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Format JSON, encode Base64, generate UUIDs, minify code, and access a full suite of developer utilities.
A toolkit for front-end and back-end developers who need quick conversions, formatting, and encoding without leaving the browser. Useful for debugging API payloads, generating cron expressions, comparing diffs, and minifying assets before deployment. Every tool runs client-side, so your code and data never leave your machine.
Format, validate, and beautify JSON data with syntax highlighting.
Encode and decode text or files to and from Base64 format.
Encode or decode URLs and query parameters for safe transmission.
Encode or decode HTML entities to prevent XSS and display special characters.
Generate random UUIDs (v4) or sequential UUIDs for databases and APIs.
Test and debug regular expressions with real-time matching and syntax help.
Minify CSS code to reduce file size and improve page load speed.
Minify JavaScript code by removing whitespace, comments, and shortening variables.
Minify HTML code by removing unnecessary whitespace and comments.
Format and beautify SQL queries for better readability and debugging.
Convert JSON arrays to CSV format for spreadsheet import.
Convert CSV data to JSON format for API consumption.
Convert JSON data to XML format with configurable options.
Convert XML documents to JSON format for modern applications.
Convert YAML configuration files to JSON format.
Convert JSON data to YAML format for configuration files.
Write and preview Markdown with live rendering and syntax highlighting.
Build and validate cron expressions with a human-readable schedule preview.
Convert hex color codes to RGB, HSL, and other color formats.
Pick colors and get hex, RGB, HSL values with a visual color wheel.
Convert Unix timestamps to human-readable dates and vice versa.
Decode and inspect JSON Web Token payloads and headers.
Convert HTML code to clean Markdown format.
Convert Markdown text to clean HTML code.
Create beautiful CSS gradients with a visual editor and copy the code.
Design CSS box shadows visually and copy the generated code.
Calculate Unix file permissions in symbolic and numeric notation.
Look up geolocation, ISP, and other details for any IP address.
Parse user agent strings to identify browser, OS, and device details.
Compare two blocks of text or code and highlight the differences.
ToolPeg's developer tools focus on quick browser-side utility work such as formatting, encoding, generating identifiers, and testing small code or data transformations.
They are useful when you want immediate feedback during debugging, API work, or documentation tasks without switching to a heavier local setup.
Popular picks in this category include JSON Formatter, Base64 Encoder, UUID Generator, and JWT Decoder.
Format, validate, and beautify JSON data with syntax highlighting.
Encode and decode text or files to and from Base64 format.
Generate random UUIDs (v4) or sequential UUIDs for databases and APIs.
Decode and inspect JSON Web Token payloads and headers.
Use these utilities for speed, but still validate production-critical data against your schema, application logic, and deployment environment.
Curated guides, glossaries, and comparisons for this category's key workflows.
Choose the right developer utility for API payload formatting, Base64 inspection, UUID generation, and other quick debugging tasks in the browser.
A plain-English glossary page explaining JSON formatting, pretty-printing, and why readable structured data matters during debugging and API work.
Learn what Base64 encoding does, why developers use it for transport and embedding, and why it should not be confused with encryption.