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Developer Tools
222 appsDeveloper Tools: Capture & Preview
20 appsAbove-the-Fold Screenshot
Save the first screen visitors see before they scroll.
CSS-Free Website Preview
See the page structure without its style sheets.
Custom Viewport Screenshot
Choose an exact browser width and height for the screenshot.
Dark Mode Website Screenshot
Ask the page for its dark colour scheme and capture the result.
Forced Colours Website Preview
See how the page looks with system forced colours.
Full Page Screenshot
Capture the page from top to bottom, up to a safe height.
High-DPI Website Screenshot
Capture a sharper two-times pixel density image.
Image-Free Website Preview
See whether the page still makes sense when images do not load.
JavaScript-Off Website Screenshot
See what the page shows when JavaScript is turned off.
Light and Dark Screenshot Comparison
Capture the same page in light and dark colour schemes.
Light Mode Website Screenshot
Ask the page for its light colour scheme and capture the result.
Mobile Landscape Screenshot
Capture a wide phone view for menus, games, and videos.
Mobile Website Screenshot
See a public page in a 390 pixel phone view.
Print Layout Screenshot
Preview the page with print styles before making a PDF.
Reduced Motion Website Preview
See the page with reduced motion turned on.
Responsive Screenshot Pack
Capture desktop, tablet, and phone views in one run.
Tablet Website Screenshot
See a public page in a roomy tablet view.
Web Page Quality Snapshot
Open a public page and get a clear screenshot with its main quality facts.
Web Page to PDF
Turn a public web page into a clean PDF with backgrounds.
Wide Desktop Screenshot
Capture a 1600 pixel desktop view.
Developer Tools: Errors & Network
10 appsDownload Link Inventory
Find links that look like file downloads without clicking them.
Failed Web Request Checker
Find network failures and HTTP error responses seen while the page loads.
JavaScript Console Error Checker
Open the page and collect browser console errors and warnings.
Page Performance Timing Snapshot
Show browser navigation, paint, and content timing from one page load.
Third-Party Host Inventory
List outside hosts contacted while the page loads.
Web Font Inventory
List font files requested and font families used on the page.
Web Page DOM Size Checker
Count page elements and show the deepest nesting found.
Web Page Network Request Summary
Count page requests by type and host.
Web Page Redirect Chain Checker
List each page URL followed before the final page opened.
Web Page Resource Weight Estimate
Estimate transferred bytes reported by the browser for this page load.
Developer Tools: Accessibility & Quality
4 appsARIA Accessibility Snapshot
Create a text view of the page accessibility tree.
Browser Language Website Preview
Open the page with a browser language such as French Canada.
Time Zone Website Preview
Open the page in another time zone and capture what it shows.
Web Page Scroll Size Checker
Measure the full page width and height and flag sideways scrolling.
Developer Tools: Content & Structure
15 appsCanonical URL Checker
Check whether the page names one clear canonical URL.
Favicon and Icon Inspector
Find favicons, touch icons, and web app icons named by the page.
Heading Outline Extractor
List the H1 to H6 headings in page order.
Page Language Checker
Check the page language and direction settings.
Page Title and Description Checker
Check the page title and search description length.
Structured Data Extractor
Find JSON-LD blocks and show their main schema types.
Web Page Control Inventory
List buttons, inputs, selects, and text areas with their labels.
Web Page Form Inventory
List forms, methods, actions, and control counts.
Web Page Image Inventory
List images with alt text, size, and loading style.
Web Page Landmark Inventory
Count headers, navigation, main areas, asides, and footers.
Web Page Link Inventory
List page links and show which ones leave the website.
Web Page Metadata Extractor
Collect the title, description, language, canonical link, and viewport settings.
Web Page Table Inventory
List each table with its caption, row count, and column count.
Web Page Text Extractor
Pull out the visible words from a public page.
Website Technology Hint Scanner
Find public clues for common site builders and front-end tools.
Developer Tools: Format & Encode
3 appsBase64 Encoder & Decoder
Encode Unicode text or files to Base64, decode Base64 safely, and switch to URL-safe output when needed.
JSON Formatter & Validator
Format, minify, sort, repair, and inspect JSON with clear line-and-column errors and a searchable tree view.
