Free Developer Tools

A collection of free tools for generating test data, looking up postal codes, and formatting addresses. No sign-up required.

Need larger test-data workflows?

Pro unlocks bulk generation, CSV/JSON/SQL export, saved presets, seeded output, API access, and usage tracking.

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Address Generator

Generate realistic random addresses for 120+ countries. Includes street, city, state, ZIP code, phone number, and coordinates.

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ZIP Code Lookup

Look up ZIP/postal codes by city or find cities by ZIP code. Covers US, UK, Canada, Australia, Germany, France, and more.

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Phone Number Generator

Generate random phone numbers in the correct format for any country. Includes proper area codes and formatting.

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Name Generator

Generate random realistic names for testing. Supports multiple nationalities and formats including first name, last name, and full name.

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Test User Generator

Generate realistic test users with names, emails, usernames, UUIDs, and addresses for QA, demos, and seed data.

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CSV & JSON Mock Data Generator

Create structured mock rows for databases, fixtures, demos, and QA workflows. Export clean CSV or JSON instantly.

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JSON Formatter and Validator

Format, minify, and validate JSON for API fixtures, mock responses, and QA datasets.

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JSON to CSV Converter

Convert JSON arrays and objects into CSV rows for spreadsheets, imports, and testing workflows.

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CSV to JSON Converter

Convert CSV rows into structured JSON for API fixtures, seed data, and mock services.

csv to jsonconvert csv to jsonjson fixture

SQL Insert Generator

Convert CSV or JSON test data into SQL INSERT statements for seed files and staging databases.

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Password Generator

Generate random passwords for test accounts, QA credentials, staging users, and demos.

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Timestamp Converter

Convert Unix timestamps, milliseconds, ISO strings, and UTC dates for logs and APIs.

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User-Agent Generator

Generate browser User-Agent strings for analytics QA, device tests, mock logs, and demos.

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Regex Tester

Test JavaScript regular expressions for form validation, parsers, postal codes, and QA rules.

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Postal Code Regex Tester

Test ZIP and postal code regex patterns for international checkout and address validation.

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UUID Generator

Generate random UUID v4 identifiers for databases, API tests, logs, fixtures, and local development.

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Random Email Address Generator

Generate safe placeholder email addresses for test accounts, form validation, QA scripts, and seed data.

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Address Formatter

Format and standardize addresses for any country. Convert messy address data into properly formatted postal addresses.

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Random IP Address Generator

Generate IPv4 and IPv6 values for network UI tests, mock logs, documentation, and API fixtures.

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Random MAC Address Generator

Generate MAC addresses for mock device records, import tests, network QA, and demos.

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Name and Address Generator

Generate synthetic customer records with names, emails, phone numbers, UUIDs, and addresses.

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