devwrench

Free browser-based
developer tools.

Fast online utilities for JSON, SQL, text, encoders, generators, converters and API workflows.
No accounts. No uploads. No telemetry. Everything runs entirely in your browser.

30 live tools7 categoriesno trackingruns in browser

Most used

cURL to FetchUUID GeneratorJSON FormatterJSON to TypeScriptSQL FormatterBase64 Encoder

Browse by category

Jump into a part of the toolbox faster. Each category groups related tools for common developer workflows like JSON inspection, SQL formatting, text cleanup and encoding.

JSON

6

Inspect, format, transform and extract structured JSON data.

JSON Diff ViewerJSON FormatterJSON Key Extractor
View JSON tools →

SQL

3

Format queries and convert between SQL and JSON structures.

JSON to SQLSQL FormatterSQL to JSON
View SQL tools →

Text

6

Clean, sort, compare and transform plain text quickly.

Case ConverterEmail ValidatorMarkdown Preview
View Text tools →

Encoders

3

Encode and decode Base64, URLs, HTML entities and more.

Base64 Encoder / DecoderHTML Encoder / DecoderURL Encoder / Decoder
View Encoders tools →

Generators

3

Generate UUIDs, hashes, random strings and developer utilities.

Hash GeneratorRandom String GeneratorUUID Generator
View Generators tools →

API

5

Work with cURL, JWTs, timestamps and request-oriented helpers.

cURL to FetchJWT DecoderQuery String to JSON
View API tools →

Converters

4

Convert between formats like CSV, YAML, CSS units and more.

CSS Unit ConverterCSV to JSONJSON to YAML
View Converters tools →

Available tools

30
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Other developer resources

HTTPRef

→

Looking for HTTP status codes, headers and MIME types? Use HTTPRef for quick browser-based HTTP reference.

CSSRef

→

Need a CSS reference? Explore CSSRef for selectors, properties, values and practical CSS lookup.

Popular workflows

JSON inspection and transformation

Format JSON, extract nested key paths, convert to CSV, generate TypeScript interfaces and move between JSON, YAML and SQL structures.

Text cleanup and encoding

Sort lines, remove duplicates, convert text case, generate slugs and work with Base64, URLs and HTML entities directly in the browser.

Frequently asked questions

What is DevWrench?

DevWrench is a collection of free browser-based developer tools for JSON, SQL, text, encoding and API workflows. Everything runs locally in your browser.

Is DevWrench free?

Yes. All tools are free to use with no accounts, no sign-up and no usage limits.

How do I convert a cURL command to JavaScript fetch?

Use the cURL to Fetch tool. Paste your cURL command and it generates the equivalent JavaScript fetch() code instantly.

Open cURL to Fetch →

How do I format JSON online?

Use the JSON Formatter tool. Paste your JSON and it validates, formats and beautifies it instantly.

Open JSON Formatter →

How do I generate a UUID online?

Use the UUID Generator tool. It generates UUID v4 values instantly using browser crypto — no server needed.

Open UUID Generator →

Is my data safe when using DevWrench?

Yes. All processing happens locally in your browser. Your data is never uploaded to a server.

Browser-based developer tools

DevWrench offers free browser-based developer tools for common JSON, SQL, text, encoding, conversion and API workflows. Use it to inspect payloads, transform data, clean text, format code and generate developer-friendly output without accounts or setup.

  • Format and transform structured data with tools for JSON, YAML, CSV and TypeScript workflows.
  • Work faster with SQL tools for formatting queries and converting between SQL and JSON structures.
  • Clean and process text with utilities for sorting lines, removing duplicates, converting case and generating slugs.
  • Encode, decode and inspect data with browser-based tools for Base64, URLs, HTML entities and query strings.
  • Generate useful development output such as UUIDs, hashes, random strings and extracted JSON key paths.