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Guides for the tools on this site — and the problems that send people looking for them.
JSONJSON Formatter: The Complete Guide to Format, Validate & Debug JSONThe complete JSON formatter guide — syntax rules, real parser errors, security risks, and precision bugs. Free, client-side JSON formatter, no sign-up.DatabaseUUID Generator: The Complete Guide to UUID v4, v7 & GUIDsFree UUID generator for UUID v4 and v7 — client-side, no sign-up. Covers UUID vs GUID, collision odds, and code for Python, JS and SQL.RegexRegex Tester: Test and Debug JavaScript Regular Expressions OnlineFree regex tester for JavaScript patterns — live match highlighting, named groups, replace preview. No sign-up, runs in your browser.APIcURL to Python: Convert Any cURL Command to requests CodeConvert curl to Python requests code free — headers, JSON bodies, multipart uploads, Basic Auth and cookies mapped correctly. No sign-up.SQLSQL Formatter: Beautify SQL for Postgres, MySQL and SQL ServerFree SQL formatter for PostgreSQL, MySQL and SQL Server — clauses on their own lines, dialects explained, no sign-up, no ads.JSONIs My JSON Valid? How to Tell Syntax Errors from Schema MismatchesCheck if JSON is valid free online — tells syntax errors from schema mismatches, with fixes for common JSON errors. No sign-up.JSONCSV to JSON: Convert Spreadsheet Data to JSON OnlineConvert CSV to JSON free online — array, nested, or JSON Lines output, RFC 4180 quoting, no upload required.JSONJSON Diff: Compare Two JSON Files and Spot Every Real ChangeJSON diff tool, free online — compare two files structurally, ignoring key order and whitespace, with JSON Patch export.JSONJSON Schema Validator: Validate JSON Against Draft 2020-12Free JSON Schema Validator (draft 2020-12) online — validate JSON structure with errors located by JSON Pointer. No sign-up.JSONJSON Minifier: Compress JSON and See the Exact Byte SavingsFree JSON minifier — strip whitespace and see exact byte savings. Parses first, so invalid JSON is located, not mangled.JSONJSON to TypeScript: Generate Interfaces from Any JSON SampleFree JSON to TypeScript converter — generates interfaces from samples, merging fields into optional props and unions.