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Developer Tools
222 appsDeveloper Tools: Capture & Preview
20 appsWebsite · CreateAbove-the-Fold ScreenshotSave the first screen visitors see before they scroll.Website · CreateCSS-Free Website PreviewSee the page structure without its style sheets.Website · CreateCustom Viewport ScreenshotChoose an exact browser width and height for the screenshot.Website · CreateDark Mode Website ScreenshotAsk the page for its dark colour scheme and capture the result.Website · CreateForced Colours Website PreviewSee how the page looks with system forced colours.Website · CreateFull Page ScreenshotCapture the page from top to bottom, up to a safe height.Website · CreateHigh-DPI Website ScreenshotCapture a sharper two-times pixel density image.Website · CreateImage-Free Website PreviewSee whether the page still makes sense when images do not load.Website · CreateJavaScript-Off Website ScreenshotSee what the page shows when JavaScript is turned off.Website · CreateLight and Dark Screenshot ComparisonCapture the same page in light and dark colour schemes.Website · CreateLight Mode Website ScreenshotAsk the page for its light colour scheme and capture the result.Website · CreateMobile Landscape ScreenshotCapture a wide phone view for menus, games, and videos.Website · CreateMobile Website ScreenshotSee a public page in a 390 pixel phone view.Website · CreatePrint Layout ScreenshotPreview the page with print styles before making a PDF.Website · CreateReduced Motion Website PreviewSee the page with reduced motion turned on.Website · CreateResponsive Screenshot PackCapture desktop, tablet, and phone views in one run.Website · CreateTablet Website ScreenshotSee a public page in a roomy tablet view.Website · CreateWeb Page Quality SnapshotOpen a public page and get a clear screenshot with its main quality facts.Website · CreateWeb Page to PDFTurn a public web page into a clean PDF with backgrounds.Website · CreateWide Desktop ScreenshotCapture a 1600 pixel desktop view.
Developer Tools: Errors & Network
10 appsWebsite · CheckDownload Link InventoryFind links that look like file downloads without clicking them.Website · CheckFailed Web Request CheckerFind network failures and HTTP error responses seen while the page loads.Website · CheckJavaScript Console Error CheckerOpen the page and collect browser console errors and warnings.Website · CheckPage Performance Timing SnapshotShow browser navigation, paint, and content timing from one page load.Website · CheckThird-Party Host InventoryList outside hosts contacted while the page loads.Website · CheckWeb Font InventoryList font files requested and font families used on the page.Website · CheckWeb Page DOM Size CheckerCount page elements and show the deepest nesting found.Website · CheckWeb Page Network Request SummaryCount page requests by type and host.Website · CheckWeb Page Redirect Chain CheckerList each page URL followed before the final page opened.Website · CheckWeb Page Resource Weight EstimateEstimate transferred bytes reported by the browser for this page load.
Developer Tools: Accessibility & Quality
4 appsWebsite · CheckARIA Accessibility SnapshotCreate a text view of the page accessibility tree.Website · CheckBrowser Language Website PreviewOpen the page with a browser language such as French Canada.Website · CheckTime Zone Website PreviewOpen the page in another time zone and capture what it shows.Website · CheckWeb Page Scroll Size CheckerMeasure the full page width and height and flag sideways scrolling.
Developer Tools: Content & Structure
15 appsWebsite · CheckCanonical URL CheckerCheck whether the page names one clear canonical URL.Website · CheckFavicon and Icon InspectorFind favicons, touch icons, and web app icons named by the page.Website · CheckHeading Outline ExtractorList the H1 to H6 headings in page order.Website · CheckPage Language CheckerCheck the page language and direction settings.Website · CheckPage Title and Description CheckerCheck the page title and search description length.Website · CheckStructured Data ExtractorFind JSON-LD blocks and show their main schema types.Website · CheckWeb Page Control InventoryList buttons, inputs, selects, and text areas with their labels.Website · CheckWeb Page Form InventoryList forms, methods, actions, and control counts.Website · CheckWeb Page Image InventoryList images with alt text, size, and loading style.Website · CheckWeb Page Landmark InventoryCount headers, navigation, main areas, asides, and footers.Website · CheckWeb Page Link InventoryList page links and show which ones leave the website.Website · CheckWeb Page Metadata ExtractorCollect the title, description, language, canonical link, and viewport settings.Website · CheckWeb Page Table InventoryList each table with its caption, row count, and column count.Website · CheckWeb Page Text ExtractorPull out the visible words from a public page.Website · CheckWebsite Technology Hint ScannerFind public clues for common site builders and front-end tools.
