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Data Tools
171 tools in this collection. Choose a task below or search the complete FeuTex toolkit.
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API Pagination Response Inspector
Find repeated record IDs across supplied API response pages and count distinct records.
Open tool →DeveloperArbitrary-Precision Base Converter
Convert signed integers between bases 2 through 36 without floating-point loss.
Open tool →DataAvro Formatter and Basic Structure Checker
Format and minify Avro schemas with optional key sorting and basic validation. Paste your schema JSON, pretty-print for readability, or minify for storage. Runs fully offline in your browser.
Open tool →DeveloperBash Regex Snippet Builder with JavaScript Preview
JS match/replace preview Bash/grep snippets shell quoting ERE incompatibility warnings
Open tool →FilesBatch File Renamer ZIP
Download numbered copies of selected files in one ZIP, with a CSV mapping original and new names.
Open tool →DeveloperBinary Search Comparison Bound
Estimate worst-case comparisons and compare with a linear lookup bound.
Open tool →DeveloperBitset Versus ID List Memory
Compare a dense membership bitset with an unsorted fixed-width identifier list.
Open tool →DeveloperBranch Misprediction Cost
Estimate added cycles per instruction from branch frequency and misprediction penalty.
Open tool →DeveloperBroken JSON Repair
Broken JSON Repair with local processing, explicit controls and downloadable results.
Open tool →DeveloperC# Regex Literal Builder with JavaScript Preview
C# string unescape C# code literals JS regex preview
Open tool →DeveloperCircular Buffer Wrap Plan
Map a monotonic sequence number to a ring slot and estimate fixed storage.
Open tool →Developercl100k_base Token Counter
cl100k_base Token Counter with local processing, explicit controls and downloadable results.
Open tool →DataConvert YAML to JSON Online
Convert your YAML files to JSON easily and quickly with our online converter. Fast, secure, and reliable.
Open tool →DeveloperCookie Request Header Parser
Parse Cookie header name/value pairs, preserving duplicate cookie names.
Open tool →DeveloperCPU Instruction Mix CPI
Estimate weighted cycles per instruction for two measured instruction classes.
Open tool →DeveloperCron Checker (6 Fields)
Six-field parsing Next run enumeration Local timezone Names/ranges/steps
Open tool →DeveloperCron Checker (Java / Quartz)
Five/six/seven fields Quartz syntax validation DOM/DOW rules Java scheduler guidance
Open tool →DeveloperCron Formatter
Five/six/seven fields Normalization Field explanation Names and range diagnostics
Open tool →DataCSV Checker
Delimiter detection Header handling Ragged rows Strict quoting Trim/blank policies
Open tool →DataCSV Column Data Profiler
Inspect column emptiness, unique values, numeric counts and numeric ranges.
Open tool →DataCSV Column Selector
Select and reorder named CSV columns.
Open tool →DataCSV Column Splitter
Split a named column into two fields at the first separator.
Open tool →DataCSV Duplicate Checker
Full-row/keyed duplicates Keep first/last Unique/duplicate output Trim/case comparison
Open tool →DataCSV Empty Column Remover
Drop columns whose data cells are all blank or whitespace.
Open tool →DataCSV Formatter
Output delimiter Quoting policy LF/CRLF CSV download
Open tool →DataCSV Formatter (C#)
CSV formatting Quote modes Custom delimiter C# code generation
Open tool →DataCSV Formatter (Python)
CSV normalization Ragged-row padding Table preview Python code generation
Open tool →DataCSV Grouped Sum
Sum a numeric column grouped by a categorical column.
Open tool →DataCSV Header Renamer
Rename CSV headers using a JSON mapping without changing cell values.
Open tool →DataCSV Left Join
Join CSV tables on a key, preserving unmatched left rows.
Open tool →DataCSV Long to Wide Converter
Pivot identifier, variable and value columns into a wide table.
Open tool →DataCSV Numeric Row Sorter
Sort CSV records ascending by a finite numeric column.
Open tool →DataCSV Row Difference
Report rows present only in one of two same-schema tables.
Open tool →DataCSV Row Filter
Filter a CSV column by text, empty values or numeric comparisons.
Open tool →DataCSV Table Concatenator
Append rows from a second table, aligning columns by header name.
