. Supports multiple timezones and custom date formats.
Convert between TOML and JSON formats. TOML is a minimal config file format easy to read and write.
Generate UUIDs (Universally Unique Identifiers) instantly. Supports UUID v1, v4, and v7 formats.
Count words, characters, sentences, paragraphs. Get reading time, speaking time, and character frequency analysis.
Convert XML to JSON and JSON to XML. Uses browser DOMParser for accurate XML parsing.
Convert between YAML and JSON formats. Supports nested objects, arrays, and all YAML data types.