Developer Tools: Format & Encode
3 appsBase64 · EncodeBase64 Encoder & DecoderEncode Unicode text or files to Base64, decode Base64 safely, and switch to URL-safe output when needed.JSON · FormatJSON Formatter & ValidatorFormat, minify, sort, repair, and inspect JSON with clear line-and-column errors and a searchable tree view.URL · EncodeURL Encoder & DecoderEncode 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 appsXML · FormatXML FormatterAdd clean spacing and line breaks to messy XML without sending it anywhere.XML · FormatXML MinifierMake a smaller XML copy by removing display-only spaces and line breaks.XML · ValidateXML ValidatorCheck tags, quotes, and closing marks, then get a short message that points to the problem.
Developer Tools: Convert & Clean
3 appsXML · ConvertJSON to XML ConverterTurn a JSON object into clean XML, including attributes marked with @_ and text marked with #text.XML · FormatXML Namespace CleanerRemove prefixes such as store: and meta: to make a simpler XML copy for basic tools.XML · ConvertXML to JSON ConverterConvert elements and attributes into JSON that is easy to read, copy, and use in code.
Developer Tools: Explore & Extract
5 appsXML · ExtractXML Attribute ExtractorPull attribute names and values into a CSV table with the path to each element.XML · ViewXML Element FinderSearch an XML file by element name or path and list each matching value and attribute.XML · ViewXML StatisticsSee element, attribute, text, depth, and repeated-name totals in one small report.XML · ExtractXML Text ExtractorList the text inside XML elements with a clear path showing where each line came from.XML · ViewXML Tree ViewerTurn 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 · GenerateCron Expression GeneratorBuild or explain a standard five-part cron schedule, validate each field, and preview the next run times in your timezone.Unix · ConvertUnix Timestamp ConverterConvert 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 · CompareCSS Diff CheckerCompare two CSS files by selector, property, value, punctuation, and spacing in one clear view.JSON · CompareJSON Diff CheckerCompare two JSON files by value, even when their keys are in a different order, and see every added or removed part.Patch · EditPatch ApplierApply a unified patch to one text file and preview the finished file before you save it.Patch · ViewPatch InspectorInspect a unified or Git patch and count its files, hunks, added lines, and removed lines without changing anything.Patch · GenerateUnified Patch MakerTurn the old and new version of a text file into a standard unified patch for Git and other tools.Text · CompareWord Diff CheckerCompare two paragraphs word by word and spot small edits that a line comparison can miss.
Developer Tools: Mock Data
16 appsJSON & CSV · GenerateCustom Fake Dataset GeneratorName your columns, pick simple fake field types, and create a repeatable JSON or CSV dataset.JSON & CSV · GenerateFake Address GeneratorCreate localized street addresses, cities, regions, postal codes, countries, and optional map coordinates.JSON & CSV · GenerateFake Appointment Dataset GeneratorCreate safe sample appointments with clients, services, staff, times, lengths, prices, and status.JSON & CSV · GenerateFake Book Metadata GeneratorCreate sample book titles, authors, genres, publishers, formats, series, ISBNs, and optional summaries.JSON & CSV · GenerateFake Company GeneratorCreate made-up company names, taglines, industries, websites, emails, and phone numbers.JSON & CSV · GenerateFake Contact List GeneratorBuild a sample contact list with names, emails, phone numbers, companies, and optional addresses.JSON & CSV · GenerateFake Food Menu GeneratorCreate sample dishes with descriptions, food styles, ingredients, spice notes, prices, and availability.JSON & CSV · GenerateFake Order GeneratorCreate nested test orders with customers, line items, quantities, totals, dates, and order status.JSON & CSV · GenerateFake Person GeneratorCreate realistic names, birthdays, jobs, and short bios for tests, demos, and practice projects.JSON & CSV · GenerateFake Product Catalog GeneratorCreate sample products with SKUs, names, departments, descriptions, materials, colours, and prices.JSON & CSV · GenerateFake Vehicle Dataset GeneratorCreate sample vehicles with makers, models, types, fuel, colours, and optional VIN and plate values.JSON & CSV · GenerateInternet Test Data GeneratorCreate sample usernames, emails, domains, URLs, IP addresses, user agents, and optional passwords.JSON & CSV · GenerateLocalized Fake Data SamplerCompare names, addresses, phone numbers, companies, and products from two language or country settings.JSON & CSV · GenerateMock API Response GeneratorCreate a realistic users, products, or orders API response with optional page details.SQL · GenerateSQL Seed Data GeneratorCreate safe INSERT statements for sample users, products, or companies in PostgreSQL, MySQL, or SQLite.JSON & CSV · GenerateTest Payment Data GeneratorCreate clearly fake card and bank fields for form tests. These values are not for real payments.
