Random String Generator: Create Tokens, IDs, and Test Data
Generate random strings for API keys, test data, and unique identifiers. Custom length, character sets, and batch generation.
# Random String Generator: Create Tokens, IDs, and Test Data
Every developer needs random strings — for API keys, test fixtures, unique identifiers, nonce values, and session tokens. FreeToolJet's Random String Generator creates them in bulk with full control over length, character sets, and output format.
Features
- Custom length: 4 to 128 characters per string.
- Character selection: Uppercase, lowercase, numbers, symbols — pick your combination.
- Exclude ambiguous characters: Remove lookalikes (0/O, 1/l/I) for readability.
- Batch generation: Create up to 20 strings at once.
- Custom character set: Add specific characters your application requires.
Common Use Cases
- API keys and tokens: Generate test keys for local development.
- Test fixtures: Create realistic-looking IDs for database seeds.
- Nonce values: Generate unique strings for security challenges.
- Coupon codes: Create alphanumeric codes with no ambiguous characters.
Security Note
This tool uses Math.random() which is not cryptographically secure. For production secrets, passwords, or authentication tokens, use a dedicated cryptographic random generator (like crypto.randomUUID() or openssl rand). This tool is ideal for development, testing, and non-security use cases.
Tips for Readable Strings
- Enable "No ambiguous" to remove characters that look similar in monospace fonts.
- Use shorter strings (8-12 chars) for coupon codes and longer ones (32+ chars) for API keys.
- Exclude symbols if the string will be used in URLs or filenames.
Related Tools
- Password Generator — Generate secure passwords with crypto-grade randomness
- UUID Generator — Create standard UUIDs (v4)
- Hash Generator — Hash strings with MD5, SHA-1, or SHA-256
Want more tools? Explore our full collection at FreeToolJet - we're constantly adding new utilities based on developer feedback.