Open tool →DataCSV Table Transposer
Swap rows and columns of a rectangular CSV table.
Open tool →DataCSV to JSON Converter
Convert quoted CSV data to JSON objects using its first row as headers.
Open tool →DataCSV to TSV Converter
Change comma-separated data into tab-separated data with quoted-field handling.
Open tool →DataCSV Tool (Windows-Friendly)
File input CSV normalize JSON/TSV conversion CRLF output
Open tool →DataCSV Wide to Long Converter
Turn value columns into variable/value rows while keeping an identifier.
Open tool →DevelopercURL to Fetch Converter
Convert a constrained cURL command into a fetch call without executing it.
Open tool →DataData Table Studio — Clean, Filter & Export
Clean CSV, TSV or JSON tables, filter rows, remove duplicates, group and aggregate values, reorder columns and export with a readable table preview.
Open tool →DataDeduplicate JSON Records
Remove structurally identical JSON values while ignoring object key order.
Open tool →DeveloperDictionary Encoding Size
Estimate a fixed-width dictionary index and dictionary payload for repeated strings.
Open tool →DeveloperDistributed Shuffle Network Volume
Estimate remote bytes when data is uniformly repartitioned across workers.
Open tool →DeveloperDotenv to JSON Converter
Parse simple environment assignments with literal quoted values.
Open tool →DeveloperEnvironment File Difference
Compare dotenv files by added, removed and changed keys without exposing values in the result.
Open tool →DeveloperExternal Merge Sort IO Plan
Estimate initial sorted runs, merge passes and full-dataset disk traffic.
Open tool →FilesFilename Portability Checker
Check filenames for common Windows restrictions, long components and case or Unicode collisions.
Open tool →DataFirst Difference in XML Text
Quickly compare two XML documents in your browser. Paste XML, validate, and see whether they match with a clear diff summary—free and fast.
Open tool →DeveloperFixed Point Representation Error
Quantize a decimal value to signed fixed point and inspect representational error.
Open tool →DeveloperFloating Point ULP Spacing
Estimate normal binary floating-point spacing at a specified magnitude.
Open tool →DataFree CSV Compare Tool
Keyed or row-index matching Ignore order Trim/case options Difference report
Open tool →DataFree CSV Playlist Import Tool
CSV field mapping M3U8 PLS JSON playlist XSPF Durations
Open tool →DataFree CSV Tool
File loading Validate/clean Deduplicate Sort Select columns Download
Open tool →DataFree XML Tools
Validate Format/minify Document info Escape/unescape Declaration/comment policies
Open tool →DeveloperGPU Kernel Launch Overhead
Estimate wall time attributable to launching many small kernels.
Open tool →DataGroup JSON Records
Group a JSON array of records by a chosen property.
Open tool →DataHAR Privacy Redactor
Remove headers, cookies, bodies and query values from a HAR network log locally, retaining request timing and status for debugging.
Open tool →DeveloperHAR Request Timing Analyzer
Summarize request timings, HTTP errors and slow requests from a HAR export.
Open tool →DeveloperHash Table Load Capacity
Plan power-of-two table capacity and unused slots at a chosen maximum load factor.
Open tool →DeveloperHTTP Cache-Control Inspector
Inspect response cache directives and identify malformed ages or conflicting public/private instructions.
Open tool →DeveloperHTTP Link Header Parser
Inspect simple Link header entries with URL targets and parameters.
Open tool →DataICS Calendar to CSV
Extract event definitions, timestamps, locations and recurrence rules from an exported calendar.
Open tool →DeveloperInfer JSON Schema from a Sample
Generate a conservative structural schema from one JSON sample.
Open tool →DeveloperINI to JSON Converter
Parse simple INI sections and key/value assignments into JSON.
Open tool →DeveloperInteger Counter Wrap Horizon
Estimate the remaining time before an unsigned fixed-width event counter wraps.
Open tool →DeveloperIPv4 CIDR Membership Tester
Check which IPv4 addresses fall inside a selected CIDR block.
Open tool →DeveloperIPv4 CIDR Subnet Calculator
Calculate subnet mask, network range and usable addresses from an IPv4 CIDR.
