DeveloperFree Tool

SQL Playground

Provided byDevBoltdevbolt.dev

Runs SQL queries against a WebAssembly SQLite database — JOINs, CTEs, window functions, aggregations.

Use This Tool

browser-based privacy-focused devbolt

Screenshot of SQL Playground on DevBolt — devbolt.devOpen the live tool →

About this tool

Runs SQL queries against a WebAssembly SQLite database — JOINs, CTEs, window functions, aggregations.

Keep Exploring

Similar tools

Based on shared tags

.gitignore Generator7 options

The .gitignore Generator is a free online tool to create standard .gitignore files for your project language and IDE. It supports many languages, frameworks, editors, and OS presets and lets you preview and download the result. ([rootutils.com](https://rootutils.com/tools/gitignore-generator))

7 options

💻 Developer

Password Generator7 options

A random password generator to create strong and secure passwords. To ensure security, they are generated on the webpage without being sent over the internet.

7 options🛡️ Security

Aspect Ratio Calculator3 options

Calculates aspect ratios for images, videos, and other rectangular objects by inputting width and height measurements or selecting from pre-defined formats. Users can quickly determine if files need resizing to fit specific dimensions or screen sizes without manual calculations. Photographers, videographers, graphic designers, and anyone working with visual content will find this tool useful for ensuring that their projects maintain the correct aspect ratio for display on various devices, adhering to standards like 16:9 for TVs or 4:3 for older monitors.

3 options📷 Photography & Video

HTML Entity Encoder3 options

Developers and web designers often need to convert special characters into their corresponding HTML entities to ensure proper rendering across different browsers. HTML Entity Encoder provides a reliable method to transform sensitive characters—such as angle brackets, ampersands, and quotes—into standardized code that prevents browsers from misinterpreting them as functional HTML tags. This process is essential for anyone looking to display raw code snippets on a webpage or securely manage user input within a web application. The utility also integrates XSS prevention analysis, offering insights into how specific encoding choices contribute to site security. By substituting potentially malicious characters with safe entities, it helps mitigate the risk of cross-site scripting attacks that target vulnerabilities in data handling. Users can switch between encoding and decoding functions to verify their data or restore entities to their original plaintext format for editing and review.

3 options🔐 Encoders & Decoders

Case converter5 options

Converts text between different cases such as lowercase, uppercase, title case, and sentence case. Users simply input their text and select the desired case conversion from the options provided. Ideal for anyone needing to standardize text formatting for readability or compatibility purposes.

5 options📝 Text & Encoding

JWT Decoder2 options

Decodes JSON Web Tokens to reveal their contents, offering security validation for authenticity and integrity checks. Users can analyze JWTs by pasting them into the tool's interface, which then breaks down the token into its header, payload, and signature components. This analysis helps identify potential vulnerabilities or tampering. Developers, system administrators, and anyone dealing with secure communications that rely on JWTs would use this tool to debug authentication issues, ensure data integrity, or validate tokens in development environments.

2 options🛡️ Security