JSON Formatter Online – Format & Beautify JSON
Format and beautify JSON locally with 2-space, 4-space, or tab indentation, optional key sorting, syntax checks, and no uploads.
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Discover the latest VetaTool tools, technical guides, and focused troubleshooting references from one stable index. Dates reflect real content changes rather than automatic daily refreshes.
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41 recent updates
CSV to SQL Converter – Generate MySQL INSERT Statements
Convert CSV to MySQL INSERT statements in your browser. Edit column names, choose batch size, and safely escape quotes without uploading your data.
View updateDocker Run to Compose Converter – Generate compose.yaml Online
Convert a docker run command into Compose Specification YAML locally. Map ports, volumes, environment, networks and restart settings without running Docker.
View updateHMAC SHA-256 Generator Online – Sign Messages Locally
Generate HMAC-SHA256 from a secret key and message locally. Choose UTF-8, Hex or Base64 bytes; copy Hex/Base64 signatures without uploading secrets.
View updateIPv4 Subnet Calculator Online – CIDR & Host Range
Calculate IPv4 CIDR network, subnet mask, broadcast address, host range and binary octets locally. Handles /0, /31 and /32 without uploading data.
View updateJSON to Rust Struct Converter Online – Serde Code Generator
Generate Rust structs with Serde JSON field rename attributes from sample JSON locally. Handle nested objects, nullable values, arrays, and unusual keys.
View updateQR Code Generator Online – Create PNG & SVG Locally
Generate QR codes for URLs or text locally. Choose error correction and PNG size; download PNG or SVG without uploading content or tracking scans.
View updateTOML to JSON Converter Online – Local TOML Parser
Convert TOML configuration to readable JSON locally. Supports tables, arrays of tables, dates and strings with explicit errors for unsupported syntax.
View updatecURL to Code Converter – Fetch, Go & Python
Convert a cURL request to JavaScript Fetch, Go net/http or Python Requests code locally. Mask common API secrets and inspect unsupported options before copying.
View updateJSON to Zod Schema Online – Generate Zod Validators
Generate Zod 4 schemas from JSON samples locally, including nested objects and arrays. Copy TypeScript code without uploading API payloads.
View updateCron Expression Parser – Next Run Times
Parse five-field Unix cron expressions, explain minute/hour/day rules, and preview five upcoming UTC or local execution times in your browser.
View updateJavaScript Regex Cheat Sheet – Quick Reference & Examples
JavaScript regex quick reference for character classes, anchors, quantifiers, groups, lookarounds, flags, replacements, and copyable examples.
View updateJSON Transfer Time Calculator – Payload Size & Bandwidth
Estimate ideal JSON payload transfer time from bytes, KB, KiB, MB, MiB, GB, or GiB and network throughput in bits/s or bytes/s. Runs locally.
View updateTimestamp Add/Subtract Calculator – Unix & ISO
Add or subtract seconds, minutes, hours, or days from a Unix or ISO timestamp. Get the shifted ISO 8601 instant, Unix seconds, and milliseconds locally.
View updateTimestamp Duration Calculator – Unix & ISO Difference
Calculate the signed duration between two Unix or ISO 8601 timestamps, with millisecond, second, minute, hour, and day results. Runs locally.
View updateBase64 Size Calculator – Encoded Length & Overhead
Calculate exact padded Base64 length with 4 × ceil(bytes / 3), including padding characters and encoding overhead, locally in your browser.
View updateJSON Compression Ratio Calculator
Calculate JSON compression ratio and percentage savings from original and compressed byte sizes, even when the two inputs use different units.
View updateJSON Size Calculator – Bytes, KiB & MiB
Calculate total JSON payload size from one measured payload and a payload count, with byte, KiB, and MiB breakdowns. Runs locally in your browser.
View updateHashing Text vs Bytes & Encoding Pitfalls
Learn why hashes depend on exact bytes, how UTF-8 encodes text, and why BOMs, Unicode normalization, line endings, hex, and Base64 cause hash mismatches.
View updateBase64 Encoder & Decoder Online
Encode UTF-8 text or hexadecimal bytes to Base64, create unpadded URL-safe Base64 (Base64URL), and decode either variant as UTF-8 text or hexadecimal bytes locally in your browser.
