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Developer Tools

Utilities for formatting, checking, converting, and inspecting development data.

Tool collection

Available tools

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Featured

JSON Formatter

Format, validate, and minify JSON online with this free JSON formatter. Make compact JSON easier to read, choose your indentation style, sort object keys, and download the result.

JSON Validator

Check whether your JSON is correctly formatted and ready to use. Paste your data, enter it manually, or upload a .json file to detect syntax errors. You can also provide a JSON Schema to check whether your data follows common structural and value rules.

JSON Minifier

Minify JSON online by removing unnecessary formatting whitespace. Make JSON text more compact, check its syntax before minifying, and optionally sort object keys. View the size reduction, then copy or download the result.

JSON ↔ CSV Converter

Choose a delimiter, work with column headers, flatten nested JSON objects, and preview your data before copying or downloading the result.

JSON ↔ YAML Converter

Convert JSON to YAML or YAML to JSON with an online converter. Validate your input, identify parsing errors, adjust indentation and formatting, sort mapping keys, and copy or download the converted result.

Base64 Encoder / Decoder

Encode text and files to Base64 or decode Base64 data back into readable text or downloadable files. This online Base64 encoder and decoder supports UTF-8 text, URL-safe Base64, optional padding removal, and configurable output line wrapping.

URL Encoder / Decoder

Encode or decode text, URL components, and form values with this free online URL Encoder / Decoder. You can also parse query parameters, edit parameter values, and build an updated URL. Convert text as you type or manually, then copy or download the result.

HTML Encoder / Decoder

Convert special characters into HTML entities or decode HTML entities back into readable text. Encode or decode manually or as you type, preserve existing entities, convert non-ASCII characters, and process nested entities with up to five decoding passes.

Featured

UUID Generator

Generate random UUID v4 identifiers suitable for unique keys, test records, and identifiers.

JWT Encoder/Decoder

Decode JWTs, inspect claims, verify HMAC signatures, and generate signed test tokens with HS256, HS384, or HS512.

Regex Tester

Test and debug JavaScript regular expressions. Highlight live matches, inspect capture groups and positions, and preview JavaScript replacements.

Timestamp Converter

Convert Unix timestamps into readable dates, or convert a date and time into a Unix timestamp. This free online Unix Timestamp Converter supports seconds and milliseconds, displays UTC and selected-timezone results, and updates automatically as you change the input.