UUID Bulk Generator

A bulk UUID generator creates many UUID identifiers in one browser session for test fixtures, database seed data, API payloads, imports, migrations, and distributed-system examples. This tool generates a bounded batch and lets you review its uniqueness and export format before copying or downloading it.

The workspace accepts 1 to 5,000 values and caps larger requests locally for browser performance. The generated count and cap warning are shown in the results panel so you can review the actual batch size.

Yes. UUID v4 is random and general purpose. UUID v7 includes a Unix-millisecond timestamp and random suffix, which can help approximate chronological ordering while also exposing approximate creation time. Select the version before generating the batch.

The export selector supports one-per-line text, a JSON array, NDJSON records with index and version, CSV with index/UUID/version columns, an SQL INSERT statement, a JavaScript array declaration, and a JSON payload array based on the local body template.

Yes. CSV export includes an index, UUID, and version column. Values are quoted safely for CSV text. Use the result for fixtures or import preparation, then verify the destination schema and delimiter expectations before loading it.

Yes. Enter a table name and choose SQL INSERT statement. The generator sanitizes the table identifier and quotes each generated value. The result is a text template, not a database execution step, so review the column name, schema, constraints, and SQL dialect before running it.

NDJSON, or newline-delimited JSON, stores one JSON object per line. This export includes an index, the UUID, and its version, making it convenient for streaming-style fixtures, logs, and line-oriented ingestion tools.

Yes. JavaScript array export creates a const uuids = [...] declaration containing the current formatted values. It is useful for test files, seed scripts, and local development examples.

The API payload test replaces {{uuid}}, {{index}}, and {{version}} in a JSON body template, parses every generated body locally, counts malformed payloads, and builds a JSON, cURL, or JavaScript fetch preview. It does not send an HTTP request.

No. The endpoint is treated as example text only. The tool validates JSON and builds a request-shaped preview in browser memory. It does not use fetch, XMLHttpRequest, sendBeacon, or another network request to contact the endpoint.

The JSON body template supports {{uuid}} for the current formatted UUID, {{index}} for a one-based batch index, and {{version}} for the selected version number. Keep UUID placeholders inside JSON strings and index placeholders unquoted when you want a JSON number.

Yes. Choose cURL example or JavaScript fetch example in the local API payload test panel. The preview uses the selected method, endpoint text, headers, and the first valid payload as an example while reporting the number of payloads validated locally.

Each generated body is parsed independently. If JSON parsing fails, the tool reports the affected row and parser message, shows Payload review required, and increments the payload-error count. No request is made and no data is uploaded.

Yes. It compares generated UUID values case-insensitively and reports generated, unique, and duplicate counts. A duplicate within a batch is a review signal; it does not check whether the value exists in an external database.

Generation, formatting, export, JSON validation, preview, copy, and download run locally in browser memory. The tool does not upload UUIDs, call the example endpoint, or store batch history in localStorage or sessionStorage. Avoid pasting production secrets into headers or templates on shared devices.

No. UUIDs are identifiers and should not be treated as passwords, bearer tokens, API keys, session secrets, or encryption keys. Use a dedicated secret-generation and credential-management design for authentication material.

Yes. JSON, CSV, SQL, JavaScript, and newline formats can help prepare fixtures or seed data. Review the selected UUID version, database UUID type, uniqueness constraints, index behavior, quoting, and transaction plan before importing.

Yes. Download export creates a local file with an extension based on the selected format, including .json, .csv, .sql, .js, or .txt. The browser creates the file and does not upload the batch.

Clear removes generated output, payload preview, statistics, and diagnostics from the current interface and returns the status to Waiting. Session history is held only in memory and is not persisted to browser storage.

The bulk page is optimised for volume: large batches with JSON, CSV, and SQL export payloads ready for seeding databases and test fixtures. The regular UUID Generator adds version choice (v1, v4, v5, v7), validation, and decoding for individual identifiers.