Developer Tools: Build Templates
7 appsLiquid · GenerateCustomer Greeting Liquid Template TesterPreview a greeting with names, customer tags, and a safe fallback.Liquid · GenerateInvoice Line Liquid Template TesterLoop through invoice items and show quantity, price, and a simple line total.Liquid · GenerateJSON to Liquid RendererPaste any JSON object and render its fields through a bounded Liquid template.Liquid · GenerateLiquid Batch Preview MakerPreview the same Liquid template for up to fifty records in a JSON customers array.Liquid · GenerateLiquid Template PlaygroundRender a safe, bounded Liquid template and see the output as plain text.Liquid · GenerateOrder Confirmation Liquid Template TesterBuild a clear order confirmation from customer, order, and shop fields.Liquid · GenerateShopify Product Card Template TesterTest product fields, price math, tags, and availability in a Liquid card template.
Developer Tools: Common Formats
12 appsRegular Expression · GenerateCoupon Code Regex Sample GeneratorGenerate sample coupon codes from a simple editable promotion pattern.Regular Expression · GenerateDate Regex Sample GeneratorGenerate ISO-shaped date strings for parser and form tests, then check real calendar rules separately.Regular Expression · GenerateEmail Regex Sample GeneratorGenerate example email addresses on reserved example and test domains.Regular Expression · GenerateFilename Regex Sample GeneratorGenerate lowercase file names with common test extensions and no folder paths.Regular Expression · GenerateHex Color Regex Sample GeneratorGenerate uppercase six-digit hexadecimal colors for design and form tests.Regular Expression · GenerateIPv4 Regex Sample GeneratorGenerate IPv4 values whose four number parts stay between 0 and 255.Regular Expression · GenerateOrder Number Regex Sample GeneratorGenerate order-number examples for receipt, search, and import testing.Regular Expression · GeneratePhone Regex Sample GeneratorGenerate North American phone-shaped examples for formatting and input tests.Regular Expression · GenerateSKU Regex Sample GeneratorGenerate product SKU examples with letters, digits, and fixed separators.Regular Expression · GenerateTracking Code Regex Sample GeneratorGenerate fake tracking-shaped codes without using a real carrier number.Regular Expression · GenerateURL Slug Regex Sample GeneratorGenerate lowercase, hyphen-separated slug values for route and form testing.Regular Expression · GenerateUsername Regex Sample GeneratorGenerate lowercase usernames that follow a clear length and character rule.
Developer Tools: Explore a Pattern
4 appsRegular Expression · AnalyzeLong Regex Sample FinderGenerate many matches and keep the longest examples found in that sample run.Regular Expression · AnalyzeRegex Coverage Pack MakerMake a small test pack that covers several lengths and removes duplicate strings.Regular Expression · AnalyzeRegex Sample Length ExplorerGenerate a test batch and compare its shortest, longest, and average string lengths.Regular Expression · AnalyzeShort Regex Sample FinderGenerate many matches and keep the shortest examples found in that sample run.
