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Toolvica

Developer

Free online developer tools for JSON formatting, CSV/JSON/XML conversion, and Base64 encoding. Format, validate, minify, and convert your data with real-time processing — all in your browser.

JSON Formatter & ValidatorFormat, validate, and minify JSON data with real-time error detection and copy-to-clipboard.
CSV to JSON ConverterConvert CSV and TSV files to JSON format with parsing options, transpose support, and multiple output modes.
JSON to CSV ConverterConvert JSON data to CSV, TSV, and other formats with support for nested structures and multiple output modes.
XML to JSON ConverterConvert XML files and data to JSON format with real-time validation and parsing. All processing happens in your browser.
JSON to XML ConverterConvert JSON files and data to XML format with real-time validation and parsing. All processing happens in your browser.
Base64 Encoder & DecoderEncode text and files to Base64 or decode Base64 strings back to original text with URL-safe mode and file support.
JWT DebuggerDecode, verify, and create JSON Web Tokens with signature verification for HS256, RS256, ES256, and more. All processing happens in your browser.
SQL Query Formatter & ExplainerFormat and beautify SQL queries for MySQL, PostgreSQL, SQLite, and more, with plain-language explanations of every clause. All processing happens in your browser.
Cron Expression BuilderBuild cron expressions visually, read any 5-field cron in plain English, and compare next run times across timezones. All processing happens in your browser.
Regex Generator & TesterTest regular expressions with real-time highlighting, generate regex from plain-English descriptions, view capture groups and match positions. All processing happens in your browser.

About Developer Tools

Toolvica's developer tools handle everyday coding tasks with speed and precision. Convert CSV data to structured JSON, format and validate JSON in real time, or encode and decode Base64 strings with URL-safe mode and file support. All tools work entirely in your browser — no data leaves your machine, no sign-up needed, and no usage limits.

Frequently Asked Questions

How does the JSON Formatter work?

Paste or type your JSON into the editor and click Format to indent and structure it. The validator checks for syntax errors in real time, highlighting issues as you type. You can also minify JSON to save space.

What is Base64 encoding used for?

Base64 encodes binary data into ASCII text, commonly used for embedding images in HTML/CSS, transmitting data in URLs, email attachments (MIME), storing binary in JSON, and API authentication headers.

Can I validate JSON without an internet connection?

Yes. The JSON Formatter & Validator runs entirely in your browser with no server dependency. Paste or type JSON, and validation, formatting, and error highlighting all work offline after the page is loaded.