URL Encoder & Decoder
Encode or decode a full URL, one query value, or form data, then inspect every query parameter in a readable table.
Developer Tools: Format & Validate
3 appsDeveloper Tools: Convert & Clean
3 appsJSON to XML Converter
Turn a JSON object into clean XML, including attributes marked with @_ and text marked with #text.
XML Namespace Cleaner
Remove prefixes such as store: and meta: to make a simpler XML copy for basic tools.
XML to JSON Converter
Convert elements and attributes into JSON that is easy to read, copy, and use in code.
Developer Tools: Explore & Extract
5 appsXML Attribute Extractor
Pull attribute names and values into a CSV table with the path to each element.
XML Element Finder
Search an XML file by element name or path and list each matching value and attribute.
XML Statistics
See element, attribute, text, depth, and repeated-name totals in one small report.
XML Text Extractor
List the text inside XML elements with a clear path showing where each line came from.
XML Tree Viewer
Turn nested XML into a simple indented outline with element names, attributes, and short text.
Developer Tools: IDs & Tokens
2 appsDeveloper Tools: Time & Automation
2 appsCron Expression Generator
Build or explain a standard five-part cron schedule, validate each field, and preview the next run times in your timezone.
Unix Timestamp Converter
Convert Unix seconds, milliseconds, microseconds, or nanoseconds to readable dates and turn any local date back into a timestamp.
Developer Tools: Test & Compare
2 appsDeveloper Tools: Diff & Patch
6 appsCSS Diff Checker
Compare two CSS files by selector, property, value, punctuation, and spacing in one clear view.
JSON Diff Checker
Compare two JSON files by value, even when their keys are in a different order, and see every added or removed part.
Patch Applier
Apply a unified patch to one text file and preview the finished file before you save it.
Patch Inspector
Inspect a unified or Git patch and count its files, hunks, added lines, and removed lines without changing anything.
Unified Patch Maker
Turn the old and new version of a text file into a standard unified patch for Git and other tools.
Word Diff Checker
Compare two paragraphs word by word and spot small edits that a line comparison can miss.
Developer Tools: Mock Data
16 appsCustom Fake Dataset Generator
Name your columns, pick simple fake field types, and create a repeatable JSON or CSV dataset.
Fake Address Generator
Create localized street addresses, cities, regions, postal codes, countries, and optional map coordinates.
Fake Appointment Dataset Generator
Create safe sample appointments with clients, services, staff, times, lengths, prices, and status.
Fake Book Metadata Generator
Create sample book titles, authors, genres, publishers, formats, series, ISBNs, and optional summaries.
Fake Company Generator
Create made-up company names, taglines, industries, websites, emails, and phone numbers.
Fake Contact List Generator
Build a sample contact list with names, emails, phone numbers, companies, and optional addresses.
Fake Food Menu Generator
Create sample dishes with descriptions, food styles, ingredients, spice notes, prices, and availability.
Fake Order Generator
Create nested test orders with customers, line items, quantities, totals, dates, and order status.
Fake Person Generator
Create realistic names, birthdays, jobs, and short bios for tests, demos, and practice projects.
Fake Product Catalog Generator
Create sample products with SKUs, names, departments, descriptions, materials, colours, and prices.
Fake Vehicle Dataset Generator
Create sample vehicles with makers, models, types, fuel, colours, and optional VIN and plate values.
Internet Test Data Generator
Create sample usernames, emails, domains, URLs, IP addresses, user agents, and optional passwords.
Localized Fake Data Sampler
Compare names, addresses, phone numbers, companies, and products from two language or country settings.
Mock API Response Generator
Create a realistic users, products, or orders API response with optional page details.
SQL Seed Data Generator
Create safe INSERT statements for sample users, products, or companies in PostgreSQL, MySQL, or SQLite.
Test Payment Data Generator
Create clearly fake card and bank fields for form tests. These values are not for real payments.
Developer Tools: Build Templates
7 appsCustomer Greeting Liquid Template Tester
Preview a greeting with names, customer tags, and a safe fallback.
Invoice Line Liquid Template Tester
Loop through invoice items and show quantity, price, and a simple line total.
JSON to Liquid Renderer
Paste any JSON object and render its fields through a bounded Liquid template.
