Developer Tools
JSON Formatter
Format JSON with readable indentation.
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Format, validate, inspect, and generate developer data formats in seconds.
40 tools in this category.
Developer Tools
JSON Minifier
Minify JSON by removing extra whitespace.
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JSON Validator
Validate JSON input and return syntax status.
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UUID Generator
Generate UUID v4 values instantly.
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Base64 Encode / Decode
Encode plain text to Base64 or decode Base64 text.
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Unix Timestamp Converter
Convert Unix timestamps to readable dates and back.
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HTML Formatter
Format HTML into a readable structure.
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HTML Minifier
Minify HTML by removing unnecessary spaces.
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CSS Minifier
Minify CSS for smaller payload size.
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CSS Formatter
Format CSS with consistent spacing and line breaks.
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JS Minifier
Minify JavaScript for compact output.
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URL Encoder
Encode URLs and query values safely.
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URL Decoder
Decode URL-encoded text instantly.
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Query String Parser
Parse query strings into JSON key-value data.
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Query String Builder
Build query strings from key-value input.
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JWT Decoder
Decode JWT header and payload without signature verification.
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Regex Tester
Test regular expressions and inspect live matches.
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Hash Generator
Generate MD5, SHA1, or SHA256 hashes from text.
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HTTP Header Parser
Parse raw HTTP headers into structured JSON.
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CSS to JS Object Converter
Convert CSS declarations into JavaScript style objects.
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JS Beautifier
Format JavaScript code with clean indentation.
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JS Obfuscator
Obfuscate JavaScript source for basic readability protection.
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HTML to Markdown Converter
Convert HTML blocks into Markdown syntax.
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Markdown to HTML Converter
Convert Markdown text to clean HTML output.
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Markdown Preview
Preview rendered HTML output from Markdown content.
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SQL Formatter
Format SQL queries for readability.
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XML Formatter
Format XML with consistent indentation.
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XML Validator
Validate XML syntax and structure.
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YAML Formatter
Format YAML with normalized spacing.
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YAML Validator
Validate YAML formatting rules.
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JSON Diff Checker
Compare two JSON objects and show differences.
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JSON Escape / Unescape
Escape or unescape JSON-safe string content.
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HTML Escape / Unescape
Escape or unescape HTML entities quickly.
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URL Parser
Parse a URL into protocol, host, path, and params.
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URL Slug Validator
Check if text is a valid URL slug.
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User Agent Parser
Parse user-agent strings into readable device data.
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IP Address Lookup
Inspect IP type, version, and reserved/private ranges.
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JWT Generator
Generate unsigned JWT tokens from header and payload JSON.
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HMAC Generator
Generate deterministic HMAC-style hashes from key and message.
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Checksum Generator
Generate file and text checksums for quick integrity checks.
Open toolCategory Guide
Developer Tools on ToolHarbor focus on daily engineering workflows: parsing payloads, validating data, generating identifiers, and inspecting common protocol formats directly in the browser.
Build faster debugging workflows
This category helps developers remove repetitive friction from API, frontend, and backend tasks. Instead of installing one-off desktop utilities, you can open a focused page, run one task, and copy output instantly. Typical usage includes validating JSON before a deploy, formatting payloads for logs, parsing query strings, and generating secure tokens for testing.
Designed for practical engineering use
Each tool page combines UI controls, clear input/output areas, and examples that map to real developer scenarios. The goal is not novelty, but reliable utility: when a teammate asks for a quick diff, checksum, JWT payload, or encoded URL, you can get the result in seconds without context switching across apps.
SEO and topical cluster strength
As a cluster, Developer Tools pages target high-intent queries around formatting, parsing, validation, and code utilities. Internal links connect related jobs so users can continue workflows naturally and search engines can understand topical depth across the entire developer tooling section.
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FAQ
Are these developer tools free to use?
Yes. All developer tools on ToolHarbor are free and available without signup.
Can I use these tools on mobile?
Yes. Category pages and tool pages are optimized for modern mobile and desktop browsers.
Does ToolHarbor include related links between tools?
Yes. Every tool page includes related links so you can continue multi-step workflows quickly.