Open tool →DeveloperJava Regex Snippet Builder with JavaScript Preview
Java string decoding Java Pattern snippets JS match/replace preview compatibility warnings
Open tool →DataJoin JSON Arrays by Key
Left-join object arrays on a unique key from the right-hand array.
Open tool →DataJSON Array to NDJSON
Serialize each array item on its own newline-delimited JSON line.
Open tool →DataJSON Diff Formatter
Structural diff Added/removed/changed values JSON Patch Ignore array order
Open tool →DeveloperJSON Key Sorter
Recursively alphabetize object keys while preserving array order.
Open tool →DeveloperJSON Merge Patch
Apply RFC 7396 merge-patch semantics; null removes an object property.
Open tool →DeveloperJSON Minifier
Remove unnecessary JSON whitespace while preserving the parsed data.
Open tool →DataJSON Object to Entry Pairs
Convert an object to ordered key/value tuples for tabular processing.
Open tool →DeveloperJSON Patch Applier
Apply add, remove, replace, test, move and copy operations using JSON Pointer paths.
Open tool →DeveloperJSON Path Query
Extract a specific value from nested JSON using safe property and array paths.
Open tool →DataJSON Pointer Flattener
Flatten nested JSON into escaped JSON Pointer paths and leaf values.
Open tool →DeveloperJSON Property Byte Breakdown
Measure serialized UTF-8 sizes of top-level JSON property values.
Open tool →DeveloperJSON Schema Example Builder
Generate a sample JSON value from explicit object, array, scalar, enum and numeric constraints.
Open tool →DeveloperJSON Schema Subset Validator
Validate common JSON Schema constraints and report unsupported keywords.
Open tool →DataJSON to CSV Converter
Convert an array of objects to CSV with quoted fields and a combined header.
Open tool →DeveloperJSON to TOML
Convert JSON files to TOML with format-specific validation and downloadable output.
Open tool →DataJSON to TypeScript Type
Infer a TypeScript type from a JSON example, including nested objects, mixed arrays, nullable values and quoted property names.
Open tool →DataJSON Tools Plugin for Notepad++ 64-bit Download (x64) — Install Helper
64-bit plugin setup guide Portable/manual paths Install-folder customization
Open tool →DeveloperJSON Validator
Check JSON syntax and identify the root data type.
Open tool →DataJSON, XML and SQL Formatting Helper
auto JSON/XML/SQL pretty/minify JSON sorting SQL uppercase/compact
Open tool →DataJSON-LD Syntax and Heuristic Linter
multi-block extraction context normalization graph/type summary optional common-field hints
Open tool →DataJSONC Formatter for Comments and Trailing Commas
JSONC comments Trailing commas Pretty/minify Tabs Sorting
Open tool →DeveloperLINQ Query to Parameterized SQL
Convert a documented LINQ query-expression subset into PostgreSQL, MySQL or SQL Server SQL with separate parameters.
Open tool →DeveloperMemory Stride Cache Line Use
Estimate useful bytes per touched cache line for regularly strided accesses.
Open tool →DataNDJSON to JSON Parser
Parse newline-delimited JSON into an array, with source-line error reporting.
Open tool →DataNested CSV to JSON Converter
Convert CSV columns with dotted headers into nested JSON, with selectable delimiters, optional type inference and empty-value handling.
Open tool →DataNotepad++ CSV Formatter
Input/output delimiter CSV/TSV/Markdown/aligned text Ragged padding Line endings
Open tool →DataOnline Converter: SQL to MySQL
T-SQL to MySQL rewrites identifier/type/function options paging conversion
Open tool →DeveloperOnline Cron Converter Download
uploaded cron batches human descriptions TXT JSON CSV output error limits
Open tool →DataOnline CSV Converter
CSV JSON bidirectional TSV pipe Markdown NDJSON delimiter detection headers and trim
Open tool →DataOnline CSV File Generator
JSON column specifications seeded synthetic rows sequence dates UUID email CSV quoting/newline controls
Open tool →DataOnline CSV Generator
DSL column specifications seeded data typed random values header delimiter quoting controls
Open tool →DataOnline Formatter XML
XML parse validation pretty/minify indent preserve declaration remove comments
Open tool →DataOnline JSON Converter
JSON pretty/minify/validate CSV export query strings escape/unescape lenient syntax
Open tool →DataOnline JSON Converter from String
escaped JSON unwrapping parse/stringify indent/minify
Open tool →DataOnline JSON Converter to CSV
JSON to delimited table nested flatten root wrappers quote/null/header options
Open tool →DataOnline JSON Generator
key paths to nested JSON value coercion object/array roots strict mode
Open tool →DataOnline JSON Generator from Java Class
Java class field parsing type-derived JSON example nested/collection subset
Open tool →DataOnline JSON Generator from Schema
Generate example JSON from a JSON Schema directly in your browser. Supports objects, arrays, enums, defaults/examples, formats, and local $ref. Fast, client-side, no uploads.