Liquid Batch Preview Maker
Preview the same Liquid template for up to fifty records in a JSON customers array.
Liquid Template Playground
Render a safe, bounded Liquid template and see the output as plain text.
Order Confirmation Liquid Template Tester
Build a clear order confirmation from customer, order, and shop fields.
Shopify Product Card Template Tester
Test product fields, price math, tags, and availability in a Liquid card template.
Developer Tools: Common Formats
12 appsCoupon Code Regex Sample Generator
Generate sample coupon codes from a simple editable promotion pattern.
Date Regex Sample Generator
Generate ISO-shaped date strings for parser and form tests, then check real calendar rules separately.
Email Regex Sample Generator
Generate example email addresses on reserved example and test domains.
Filename Regex Sample Generator
Generate lowercase file names with common test extensions and no folder paths.
Hex Color Regex Sample Generator
Generate uppercase six-digit hexadecimal colors for design and form tests.
IPv4 Regex Sample Generator
Generate IPv4 values whose four number parts stay between 0 and 255.
Order Number Regex Sample Generator
Generate order-number examples for receipt, search, and import testing.
Phone Regex Sample Generator
Generate North American phone-shaped examples for formatting and input tests.
SKU Regex Sample Generator
Generate product SKU examples with letters, digits, and fixed separators.
Tracking Code Regex Sample Generator
Generate fake tracking-shaped codes without using a real carrier number.
URL Slug Regex Sample Generator
Generate lowercase, hyphen-separated slug values for route and form testing.
Username Regex Sample Generator
Generate lowercase usernames that follow a clear length and character rule.
Developer Tools: Explore a Pattern
4 appsLong Regex Sample Finder
Generate many matches and keep the longest examples found in that sample run.
Regex Coverage Pack Maker
Make a small test pack that covers several lengths and removes duplicate strings.
Regex Sample Length Explorer
Generate a test batch and compare its shortest, longest, and average string lengths.
Short Regex Sample Finder
Generate many matches and keep the shortest examples found in that sample run.
Developer Tools: Filter & Reshape
7 appsJSON Array Filter
Filter a JSON array with a clear JSONata condition and keep the matching objects.
JSON Array Flattener
Pull values from arrays inside records into one simple result sequence.
JSON Array Grouper
Group array records by a field and return one object with a key for each group.
JSON Array Sorter
Sort an array by text or numbers with JSONata's order-by operator.
JSON Field Picker
Turn each object into a smaller object with a chosen set of fields.
JSON Field Renamer
Build new objects with renamed fields while keeping the original JSON unchanged.
JSON Object Reshaper
Combine fields, filters, and nested results into a cleaner object for another system.
Developer Tools: Find Code Parts
16 appsJavaScript Arrow Function Finder
List arrow functions with inferred names, parameters, async state, and source lines.
JavaScript Async Function Finder
Find async declarations, expressions, and arrows with names, parameters, and lines.
JavaScript Await Expression Finder
List awaited expressions with their readable source text and exact line.
JavaScript Call Expression Finder
List function and method calls with readable callee names, argument counts, and lines.
JavaScript Class Inventory
List class declarations and expressions with inheritance and method counts.
JavaScript Comment Extractor
Extract comments with their type, text, line, and character count.
JavaScript Dynamic Import Finder
List dynamic import expressions, source values, and exact locations.
JavaScript Event Listener Finder
List event listener calls, target expressions, event names, and lines.
JavaScript Export Inventory
Find export statements, names, source modules, lines, and export kinds.
JavaScript Function Inventory
Find function declarations and expressions with names, parameters, lines, and flags.
JavaScript Import Inventory
Find static imports, source packages, local names, and import kinds.
JavaScript Number Literal Extractor
Extract decimal, hex, binary, octal, bigint, and exponent number literals.
JavaScript Object Key Finder
Find object property keys, method keys, computed state, and source lines.
JavaScript Optional Chaining Finder
List optional member and call expressions with their source lines.
JavaScript String Literal Extractor
Extract string and template text with quote type, length, and source line.
JavaScript Variable Declaration Finder
Find declared names, declaration kinds, initial values, lines, and nesting depth.