Developer Tools: Filter & Reshape
7 appsJSON · ConvertJSON Array FilterFilter a JSON array with a clear JSONata condition and keep the matching objects.JSON · ConvertJSON Array FlattenerPull values from arrays inside records into one simple result sequence.JSON · ConvertJSON Array GrouperGroup array records by a field and return one object with a key for each group.JSON · ConvertJSON Array SorterSort an array by text or numbers with JSONata's order-by operator.JSON · ConvertJSON Field PickerTurn each object into a smaller object with a chosen set of fields.JSON · ConvertJSON Field RenamerBuild new objects with renamed fields while keeping the original JSON unchanged.JSON · ConvertJSON Object ReshaperCombine fields, filters, and nested results into a cleaner object for another system.
Developer Tools: Find Code Parts
16 appsJavaScript · ExtractJavaScript Arrow Function FinderList arrow functions with inferred names, parameters, async state, and source lines.JavaScript · ExtractJavaScript Async Function FinderFind async declarations, expressions, and arrows with names, parameters, and lines.JavaScript · ExtractJavaScript Await Expression FinderList awaited expressions with their readable source text and exact line.JavaScript · ExtractJavaScript Call Expression FinderList function and method calls with readable callee names, argument counts, and lines.JavaScript · ExtractJavaScript Class InventoryList class declarations and expressions with inheritance and method counts.JavaScript · ExtractJavaScript Comment ExtractorExtract comments with their type, text, line, and character count.JavaScript · ExtractJavaScript Dynamic Import FinderList dynamic import expressions, source values, and exact locations.JavaScript · ExtractJavaScript Event Listener FinderList event listener calls, target expressions, event names, and lines.JavaScript · ExtractJavaScript Export InventoryFind export statements, names, source modules, lines, and export kinds.JavaScript · ExtractJavaScript Function InventoryFind function declarations and expressions with names, parameters, lines, and flags.JavaScript · ExtractJavaScript Import InventoryFind static imports, source packages, local names, and import kinds.JavaScript · ExtractJavaScript Number Literal ExtractorExtract decimal, hex, binary, octal, bigint, and exponent number literals.JavaScript · ExtractJavaScript Object Key FinderFind object property keys, method keys, computed state, and source lines.JavaScript · ExtractJavaScript Optional Chaining FinderList optional member and call expressions with their source lines.JavaScript · ExtractJavaScript String Literal ExtractorExtract string and template text with quote type, length, and source line.JavaScript · ExtractJavaScript Variable Declaration FinderFind declared names, declaration kinds, initial values, lines, and nesting depth.
Developer Tools: Generate Samples
4 appsRegular Expression · GenerateBulk Regex Sample GeneratorGenerate up to 250 matching strings for forms, imports, and test fixtures.Regular Expression · GenerateRegex Example GeneratorEnter a regular expression and make clear example strings that match it.Regular Expression · GenerateSeeded Regex Sample GeneratorUse a seed so the same pattern and settings make the same strings again.Regular Expression · GenerateUnique Regex Sample GeneratorTry extra generations and keep only distinct strings that match your pattern.
Developer Tools: Inspect & Validate
5 appsLiquid · CheckLiquid Filter InventoryFind Liquid filter names, counts, and source lines without rendering the output.Liquid · CheckLiquid Output Escaping CheckerList output expressions and confirm that Bookify's preview applies default HTML escaping.Liquid · CheckLiquid Syntax CheckerParse a Liquid template with strict filters and show a clear local syntax result.Liquid · CheckLiquid Tag InventoryList if, for, assign, capture, case, and other Liquid tags with line numbers.Liquid · CheckLiquid Variable FinderFind root variables and full nested paths without rendering the template.
Developer Tools: JSON Web Keys
7 appsJWT · GenerateJWK Key Pair GeneratorGenerate an RS256 or ES256 JWK pair and a stable key ID in your browser.JWT · CheckJWK Thumbprint CalculatorCalculate the RFC 7638 SHA-256 thumbprint and thumbprint URI for a JWK.JWT · ConvertJWK to PEM ConverterConvert an RSA or EC JWK into a public SPKI or private PKCS8 PEM key.JWT · CheckJWKS InspectorList key IDs, algorithms, uses, public fields, and thumbprints in a JWKS file.JWT · ExtractJWKS Key FinderSearch a pasted JWKS for a matching kid and copy the exact public key.JWT · ConvertPEM to JWK ConverterConvert a public SPKI or private PKCS8 RSA or EC key into JWK format.JWT · GenerateSymmetric JWK GeneratorGenerate a 256-bit secret JWK for HS256 signing or A256GCM encryption.