Open tool →DeveloperOnline JSON Schema Converter
JSON inference schema sample generation OpenAPI components draft/required/additionalProperties controls
Open tool →DeveloperOnline Kubernetes YAML Generator
Generate Kubernetes YAML configuration files effortlessly with our online tool. Perfect for developers looking to streamline their Kubernetes workflows.
Open tool →DeveloperOnline Regex Converter to Text
regex literal escape/unescape delimiter/anchor stripping visible control escapes
Open tool →DeveloperOnline Regex Generator (Python)
example-derived patterns literal escaping Python flags/snippet matching preview
Open tool →DataOnline SQL Generator
JSON-driven CRUD SQL parameter binding multirow insert dialect quoting
Open tool →DataOnline SQL Generator: CREATE TABLE
CREATE TABLE four dialects schema/constraints identity/composite PK drop-if-exists
Open tool →DataOnline SQL Query Generator
form-based CRUD SQL raw WHERE/ORDER/SET identifier checks unsafe-write guard
Open tool →DataOnline XML Converter
XML/JSON interchange attributes and text nodes pretty/minify escape/unescape
Open tool →DataOnline XML Generator
JSON to XML custom root/item tags attributes tag sanitization declaration
Open tool →DataOnline XML Generator from XSD
XSD to sample XML root selection simple/complex types occurrence/depth controls
Open tool →DeveloperOnline XML to Schema Converter (XSD)
XML to XSD type inference attributes repeating elements complex sequences
Open tool →DeveloperOnline XSD to JSON Schema Converter
XSD to JSON Schema draft selection named definitions attributes required/arrays
Open tool →DeveloperParameterized SQL Insert Builder
Generate an INSERT statement and separate parameter values from a JSON record array.
Open tool →DeveloperPartition Hot Key Skew
Estimate a hot partition load when one key dominates otherwise uniform traffic.
Open tool →DataPasted CSV and TSV to XML
delimited table to XML header-derived tags tag sanitization root/row names
Open tool →DataPostgres SQL Checker
dollar-quoted strings nested comments statement/semicolon checks
Open tool →DeveloperQuartz Cron Formatter
Five to six-field conversion Quartz normalization Optional year
Open tool →DeveloperQuery String Inspector & Sorter
Decode URL query pairs, identify duplicate keys and generate a sorted query.
Open tool →DeveloperRAG Character Chunk Explorer
RAG Character Chunk Explorer with local processing, explicit controls and downloadable results.
Open tool →DeveloperRaw HTTP Request Parser
Parse an HTTP/1 request line, unfolded headers and body as text.
Open tool →DeveloperRaw HTTP Response Parser
Parse an HTTP/1 response status line, headers and textual body.
Open tool →DeveloperRegex Online Converter
regex source to JSON string JavaScript constructor snippet
Open tool →DeveloperRegex Tool Online
test/match/replace/split slash-pattern parsing structured JSON result
Open tool →DataRename JSON Properties
Recursively rename object keys using an explicit mapping, rejecting collisions.
Open tool →DeveloperRun Length Encoding Budget
Compare raw values with value-and-count pairs using a measured number of runs.
Open tool →DeveloperSemantic Version Comparator
Compare semantic versions using numeric prerelease precedence and ignoring build metadata.
Open tool →DeveloperSIMD Tail Lane Utilization
Count vector iterations and inactive lanes in a final masked vector.
Open tool →DeveloperSparse CSR Matrix Memory
Compare compressed sparse row arrays with a dense numerical matrix.