Developer Tools: Generate Samples
4 appsBulk Regex Sample Generator
Generate up to 250 matching strings for forms, imports, and test fixtures.
Regex Example Generator
Enter a regular expression and make clear example strings that match it.
Seeded Regex Sample Generator
Use a seed so the same pattern and settings make the same strings again.
Unique Regex Sample Generator
Try extra generations and keep only distinct strings that match your pattern.
Developer Tools: Inspect & Validate
5 appsLiquid Filter Inventory
Find Liquid filter names, counts, and source lines without rendering the output.
Liquid Output Escaping Checker
List output expressions and confirm that Bookify's preview applies default HTML escaping.
Liquid Syntax Checker
Parse a Liquid template with strict filters and show a clear local syntax result.
Liquid Tag Inventory
List if, for, assign, capture, case, and other Liquid tags with line numbers.
Liquid Variable Finder
Find root variables and full nested paths without rendering the template.
Developer Tools: JSON Web Keys
7 appsJWK Key Pair Generator
Generate an RS256 or ES256 JWK pair and a stable key ID in your browser.
JWK Thumbprint Calculator
Calculate the RFC 7638 SHA-256 thumbprint and thumbprint URI for a JWK.
JWK to PEM Converter
Convert an RSA or EC JWK into a public SPKI or private PKCS8 PEM key.
JWKS Inspector
List key IDs, algorithms, uses, public fields, and thumbprints in a JWKS file.
JWKS Key Finder
Search a pasted JWKS for a matching kid and copy the exact public key.
PEM to JWK Converter
Convert a public SPKI or private PKCS8 RSA or EC key into JWK format.
Symmetric JWK Generator
Generate a 256-bit secret JWK for HS256 signing or A256GCM encryption.
Developer Tools: JWS & JWE
4 appsJWE Text Decryptor
Decrypt a direct A256GCM compact JWE with the passphrase used to make it.
JWE Text Encryptor
Protect text with direct A256GCM encryption and a passphrase-derived local key.
JWS Message Signer
Create a compact JWS for a text message with a shared secret kept in this tab.
JWS Signature Verifier
Check an HS256 compact JWS and reveal its text only after the signature matches.
Developer Tools: JWT Signing & Checks
5 appsJWT Claims Validator
Verify an HS256 token and require the issuer and audience your app expects.
JWT HS256 Signer
Turn JSON claims into a signed HS256 token with a secret that stays in this tab.
JWT Private Key Signer
Create an RS256 or ES256 token from claims and a local JWK or PKCS8 private key.
JWT Public Key Verifier
Verify an RS256 or ES256 token with a local public JWK or SPKI key.
JWT Signature Verifier
Check whether a JWT matches a shared secret, then read the verified claims.
Developer Tools: Numbers & Reports
7 appsJSON Average Calculator
Calculate the simple average of numbers collected from JSON records.
JSON Boolean Rule Checker
Evaluate a JSONata condition and return one clear true or false result.
JSON Data Summary Maker
Combine counts, totals, averages, and distinct values into one result object.
JSON Key Inventory
Use $keys to list top-level keys and the shared keys found in array records.
JSON Min and Max Finder
Return the minimum and maximum values from one numeric JSON field.
JSON Total Calculator
Sum numbers from a JSON array without moving the data into a spreadsheet.
JSON Value Type Inspector
Use $type to report the JSON type at several useful paths.
Developer Tools: Parse & Understand
5 appsJavaScript AST Explorer
Parse JavaScript into a clear table of syntax nodes and a downloadable AST.
JavaScript AST JSON Exporter
Parse JavaScript with locations and export its capped Acorn AST as JSON.
JavaScript Syntax Checker
Find the first JavaScript syntax error with its line, column, and nearby code.
JavaScript Syntax Error Explainer
Show the broken line, exact caret, parser message, and a short fix hint.
JavaScript Top-Level Statement Outline
List top-level imports, exports, declarations, classes, and other statements in order.
Developer Tools: Password Planning
7 appsMaster Password Strength Checker
Check a password-manager master password with a high score and long-length target.
Password Comparison Tool
See which of two password ideas has the higher score and guess estimate.
Password Feedback Explainer
Get short, simple feedback about what weakens a password and what to change.
