Work with your data.
Without uploading it.
Fast browser-based utilities for JSON, CSV, encoding, authentication tokens, text, code formatting, regex and developer workflows. Built for everyday development, data cleanup and troubleshooting.
Explore tools ✓ Core tools process data locallyPractical tools for everyday data work
No account is required. Pick a tool, paste your data, and process it in your browser.
JSON Formatter
Format messy JSON into readable, structured data.
✓JSON Validator
Check JSON syntax and inspect parser errors.
⌘JSON Viewer
Explore nested JSON in a collapsible tree.
✦JSON Beautifier
Pretty-print JSON with adjustable indentation.
↓JSON Minifier
Remove unnecessary whitespace from valid JSON.
→JSON to CSV
Turn JSON records into spreadsheet-friendly CSV.
←CSV to JSON
Convert CSV rows into structured JSON objects.
▦CSV Viewer
Preview CSV data in a clean, scrollable table.
✓CSV Validator
Check headers and row column counts.
SQLCSV to SQL
Generate SQL INSERT statements from CSV.
.*Regex Tester
Test JavaScript regular expressions with highlighting.
◷Timestamp Converter
Convert Unix timestamps and human-readable dates.
IDUUID Generator
Generate random UUID v4 values locally.
64Base64 Encoder / Decoder
Encode and decode UTF-8 text with Base64.
URLURL Encoder / Decoder
Encode and decode URL components.
JWTJWT Decoder
Inspect JWT headers and payload claims.
#Hash Generator
Generate SHA cryptographic hashes locally.
±Text Diff Checker
Compare text and code line by line.
MDMarkdown Preview
Write Markdown and preview common syntax.
Y:JSON ↔ YAML
Convert common JSON and YAML structures.
XMLXML Formatter
Validate and pretty-print XML.
SQLSQL Formatter
Format common SQL queries.
YMLYAML Formatter
Convert and inspect common YAML structures.
<>HTML Entity Encoder
Encode and decode HTML entities.
01Number Base Converter
Convert binary, octal, decimal and hex.
RGBColor Converter
Convert HEX colors to RGB and HSL.
PWPassword Generator
Generate random passwords locally.
RNDRandom String Generator
Create random test strings and IDs.
TXTText Utilities
Count, sort, deduplicate and transform text.
HTTPHTTP Status Lookup
Find common HTTP response codes.
JSONJSON Diff
Compare two formatted JSON documents.
HTMLHTML Minifier
Reduce common HTML whitespace and comments.
CSSCSS Minifier
Minify common CSS syntax.
JSJavaScript Minifier
Basic whitespace and comment minification.
CRONCron Expression Parser
Inspect cron expression fields quickly.
Developer guides
Practical explanations for common developer and data problems, linked directly to the tools that help solve them.
How to Fix Common JSON Syntax Errors
JSON errors are usually caused by a small set of syntax problems. Learn how to find trailing commas, missing quotes, mismatched brackets, and invalid escapes before debugging application code.
JSON vs YAML: When to Use Each Format
JSON and YAML can both represent structured data, but they optimize for different workflows. This guide explains their syntax, readability, interoperability, and common configuration use cases.
Unix Timestamps Explained: Seconds vs Milliseconds
Unix timestamps are common in APIs, databases, logs, and JavaScript applications. The most common source of confusion is whether a value is expressed in seconds or milliseconds.
How to Validate CSV Data Before Import
CSV looks simple but quoting, commas, line breaks, headers, and inconsistent rows can cause import problems. This guide covers structural checks to perform before using a CSV file elsewhere.
How to Debug a Regular Expression
Regex debugging becomes easier when you separate the pattern, flags, test cases, and expected matches. This guide focuses on JavaScript regular expressions.
JWT Basics: Decode vs Verify
JSON Web Tokens are often used in authentication and authorization systems. Decoding a JWT is easy; proving that its claims are trustworthy requires signature verification and application-specific validation.
Base64 Explained: Encoding vs Encryption
Base64 appears in APIs, email formats, data URLs, authorization headers, and many developer workflows. It is frequently misunderstood as a security mechanism.
How to Convert JSON to CSV Correctly
JSON and CSV model data differently. JSON can contain nested objects and arrays, while CSV is fundamentally tabular. This guide explains what to check when converting between them.
Why SQL Formatting Matters
SQL formatting does not change the database execution plan by itself, but readable queries are easier to review, debug, and maintain.
Built for developers, analysts and data-heavy workflows
DataToolBase focuses on small tasks that interrupt development work: checking malformed JSON, inspecting nested API responses, converting CSV, generating SQL, testing regular expressions and translating timestamps.
The core tools are intentionally lightweight. Your browser performs the main operation, and the site does not need a server-side API for ordinary formatting and conversion tasks.
Frequently asked questions
Are these tools free?
Yes. The current tools are available without an account or subscription. The toolbox is designed to cover common developer, data and web utility workflows in one place.
Is my data uploaded?
The core tools are designed to process input locally in the browser. Do not enter highly sensitive information into any future feature unless its data-processing behavior is clearly disclosed.
Can I use the generated output in production?
The tools generate or transform data, but you should review output before using it in production systems, databases or automated workflows.
Will more tools be added?
Yes. The workspace is designed to expand into additional developer, data-cleaning and transformation utilities.