Developer tools

Free in-browser developer utilities. Convert JSON, YAML, and CSV; format JSON; encode and decode JWTs — nothing is uploaded.

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Converters

JSON to YAML

Free JSON to YAML converter in your browser. Paste or drop a file — nothing is uploaded.

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JSON to CSV

Free JSON to CSV converter in your browser. Paste or drop a file — nothing is uploaded.

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YAML to JSON

Free YAML to JSON converter in your browser. Paste or drop a file — nothing is uploaded.

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YAML to CSV

Free YAML to CSV converter in your browser. Paste or drop a file — nothing is uploaded.

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CSV to JSON

Free CSV to JSON converter in your browser. Paste or drop a file — nothing is uploaded.

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CSV to YAML

Free CSV to YAML converter in your browser. Paste or drop a file — nothing is uploaded.

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Code generators

JSON to TypeScript converter

Convert JSON to TypeScript interfaces in your browser. Paste or drop a file — nothing is uploaded.

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JSON to Java converter

Convert JSON to Java classes with getters and setters in your browser. Paste or drop a file — nothing is uploaded.

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JSON to Kotlin converter

Convert JSON to Kotlin data classes in your browser. Paste or drop a file — nothing is uploaded.

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Formatters

JSON Formatter

Pretty-print and validate JSON in your browser. Paste or drop a file — nothing is uploaded.

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JSON Minifier

Minify JSON in your browser. Strip whitespace and validate — files stay on your device.

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JSON Uglify

Uglify JSON in your browser. Mangle object keys into short names, compact the payload — files stay on your device.

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JSON to Image

Make a shareable PNG or JPG from JSON in your browser — styled code window, local canvas export, nothing uploaded.

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JSON to PNG converter

Export JSON as a crisp PNG in your browser — sharp text, optional transparent pad, no upload. Built for docs, PRs, and slides.

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JSON to JPG converter

Export JSON as a JPG in your browser — compact opaque stills for email and CMS uploads. Nothing leaves this device.

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JWT

JWT Decoder

Decode and inspect JWTs in your browser. Edit claims, verify HMAC signatures — nothing is uploaded.

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JWT Encoder

Create and sign JWTs in your browser. Edit header and payload, sign with an HMAC secret — files stay on your device.

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In-browser utilities

Developer tools on Formatly run entirely in your browser. Convert JSON, YAML, and CSV, generate TypeScript, Java, or Kotlin from JSON, export JSON as PNG or JPG, format, minify, and uglify JSON, or encode and decode JWTs — nothing is uploaded and no account is required.

Prefer images? Use the image converter. Read how local processing works on security.

Converters

Code generators

JSON to image

Formatters