Developer Tools: JWS & JWE
4 appsJWT · CheckJWE Text DecryptorDecrypt a direct A256GCM compact JWE with the passphrase used to make it.JWT · GenerateJWE Text EncryptorProtect text with direct A256GCM encryption and a passphrase-derived local key.JWT · GenerateJWS Message SignerCreate a compact JWS for a text message with a shared secret kept in this tab.JWT · CheckJWS Signature VerifierCheck an HS256 compact JWS and reveal its text only after the signature matches.
Developer Tools: JWT Signing & Checks
5 appsJWT · CheckJWT Claims ValidatorVerify an HS256 token and require the issuer and audience your app expects.JWT · GenerateJWT HS256 SignerTurn JSON claims into a signed HS256 token with a secret that stays in this tab.JWT · GenerateJWT Private Key SignerCreate an RS256 or ES256 token from claims and a local JWK or PKCS8 private key.JWT · CheckJWT Public Key VerifierVerify an RS256 or ES256 token with a local public JWK or SPKI key.JWT · CheckJWT Signature VerifierCheck whether a JWT matches a shared secret, then read the verified claims.
Developer Tools: Numbers & Reports
7 appsJSON · CalculateJSON Average CalculatorCalculate the simple average of numbers collected from JSON records.JSON · AnalyzeJSON Boolean Rule CheckerEvaluate a JSONata condition and return one clear true or false result.JSON · AnalyzeJSON Data Summary MakerCombine counts, totals, averages, and distinct values into one result object.JSON · AnalyzeJSON Key InventoryUse $keys to list top-level keys and the shared keys found in array records.JSON · CalculateJSON Min and Max FinderReturn the minimum and maximum values from one numeric JSON field.JSON · CalculateJSON Total CalculatorSum numbers from a JSON array without moving the data into a spreadsheet.JSON · AnalyzeJSON Value Type InspectorUse $type to report the JSON type at several useful paths.
Developer Tools: Parse & Understand
5 appsJavaScript · AnalyzeJavaScript AST ExplorerParse JavaScript into a clear table of syntax nodes and a downloadable AST.JavaScript · AnalyzeJavaScript AST JSON ExporterParse JavaScript with locations and export its capped Acorn AST as JSON.JavaScript · AnalyzeJavaScript Syntax CheckerFind the first JavaScript syntax error with its line, column, and nearby code.JavaScript · AnalyzeJavaScript Syntax Error ExplainerShow the broken line, exact caret, parser message, and a short fix hint.JavaScript · AnalyzeJavaScript Top-Level Statement OutlineList top-level imports, exports, declarations, classes, and other statements in order.
Developer Tools: Password Planning
7 appsPassword-free JSON · CheckMaster Password Strength CheckerCheck a password-manager master password with a high score and long-length target.Password-free JSON · ComparePassword Comparison ToolSee which of two password ideas has the higher score and guess estimate.Password-free JSON · CheckPassword Feedback ExplainerGet short, simple feedback about what weakens a password and what to change.Password-free JSON · ComparePassword Improvement LabAdd a private change and see whether it truly raises the guess score.Password-free JSON · CheckPassword Safety Report MakerCreate a shareable score, pattern, and advice report with no password text inside it.Password-free JSON · CheckWi-Fi Password Strength CheckerReview a Wi-Fi password with a strong length target and offline attack estimate.Password-free JSON · CheckWork Password Policy CheckerTest length, character rules, and zxcvbn strength in one clear work-policy report.