Password Improvement Lab
Add a private change and see whether it truly raises the guess score.
Password Safety Report Maker
Create a shareable score, pattern, and advice report with no password text inside it.
Wi-Fi Password Strength Checker
Review a Wi-Fi password with a strong length target and offline attack estimate.
Work Password Policy Checker
Test length, character rules, and zxcvbn strength in one clear work-policy report.
Developer Tools: Pattern Checks
7 appsDate Pattern Password Checker
Spot date patterns and recent years that can make a password easier to guess.
Dictionary Password Checker
Find dictionary words, common names, and familiar passwords inside one choice.
Keyboard Pattern Password Checker
Detect common keyboard walks that look complex but are quick to guess.
Password Pattern Finder
Spot dictionary words, repeats, dates, sequences, and keyboard paths in a password.
Personal Info Password Risk Checker
Add names or words an attacker may know and see whether they weaken the password.
PIN Strength Checker
Check a 4 to 12 digit PIN for repeats, sequences, dates, and guess difficulty.
Repeated Password Pattern Checker
Show repeats that make a password easier to predict, such as aaa or wordword.
Developer Tools: Preview & Convert
1 appDeveloper Tools: Quality Checks
2 appsDeveloper Tools: Query & Find
6 appsJSON Duplicate Value Finder
Find repeated field values in a JSON array and list each duplicate one time.
JSON Path Value Finder
Use JSONata path steps to collect nested values without writing a loop.
JSON Record Lookup
Look up matching records in a JSON array with one simple equality test.
JSON Text Search Filter
Search a text field without case sensitivity and return each matching object.
JSON Unique Value Finder
Collect a field from many records and remove repeated values with JSONata.
JSONata Query Playground
Run a safe, capped JSONata expression against JSON and inspect the structured result.
Developer Tools: Review Code
5 appsJavaScript Complexity Snapshot
Show functions, branches, loops, catches, logical choices, and deepest syntax nesting.
JavaScript Conditional Inventory
Find if, switch, conditional, and logical expressions with source lines.
JavaScript Console Call Finder
List console method calls and their source lines before code is shipped.
JavaScript Identifier Frequency
Count identifier names and show their frequency, first line, and example role.
JavaScript Loop Inventory
Find for, for-of, for-in, while, and do-while loops with lines and nesting.
Developer Tools: Strength & Time
6 appsBatch Password Strength Checker
Check a small list of test passwords and export scores without exporting the passwords.
Passphrase Strength Checker
Measure a passphrase by its words, guess score, and estimated attack time.
Password Crack Time Estimator
Compare online and offline crack-time estimates without sending the password away.
Password Guess Count Estimator
Estimate the number of guesses and log-scale difficulty for one password.
Password Length Strength Checker
Compare password length with its real pattern-based score and safe length bands.
Password Strength Checker
Get an honest 0 to 4 score, safe advice, and a local crack-time estimate.
Developer Tools: Test Liquid Features
14 appsLiquid Array Filter Tester
Test common Liquid array filters against tags or other JSON lists.
Liquid Assign and Capture Tester
Test assign math and capture blocks before placing them in a larger template.
Liquid Case Statement Tester
Test case, when, and else branches against a JSON status or label.
Liquid Conditional Tester
Change JSON values and see which Liquid conditional branch renders.
Liquid Cycle Tag Tester
Preview repeating labels or row styles made with Liquid's cycle tag.
Liquid Date Format Tester
Test Liquid's date filter with a fixed sample time and clear format codes.
Liquid Default Value Tester
Test the default filter with present, blank, and missing JSON fields.
Liquid Filter Chain Tester
Test the order and result of a Liquid filter chain on real sample data.
Liquid For Loop Tester
Test for-loop indexes, first and last flags, limits, and array values.
Liquid Money Format Tester
Test division, rounding, and currency text for price values stored as cents.
Liquid String Filter Tester
Test capitalization, trimming, replacement, truncation, and other string filters.
Liquid Unless Tag Tester
Test Liquid's unless tag with stock, status, or customer data.
Liquid URL Handle Template Tester
Test lowercase, replacement, and cleanup filters for a basic URL handle.
Liquid Whitespace Control Tester
Compare normal Liquid delimiters with dash-trimmed tags and output marks.