Open tool →DeveloperSpring Cron Formatter
Spring cron normalization field labels simple human hints
Open tool →DataSQL Checker
SQL lexical checks DML WHERE warning formatting dialect options
Open tool →DataSQL Checker (Oracle)
Oracle lexical scan dialect incompatibility hints multi-statement warning
Open tool →DataSQL Dialect Rewrite Helper
four SQL dialects identifier quoting pagination type mapping
Open tool →DataSQL Formatter (VSCode-Friendly)
SQL pretty/minify keyword casing comment options editor setting snippet
Open tool →DeveloperSQL IN-Clause Parameter Builder
SQL IN-Clause Parameter Builder with local processing, explicit controls and downloadable results.
Open tool →DeveloperStorage IOPS Throughput and Queue
Translate IOPS and request size to bandwidth and average outstanding requests.
Open tool →DataStrict JSON Formatting and String Escaping Workspace
Strict validate Pretty/minify Key sort JSON string escape/unescape Tab indentation
Open tool →DeveloperStructure Cache Line Padding
Compare compact structures with line-rounded slots for avoiding adjacent sharing.
Open tool →DeveloperTOML to JSON
Convert TOML files to JSON with format-specific validation and downloadable output.
Open tool →DataTSV to CSV Converter
Convert tab-separated tables to comma-separated values.
Open tool →DeveloperTypeScript Formatter
Format TypeScript with the real Prettier parser, preserving string values and comments.
Open tool →DataTypeScript String Union Builder
Turn a list of allowed values into an escaped TypeScript string-literal union, removing duplicate entries locally.
Open tool →DeveloperUnix Permission Bits Decoder
Translate octal permission bits into rwx notation including setuid, setgid and sticky bits.
Open tool →DeveloperUnix Timestamp Converter
Convert Unix seconds, Unix milliseconds or an explicit-zone ISO date to UTC.
Open tool →DeveloperURL Parser
Inspect a URL hostname, path, query parameters and fragment.
Open tool →DeveloperURL Query Parameter Merger
Merge query key/value pairs into a URL, preserving fragments.
Open tool →DeveloperUUID Syntax Checker
Check UUID formatting, version 1–8, and the RFC variant.
Open tool →DataVCF Contact Deduplicator
Remove repeated contacts by primary email or phone while keeping the first matching record.
Open tool →DataVCF to CSV Contacts
Export names, email addresses, phone numbers and organizations from a vCard contact list to a spreadsheet.
Open tool →DeveloperWeb Access Log Analyzer
Count request status codes, response bytes and frequent paths in access logs.
Open tool →DataXML Checker (DayZ)
XML well-formedness DayZ economy hints duplicate type names pretty/minify
Open tool →DataXML Formatter for VS Code
XML validate/pretty/minify mixed content format options LF/CRLF
Open tool →DataXML Structure and Tree Inspector
XML file loading syntax diagnostics tree view invalid-character removal
Open tool →DataXML to CSV, TSV and SpreadsheetML
XML row inference attributes/nested flattening CSV TSV HTML SpreadsheetML XML
Open tool →DataXML Tools Notepad++ — Manually Install (ZIP/DLL) + Folder Path Generator
Notepad++ install plan bitness mismatch warning portable/installer paths
Open tool →DataXML Tools Plugin for Notepad++ — Online Formatter, Validator & XPath
XPath query XML syntax pretty/minify
Open tool →DataXML Validation against an XSD Subset
XSD sequence subset required attributes basic lexical types/enums order/occurrence checks
Open tool →DataYAML Checker Online
YAML parser YAML to JSON YAML dump
Open tool →DataYAML Formatter
Format YAML with consistent indentation and spacing, keep comments, and catch common indentation mistakes. Runs in your browser with copy and reset.
Open tool →DataYAML Formatter and PyYAML Script Builder
Format YAML using the bundled parser, then generate Python formatting scripts.
Open tool →DataYAML Formatter and VS Code Settings Builder
Format YAML using the bundled parser, then generate VS Code YAML settings.
Open tool →DataYAML Formatter Online
line-based reindent trailing whitespace cleanup
Open tool →DataYAML Tool Like jq
YAML parsing dot-property extraction JSON result
Open tool →DataYAML Tools
YAML default-schema parser YAML to JSON YAML format
Open tool →