View updateHash Generator Online – MD5 & SHA
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 digests from UTF-8 text or decoded Hex and Base64 bytes locally in your browser.
View updateQuery String Parser & Builder Online
Parse full URLs or raw query strings into JSON, build encoded queries, clean and sort parameters, remove empty, duplicate, or tracking pairs, and preserve repeated parameters with distinct values locally.
View updateURL Encoder & Decoder Online
Encode or decode URL components with encodeURIComponent-compatible percent encoding, convert application/x-www-form-urlencoded values, remove tracking parameters, clean and sort absolute URLs in one pass, normalize URLs, or parse them locally.
View updateUUID Generator & Validator Online
Generate UUID v4 or time-ordered UUID v7 batches, validate canonical UUID format and version, and decode embedded UUID v7 timestamps locally.
View updateHash Base64 String vs Decoded Text – aGVsbG8= vs hello
Compare SHA-256 for literal Base64 text aGVsbG8= and decoded hello content and see why pre-hash decoding changes the digest.
View updateHash Hex String vs Bytes – Why 68656c6c6f Differs from hello
Compare SHA-256 for the literal hex text 68656c6c6f and its decoded hello content and see why representation matters.
View updateUUID v7 Validation – Check Version 7 UUID Online
Validate canonical UUID v7 text, identify its version and RFC-compatible variant, and decode the embedded Unix-millisecond timestamp locally.
View updateCase Converter Online – Change Text Case
Convert text to uppercase, lowercase, Sentence case, Title Case, camelCase, PascalCase, snake_case, CONSTANT_CASE, dot.case, kebab-case, or URL slugs locally in your browser.
View updateHex Encoder & Decoder Online
Encode UTF-8 text to hexadecimal bytes or decode compact and whitespace-separated hex back to valid UTF-8 text locally in your browser.
View updateHTML Entity Encoder & Decoder Online
Encode HTML-sensitive characters such as ampersands, angle brackets, and quotes, or decode common named and numeric HTML character references locally in your browser.
View updateJSON to Go Struct Converter Online
Convert JSON to Go structs locally with exported field names, JSON tags, nested types, array inference, and no sample-data uploads.
View updateNumber Base Converter Online – Decimal, Hex & Binary
Convert whole numbers between decimal, hexadecimal, binary, and octal locally in your browser with BigInt precision for large integers.
View updateJWT Decoder Online
Decode JWT header and payload JSON locally, inspect exp, nbf, and iat time status, and remember that the signature is not verified.
View updateCSV Quoting, Delimiters & Column Rules Explained
Understand CSV quoting, comma, semicolon, and tab delimiters, consistent column counts, header rules, multiline fields, and safe CSV-to-JSON conversion.
View updateQuery String Encoding & Repeated Parameters Explained
Understand query string percent encoding, plus signs, repeated parameters, empty values, fragments, and how JSON arrays map to repeated query keys.
View updateSQL Formatting vs Validation: What a Formatter Checks
Learn the difference between formatting SQL and validating it, including dialect syntax, schema checks, execution errors, query safety, and a practical review workflow.
View updateUUID Versions, Variants & Validation Explained
Understand UUID versions 1 through 8, RFC variant bits, canonical UUID text, and what structural UUID validation can and cannot prove.
View updateXML Parsing & Validation Errors Explained
Understand XML parsing and well-formedness errors, how to read parser messages, and how tags, entities, attributes, namespaces, and document structure cause validation failures.
View updateSQL Formatter & Minifier Online
Format SQL locally with selectable dialect and preserved, uppercase, or lowercase keywords, or minify it while preserving quoted strings and comments.
View updateJWT Invalid JSON Header – Fix Decoded Header JSON
Diagnose a JWT whose first segment decodes correctly but is not a JSON object containing header parameters such as alg, typ, or kid.
View updateJWT Invalid JSON Payload – Fix Decoded Claim JSON
Diagnose a JWT payload that decodes from Base64URL but contains malformed JSON claim syntax, such as a trailing comma.
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