JSON, YAML, XML & Config Studio
Validate, format, minify, sort keys, and convert across JSON, YAML 1.2, XML, and .env/INI configs, query deep paths, validate JSON Schema, and generate TypeScript/JSON-Schema types.
Client-Side Developer & Data Studios
Inspect structured API payloads, infer SQL DDL, minify JS/CSS/HTML bundles, debug regular expressions and globs, render Flowchart/Sequence/ERD SVGs, and verify cron runs locally.
Updated
37+ tools across 11 categories
Top free tools
CSV, TSV & SQL Data Studio
Convert RFC 4180 CSV/TSV ↔ JSON, YAML, and Markdown tables, filter/sort columns in an interactive grid, generate typed SQL CREATE/INSERT scripts, and format PostgreSQL/MySQL/SQLite queries.
JS, CSS & HTML Code Studio
Minify, mangle, or beautify JavaScript (via Terser AST), CSS, and HTML in your browser with instant raw, minified, and real GZIP byte-savings comparisons.
Regex & Glob Pattern Studio
Test ECMAScript regular expressions with live capture groups and substitutions, inspect deterministic token-by-token regex explanations, and match .gitignore/bundler glob patterns.
Encoding, URL & Unicode Studio
UTF-8 Base64 & Base64URL encoder/decoder, local file Data URI builder, interactive URL & query-param editor, HTML entity/JSON string escaper, and Unicode/Hex/Binary byte inspector.
Flowchart, Sequence & ER Diagram Studio
Author deterministic Flowcharts, Sequence Diagrams, and Database Entity-Relationship (ER) schemas from clean text DSLs with live SVG layout and high-DPI PNG/SVG export.
Cron, Timestamp & Timezone Studio
Translate 5-field cron schedules into plain English with next 10 IANA runs, convert Unix epoch (s/ms/μs) ↔ ISO 8601, compare global timezone overlaps, and compute business-day deltas.
Mock Data & Fixture Studio
Build reproducible seed-driven mock datasets with 18 realistic field types (names, emails, UUIDs, IPv4, dates, Luhn test cards, prices) and export up to 1,000 rows as JSON, CSV, SQL, or TypeScript.
All tools in this topic
Developer & Code Studios
Cron, Timestamp & Timezone StudioTranslate 5-field cron schedules into plain English with next 10 IANA runs, convert Unix epoch (s/ms/μs) ↔ ISO 8601, compare global timezone overlaps, and compute business-day deltas.Encoding, URL & Unicode StudioUTF-8 Base64 & Base64URL encoder/decoder, local file Data URI builder, interactive URL & query-param editor, HTML entity/JSON string escaper, and Unicode/Hex/Binary byte inspector.Flowchart, Sequence & ER Diagram StudioAuthor deterministic Flowcharts, Sequence Diagrams, and Database Entity-Relationship (ER) schemas from clean text DSLs with live SVG layout and high-DPI PNG/SVG export.JS, CSS & HTML Code StudioMinify, mangle, or beautify JavaScript (via Terser AST), CSS, and HTML in your browser with instant raw, minified, and real GZIP byte-savings comparisons.Regex & Glob Pattern StudioTest ECMAScript regular expressions with live capture groups and substitutions, inspect deterministic token-by-token regex explanations, and match .gitignore/bundler glob patterns.
Data, SQL & Analytics Studios
Chart, Graph & Statistics StudioRender 8-type multi-series Chart.js visualizations from CSV/table data with high-DPI PNG export, plus descriptive statistics (mean, median, IQR, std dev, histogram) and linear regression.CSV, TSV & SQL Data StudioConvert RFC 4180 CSV/TSV ↔ JSON, YAML, and Markdown tables, filter/sort columns in an interactive grid, generate typed SQL CREATE/INSERT scripts, and format PostgreSQL/MySQL/SQLite queries.JSON, YAML, XML & Config StudioValidate, format, minify, sort keys, and convert across JSON, YAML 1.2, XML, and .env/INI configs, query deep paths, validate JSON Schema, and generate TypeScript/JSON-Schema types.Mock Data & Fixture StudioBuild reproducible seed-driven mock datasets with 18 realistic field types (names, emails, UUIDs, IPv4, dates, Luhn test cards, prices) and export up to 1,000 rows as JSON, CSV, SQL, or TypeScript.
Developer Studios FAQ
Quick answers about the workflow, privacy, and where this tool fits in a broader job.
Are API payloads, SQL queries, or tokens sent to a backend server?
No. Parsing, validation, minification, diagram rendering, and schema generation execute inside your browser tab.
Related free tool collections
Browser Cryptography & Auth StudiosGenerate CSPRNG passwords, UUID v7, and ULIDs, compute SHA/HMAC file checksums, test bcrypt & AES-256-GCM, and debug JWT, PKCE S256, and TOTP 2FA locally.Finance, Engineering & Statistical Chart StudiosModel loan amortization CSVs, ROI/CAGR, and break-even thresholds, convert 10 physical & IEC unit categories, run BigInt base math, and plot statistical charts.
The complete toolkit
37+ free browser tools
Every tool runs instantly in your browser — no account, no download, no cost. Across 11 categories for everyday tasks.