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Free Online Developer Tools

Privacy-friendly utilities for developers — test regex, format JSON, encode Base64, generate UUIDs, decode JWT tokens, and more.

JSON Formatter

Validate and pretty-print JSON locally in your browser.

Regex Tester

Test regular expressions and instantly highlight matches in your text.
Data & Conversion Token & Pattern Debugging HTTP & Infrastructure Checks SEO: Audit + Keyword Frequency

Data & Conversion

7 tools

Encoding, formatting, hashing and structured data conversions for day-to-day development tasks.

Base64 Encode/Decode

Convert text to/from Base64 instantly — runs locally in your browser.

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Hash Generator

Create SHA-256, SHA-1 and MD5 hashes client-side for quick integrity checks.

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UUID Generator

Generate RFC4122 UUID v4 identifiers and copy with one click.

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URL Encoder/Decoder

Encode query params safely or decode percent-encoded strings.

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JSON Formatter

Pretty-print, minify and validate JSON locally in your browser.

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Timestamp Converter

Convert Unix time ↔ human-readable date with timezone/ISO output.

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CSV ↔ JSON Converter

Convert CSV to JSON or JSON to CSV with delimiter options.

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Token & Pattern Debugging

3 tools

Focused tools to inspect JWT payloads, test regex behavior, and verify webhook signatures quickly.

JWT Decoder

Decode JWT tokens and view header & payload JSON — runs locally.

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Regex Tester

Test regular expressions and instantly highlight matches in your text.

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Webhook Signature Generator/Verifier

Generate and verify HMAC webhook signatures from payload + secret.

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HTTP & Infrastructure Checks

7 tools

Endpoint diagnostics, header and redirect analysis, cron readability, robots/sitemap checks and visual snapshots.

SEO Audit

Audit core on-page SEO signals with low-load crawl limits and clear recommendations.

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Word Frequency Analyzer

Analyze webpage keyword frequency and density with optional English stop-word filtering.

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HTTP Header Inspector

Inspect status, redirects, headers, and security/caching signals for a URL.

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Cron Expression Humanizer

Convert cron schedules into readable language and validate expression syntax.

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Robots.txt + Sitemap Validator

Validate robots.txt and sitemap XML setup, including nested sitemap indexes.

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Redirect Chain Visualizer

Trace every redirect hop with status, timing and resolved Location target.

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Website Link Checker

Crawl pages with strict limits and detect broken internal or external links.

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Developer utilities in one place

Whether you need to generate unique identifiers, encode data in Base64, test a regex pattern, or decode JWT tokens, our developer hub provides fast, lightweight tools.

Many of these run entirely client-side — nothing leaves your browser. Safe, fast, and always free.

Developer Tools FAQ

Are these tools free to use? ＋

Yes, all developer tools on toWorthy are completely free and available without registration.

Is my data stored anywhere? ＋

No. Most tools (like JSON formatter, Base64 encoder, Regex tester) run fully in your browser. Nothing is uploaded to our servers.

What can I do with the JSON formatter? ＋

You can validate, pretty-print, and minify JSON. It helps quickly debug APIs or configs.

Is Base64 the same as encryption? ＋

No. Base64 only encodes data for safe text transmission. It can be easily decoded back.

What is a UUID generator used for? ＋

UUIDs provide unique identifiers for databases, systems, and distributed apps. They reduce the risk of collisions compared to sequential IDs.

Can I test Regex safely here? ＋

Yes. The Regex tester highlights matches in real time, directly in your browser, without sharing your text externally.