Backend Developer Toolkit
Format data, generate IDs, model schemas, and wrangle config — all in one place.
Backend work is a steady stream of data plumbing: format a query, validate a config, generate an ID, parse a cron schedule, produce test fixtures. This workspace collects the utilities that come up between writing the actual logic — the connective tissue of building and shipping services.
All local, all instant, so config files and query fragments never touch a third-party server.
The workflow
- 1
Format & validate JSON
Clean up API payloads and config files, and catch structural errors before they ship.
- 2
Tidy your SQL
Format long or minified queries so joins and subqueries are reviewable.
- 3
Generate IDs & fixtures
Create UUIDs for keys and idempotency, and mock data for tests and seeds.
- 4
Decode a cron schedule
Turn a cron expression into a plain-English schedule to confirm when a job actually runs.
Tools in this workspace (9)
JSON Formatter & Validator
Format, validate, and minify JSON with exact line errors, a searchable tree, and private processing.
SQL Formatter
SQL beautifier for 20 dialects with keyword case, spaces or tabs, copy and .sql download.
YAML ⇄ JSON Converter
Convert one YAML document to JSON or back with safe JSON-compatible types, indentation and downloads.
UUID Generator
Generate 1 to 100 random version-4 UUIDs at once, using your device's cryptographic randomness.
Hash Generator
Hash text or hex bytes with SHA algorithms, compare an expected digest and download results.
Cron Expression Parser & Builder
Build cron expressions and see their next run times explained.
Mock Data Generator
Generate repeatable test data from a custom schema; export JSON, CSV, NDJSON or SQL.
JSON to TypeScript
Generate TypeScript interfaces from a JSON sample.
Timestamp Converter
Convert Unix timestamps and dates with explicit units, UTC, batch errors and CSV downloads.
Frequently asked questions
What are the essential online tools for backend developers?＋
A JSON formatter, SQL formatter, YAML/JSON converter, UUID generator, hash generator, cron parser, and a mock-data generator cover most day-to-day backend chores — all bundled here.
Are these tools private?＋
Yes — everything runs in your browser, so your queries, configs, and data stay on your machine.
Is it free?＋
Yes — free and unlimited, no signup.
Related workflows
Last updated August 2026