Browse 79 Tools

Developer Tools

JSON & XML formatters, validators, Base64 converters, code minifiers, SQL formatters, and regex utilities.

Available Developer Tools

Showing all 20 tools in this category.

Runs in your browser
JSON Formatter
Beautify, indent, and format JSON strings instantly.
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JSON Validator
Validate JSON syntax with exact error line numbers.
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Base64 Encoder / Decoder
Convert text and files to and from Base64 format.
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UUID Generator
Generate cryptographically secure UUID v4 / GUIDs.
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JSON Minifier
Compress and minify JSON data to a single compact line.
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XML Formatter
Beautify, indent, and format XML documents instantly.
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XML Validator
Validate XML syntax for well-formedness and syntax errors.
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URL Encoder / Decoder
Percent-encode and decode URLs and URI parameters.
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HTML Formatter
Beautify, indent, and format HTML code cleanly.
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CSS Minifier
Minify and compress CSS stylesheets to boost page speed.
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SQL Formatter
Beautify, indent, and format SQL queries cleanly.
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Regex Tester
Test and debug regular expressions with live match highlighting.
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JSON Compare
Compare two JSON documents with deep structural diff and JSON path inspection.
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CSV Compare
Compare two CSV files or tables with row-by-row and key-based diff matching.
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JWT Debugger
Decode JWT tokens, inspect claims, and check expiry status — 100% client-side.
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YAML to JSON Converter
Convert YAML to JSON and JSON to YAML instantly — supports Kubernetes, Docker, CI/CD configs.
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cURL to Code Converter
Convert curl commands to JS fetch, C# HttpClient, Python requests, and Node Axios.
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Cron Expression Builder
Build cron expressions visually and explain them in plain English with next run times.
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Hash & Checksum Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text and files — 100% local.
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JSON to C# Class / Record Generator
Convert JSON into idiomatic C# records and classes with System.Text.Json attributes.
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Which Developer Tools Should I Use?

Quick reference guide to help you choose the right utility for your workflow.

Tool Best For Supported Formats / Inputs Execution & Privacy
JSON Formatter Beautifying and indenting minified JSON data payloads JSON string / file Runs 100% in your browser
JSON Validator Syntactic validation and RFC 8259 error diagnosis JSON string / file Runs 100% in your browser
JSON Minifier Stripping whitespace from JSON for compact production payloads JSON string Runs 100% in your browser
XML Formatter Structuring, indenting, and beautifying hierarchical XML markup XML string / file Runs 100% in your browser
XML Validator Checking well-formedness and syntax of XML documents XML string Runs 100% in your browser
Base64 Tool Encoding and decoding text, tokens, and binary assets Plaintext / Base64 / Files Runs 100% in your browser
URL Encoder/Decoder Escaping URI components and decoding percent-encoded query params URL strings Runs 100% in your browser
JWT Debugger Decoding and inspecting JSON Web Token headers, payloads, and expiry JWT string (3-part token) Runs 100% in your browser
YAML to JSON Bidirectional conversion between YAML configs and JSON schemas YAML / JSON Runs 100% in your browser
cURL to Code Translating cURL requests into Python, JavaScript, Go, and C# cURL command string Runs 100% in your browser
Cron Builder Visual cron schedule creation with plain-English next run times Cron expression / Visual UI Runs 100% in your browser
Hash Generator Cryptographic checksums (MD5, SHA-1, SHA-256, SHA-512) for text and files Text / Binary files Runs 100% in your browser
UUID Generator Generating cryptographically random RFC 4122 v4 UUID identifiers Count & formatting options Runs 100% in your browser
JSON Compare Structural semantic comparison highlighting added, removed, or changed keys Two JSON payloads Runs 100% in your browser
CSV Compare Side-by-side row and column diffing of tabular CSV data Two CSV files / strings Runs 100% in your browser
HTML Formatter Beautifying and indenting messy HTML markup cleanly HTML markup Runs 100% in your browser
CSS Minifier Compressing stylesheets to reduce render-blocking web payloads CSS code Runs 100% in your browser
SQL Formatter Formatting complex SQL queries with casing and clause alignment SQL query strings Runs 100% in your browser
Regex Tester Testing regular expressions with live highlighting and group extraction Regex pattern & test string Runs 100% in your browser

Fast, Secure Utilities for Software Engineers & DevOps

Modern software engineering requires continuous inspection and transformation of structured data payloads, configuration files, authentication tokens, and query strings. When debugging production REST APIs, diagnosing JWT claims, or beautifying minified database queries, developers need tools that provide zero-latency results while honoring strict code confidentiality standards.

Pasting proprietary company data, JSON web tokens containing internal user identifiers, or SQL database schemas into untrusted cloud web utilities is a critical security vulnerability. Many online formatters log submitted payloads to telemetry servers or third-party analytics trackers, exposing credentials and internal architecture.

FreeDailyTools Developer Tools are built with a workstation-first security model. Formatters, validators, converters, and debugging utilities execute 100% on the client side in your browser's local sandbox. Whether you are generating cryptographic hashes with the native Web Crypto API, evaluating complex regular expressions, or converting cURL commands to idiomatic Python or Node.js code, nothing is transmitted externally.

Designed with clean keyboard shortcuts, one-click clipboard copying, and dark-mode support, our developer hub accelerates daily development workflows without interrupting your flow or compromising enterprise compliance.

Frequently Asked Questions

Are API keys or JWT tokens safe to paste into these developer tools?

Yes. Our developer tools execute 100% in your browser's local JavaScript environment. No payloads, tokens, or queries are ever sent to our servers or logged.

Do the formatters work offline?

Once loaded in your browser, all client-side developer utilities can continue functioning without an active internet connection.

Can I format large JSON and XML files?

Yes. The tools handle multi-megabyte payloads smoothly using native browser parsing engines.

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Chronological tools for countdown timers, time zone conversions, date differences, and timestamps.

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Free online generators for custom QR codes, secure passwords, URL slugs, meta tags, and digital signatures.