Does this support GraphQL queries?

Yes. You can send GraphQL queries or mutations by selecting POST and providing a query body.

Can I add headers or authentication?

Yes. You can add any custom headers and choose authentication options like Bearer tokens, Basic Auth, or API keys.

Is my request data stored?

No. All requests are executed locally in your browser. Data is never stored on our servers.

Toolzium

API Tester

Build requests, send, inspect responses — all in your browser.

Request

Configure method, URL, params, headers, auth, and body.

Method

Query Params

Headers

Auth

Body

Timeout (ms)

Follow redirects

Response

Status, time, size, headers and body preview.

— — —

Headers

—

Body

Presets

Save and reuse frequent requests.

No presets yet. Click Save Preset to store the current request.

History

Recent requests (stored locally).

No history yet.

Hash Generator

Generate MD5, SHA1, SHA256, SHA512, and other cryptographic hashes online. Hash text, files, and pas…

JSON Formatter

Format, validate, and beautify JSON data online. JSON pretty printer with syntax highlighting, error…

Diff Checker

Compare two text files and find differences line-by-line. Text diff tool with syntax highlighting fo…

Regex Library

Collection of useful regular expression patterns for email, URL, phone, credit card validation, and …

UUID / NanoID Generator

Generate unique UUIDs (v4), NanoIDs, and short IDs online. Create universally unique identifiers for…

HTML to Markdown Converter

Convert HTML to Markdown and Markdown to HTML instantly. Supports headings, links, images, lists, ta…