Developer Tools: Pattern Checks
7 appsPassword-free JSON · CheckDate Pattern Password CheckerSpot date patterns and recent years that can make a password easier to guess.Password-free JSON · CheckDictionary Password CheckerFind dictionary words, common names, and familiar passwords inside one choice.Password-free JSON · CheckKeyboard Pattern Password CheckerDetect common keyboard walks that look complex but are quick to guess.Password-free JSON · CheckPassword Pattern FinderSpot dictionary words, repeats, dates, sequences, and keyboard paths in a password.Password-free JSON · CheckPersonal Info Password Risk CheckerAdd names or words an attacker may know and see whether they weaken the password.Password-free JSON · CheckPIN Strength CheckerCheck a 4 to 12 digit PIN for repeats, sequences, dates, and guess difficulty.Password-free JSON · CheckRepeated Password Pattern CheckerShow 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 · AnalyzeJSON Duplicate Value FinderFind repeated field values in a JSON array and list each duplicate one time.JSON · AnalyzeJSON Path Value FinderUse JSONata path steps to collect nested values without writing a loop.JSON · AnalyzeJSON Record LookupLook up matching records in a JSON array with one simple equality test.JSON · AnalyzeJSON Text Search FilterSearch a text field without case sensitivity and return each matching object.JSON · AnalyzeJSON Unique Value FinderCollect a field from many records and remove repeated values with JSONata.JSON · AnalyzeJSONata Query PlaygroundRun a safe, capped JSONata expression against JSON and inspect the structured result.
Developer Tools: Review Code
5 appsJavaScript · AnalyzeJavaScript Complexity SnapshotShow functions, branches, loops, catches, logical choices, and deepest syntax nesting.JavaScript · AnalyzeJavaScript Conditional InventoryFind if, switch, conditional, and logical expressions with source lines.JavaScript · AnalyzeJavaScript Console Call FinderList console method calls and their source lines before code is shipped.JavaScript · AnalyzeJavaScript Identifier FrequencyCount identifier names and show their frequency, first line, and example role.JavaScript · AnalyzeJavaScript Loop InventoryFind for, for-of, for-in, while, and do-while loops with lines and nesting.
Developer Tools: Strength & Time
6 appsPassword-free JSON · CheckBatch Password Strength CheckerCheck a small list of test passwords and export scores without exporting the passwords.Password-free JSON · CheckPassphrase Strength CheckerMeasure a passphrase by its words, guess score, and estimated attack time.Password-free JSON · CheckPassword Crack Time EstimatorCompare online and offline crack-time estimates without sending the password away.Password-free JSON · CheckPassword Guess Count EstimatorEstimate the number of guesses and log-scale difficulty for one password.Password-free JSON · CheckPassword Length Strength CheckerCompare password length with its real pattern-based score and safe length bands.Password-free JSON · CheckPassword Strength CheckerGet an honest 0 to 4 score, safe advice, and a local crack-time estimate.
Developer Tools: Test Liquid Features
14 appsLiquid · TestLiquid Array Filter TesterTest common Liquid array filters against tags or other JSON lists.Liquid · TestLiquid Assign and Capture TesterTest assign math and capture blocks before placing them in a larger template.Liquid · TestLiquid Case Statement TesterTest case, when, and else branches against a JSON status or label.Liquid · TestLiquid Conditional TesterChange JSON values and see which Liquid conditional branch renders.Liquid · TestLiquid Cycle Tag TesterPreview repeating labels or row styles made with Liquid's cycle tag.Liquid · TestLiquid Date Format TesterTest Liquid's date filter with a fixed sample time and clear format codes.Liquid · TestLiquid Default Value TesterTest the default filter with present, blank, and missing JSON fields.Liquid · TestLiquid Filter Chain TesterTest the order and result of a Liquid filter chain on real sample data.Liquid · TestLiquid For Loop TesterTest for-loop indexes, first and last flags, limits, and array values.Liquid · TestLiquid Money Format TesterTest division, rounding, and currency text for price values stored as cents.Liquid · TestLiquid String Filter TesterTest capitalization, trimming, replacement, truncation, and other string filters.Liquid · TestLiquid Unless Tag TesterTest Liquid's unless tag with stock, status, or customer data.Liquid · TestLiquid URL Handle Template TesterTest lowercase, replacement, and cleanup filters for a basic URL handle.Liquid · TestLiquid Whitespace Control TesterCompare normal Liquid delimiters with dash-trimmed tags and output marks.