Developer Tools
Format a JSON payload, test a regex, convert CSV to JSON or minify CSS — without pasting your code into someone else’s server. These developer utilities handle the everyday glue work of programming: formatting, validating, encoding and converting. Everything runs client-side, so confidential snippets, tokens and config files stay on your machine.
39 tools, ready when you are
- JSON Formatter Format, validate, and beautify JSON with custom indentation. Developer
- URL Encoder & Decoder Encode text for URLs or decode URL-encoded strings instantly. Developer
- Markdown to HTML Converter Convert Markdown text to clean HTML instantly in your browser. Developer
- Slug Generator Convert text to URL-friendly slugs for web pages and blog posts. Developer
- HTML Entity Encoder & Decoder Encode HTML entities or decode entity-encoded text instantly. Developer
- Token Counter Estimate token count for LLM prompts (GPT-4, Claude, Llama, Mistral). Developer
- Regex Tester Test regular expressions with live match highlighting and groups. Developer
- Cron Expression Generator Generate cron expressions for scheduled tasks with human-readable descriptions. Developer
- Meta Tag Generator Generate SEO meta tags, Open Graph, Twitter Cards, and JSON-LD schema. Developer
- Email Validator Check if an email address is valid and well-formed. Developer
- URL Parser Break a URL into protocol, host, path, query, and fragment. Developer
- JSON to CSV Converter Convert a JSON array of objects to CSV. Developer
- CSV to JSON Converter Convert CSV data to a JSON array of objects. Developer
- CSS Minifier Minify CSS by removing comments and whitespace. Developer
- JavaScript Minifier Minify JavaScript by removing comments and whitespace. Developer
- HTML Minifier Minify HTML by removing comments and whitespace. Developer
- SQL Formatter Format and beautify SQL queries with indentation. Developer
- ASCII Text Converter Convert text to ASCII codes and back. Developer
- Markdown Table Generator Convert CSV, tab, pipe, or whitespace data into a GitHub-flavored markdown table. Developer
- URL Decode Batch URL-encode or URL-decode a whole list of strings in one click. Developer
- JSON Minify Minify a JSON string — strip whitespace and compact it to one line. Developer
- Punycode Converter Convert internationalized domain names (IDN) to Punycode (xn--) and back. Developer
- JSONPath Extractor Extract values from any JSON document using a JSONPath query expression. Developer
- HTML Tag Extractor Extract every tag, attribute, class, and id from an HTML snippet. Developer
- Image to Base64 Encoder Encode an image file to a base64 data URI, or decode a data URI back to bytes. Developer
- Cron Next Run Calculator Show the next N run times for any 5-field cron expression from a start time. Developer
- JSON Prettify vs Minify Show the same JSON pretty and minified side by side with the character savings. Developer
- JSON to YAML Converter Convert JSON to YAML and YAML back to JSON instantly in your browser. Developer
- YAML Validator Validate YAML online and re-print it as clean canonical YAML. Developer
- Markdown to HTML Converter (Two-Way) Convert Markdown to HTML and HTML back to Markdown in your browser. Developer
- TOML to JSON Converter Convert TOML to JSON and JSON back to TOML instantly in your browser. Developer
- JSON Validator Validate JSON and pinpoint the exact line and column of any syntax error. Developer
- UUID Validator Validate a UUID, extract its version, variant, and get the canonical form. Developer
- Regex Explainer Parse a regular expression and explain each token in plain English. Developer
- HTTP Status Code Lookup Look up any HTTP status code by number or keyword and see what it means and when it happens. Developer
- Markdown Table Formatter Align and tidy existing markdown tables — equal-width columns, consistent separators, no broken rows. Developer
- Unix Permissions Calculator Convert chmod modes both ways: octal like 755 ↔ symbolic like rwxr-xr-x. Developer
- Semver Comparator Parse, compare and sort semantic versions with correct prerelease precedence rules. Developer
- Byte Size Formatter Format any byte count as a human-readable size in SI (KB = 1000) and binary IEC (KiB = 1024) at once. Developer
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