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json-schema.org
JSON Schema is a declarative language for annotating and validating JSON documents' structure, constraints, and data types. It enables JSON data consistency, validity, and interoperability, and has a tooling ecosystem of validators, generators, and linters. Documentation covers schema design, guides, and keyword reference.
spritesheetgenerator.online
Spritesheet Generator is a free browser-based tool for building sprite sheets for game development. Users upload sprite images or a JSON atlas, arrange frames in a grid, preview animations at adjustable frame rates, and export as PNG, JSON, ZIP or GIF. It includes a pixel editor, recolor controls and an atlas packer. The site states images stay on the user's machine and the tool works offline.
fakenamegenerator.com
A generator that produces random, fictional identities including names, addresses, phone numbers, emails, usernames and passwords, described for software testing, sample data and writing. It is free and needs no account; signing in allows saving identities, bulk orders and API use. An API returns identities as JSON repeatable with a seed.
tableconvert.com
TableConvert is a free online table converter and data generator tool. It supports conversion between more than 30 formats, including Excel, CSV, JSON, Markdown, LaTeX and SQL. The site also offers an online table editor, a table generator, web page table extraction and a Chrome extension.
encodedna.com
EncodeDna.com is a developer resource offering online tools, tutorials, guides and articles on web development topics such as Python, Node.js, JavaScript, Angular, CSS and color theory. Its browser-based tools include an image viewer, HTML minifier, image cropper, color palette generator, JSON validator and notepad. Articles are described as new regularly and free for ever.
createfeed.fivefilters.org
Feed Creator is a web tool from FiveFilters.org that turns webpages into custom RSS and JSON feeds from selected items or links on a page. It finds selectors automatically so feeds update with new items, and offers alerts, full-text expansion, and filtering by words or URL patterns. The hosted service is now part of Feed Control.
emn178.github.io
Online Tools is a collection of free browser-based utilities for hashing, encoding, encryption, formatting, compression, file processing, QR codes, UUIDs, JSON and XML. The page groups tools under categories including hash, cryptography, compression, encoding, format conversion and generators.
sfxr.me
jsfxr is a simple online 8-bit sound maker and sound effects generator that runs in the browser. It offers settings for envelope, frequency, vibrato, arpeggiation and filters, and sounds can be downloaded as WAV files or saved as JSON. It can also serve as a sound library in JavaScript games.