Free Random String Generator

01 · Definition

What is random string generator?

A random string generator creates synthetic identifier, token and code-like values for test data, validation flows and import fixtures. It helps developers produce repeatable UUID, Nano ID style, ULID, hexadecimal, numeric, symbol and custom-character strings without storing production identifiers in non-production datasets.

The tool above sends your count, locale, seed, method, length, casing, prefix, character-source, exclusion, leading-zero and reference-date options to the Spotzee Extended API, then renders returned strings[] records. Use profile for expanded records, or choose UUID, ULID, Nano ID, alphanumeric, hexadecimal, numeric, symbol or custom output. Read the in-depth random string generator guide for endpoint options, response fields and fixture design notes.

02 · Process

How it works

1. 1Enter a count.Type the number of string records to generate, from 1 to 100.
2. 2Choose an output.Pick expanded records, identifier output, random strings, base strings or custom-character output.
3. 3Set string controls.Use length, casing, prefix, character-source, exclusion, leading-zero and reference-date controls when the selected method supports them.
4. 4Set repeatability.Add a numeric seed when the same generated output must repeat in tests.
5. 5Generate fixtures.The server validates the options, forwards a form-encoded request to /generic/data/generate/string and renders the returned string records.

03 · Risk

Why it matters

String fixtures sit inside import jobs, account records, token fields, validation rules, form tests and URL builders. If every test uses one hand-written value, you miss casing, prefix, length, special-character and parser paths that only fail with varied input.

A free string fixture generator gives you controlled variation without using real identifiers. You can run a UUID generator online for one field, switch to random string output with special characters for validation tests, or seed output for Java, Python and JavaScript fixture scripts.

04 · Use cases

Common ways to use this tool

• Identifier fixture generation. Generate UUID, ULID and Nano ID style values for API, database and UI tests.
• Validation workflow QA. Create alpha, alphanumeric, numeric and symbol strings to test format rules and unhappy paths.
• Import and seed scripts. Use seeded string fixtures when Java, Python or JavaScript test setup needs repeatable IDs.
• Custom character testing. Use custom-character output when a parser or form only allows a known character set.
• Prefix and base-string checks. Generate binary, hexadecimal and octal strings with optional prefixes for code-field tests.

05 · Interpretation

What to check in the result

• Count outside 1 to 100. The API accepts up to 100 string records per request. For larger datasets, call the endpoint multiple times.
• Exact length mixed with range. Use either exact length or a minimum/maximum length range, not both.
• Length on UUID or ULID output. Length controls apply to random, base, custom, Nano ID and profile output, not UUID or ULID output.
• Missing custom characters. Custom output maps to method=fromCharacters, so the character-source field is required.
• Prefix on the wrong method. Prefix applies to binary, hexadecimal, octal and profile output only.
• Bad reference date. Reference dates must be ISO 8601 date-times with a time-zone offset, and only apply to ULID and profile output.