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Install app

If supported, use Install. On Android and desktop, look for Install app in the browser menu. On iPhone/iPad, use Safari → Share → Add to Home Screen. Menu names can vary by browser.

JSON Formatter and Beautifier

Ready

Format compact or single-line JSON with readable indentation. Tidy an API response in your browser and receive a warning when JSON syntax is invalid.

All tools are free to use. File size and processing limits may vary by tool.

How to format?

Paste an API response or config file and format it; copy it into your project. See the JSON Validator for validity checks too.

How are files processed?

Browser tools keep files on your device. Advanced document tools upload files for temporary server processing; the tool shows this before upload. Web lookups send queries to the server and public lookup services.

Practical guide

JSON Formatter

API responses often arrive as compressed single-line strings that are hard to scan. This tool turns dense JSON into indented, readable output entirely in your browser. Spot a missing field or mistyped value within seconds. Do not paste secret keys; replace sensitive values with sample data first.

Read the guide →

Practical articles on this topic

GraphQL vs REST: API Design Choice Guide

GraphQL and REST are two main approaches in modern API design.

API Design Best Practices: RESTful API and Best Practices

A well-designed API directly affects developer experience and application performance.

JSON and Data Formats: Guide for Web Development

JSON (JavaScript Object Notation) is the most common format for data exchange in web applications.

Related tools

JSON Validator

Paste suspicious data and run it; valid syntax earns a confirmation, broken syntax an error warning. Checking happens in this browser, data never reaches a server.

How to validate? Paste the JSON into the box and validate. Valid input returns a confirmation; fix and retry when it fails. Use it on API responses and confi

Base64 Encoder

Convert text into UTF-8 Base64 and copy the encoded result. Processing stays in your browser; Base64 is encoding, not encryption or password protection.

How to encode? Paste the text to encode and run it, then copy the result. Handy for data URIs or carrying binary content in API bodies. Use the Base64 Deco

Base64 Decoder

Decode Base64 or a data URL in your browser. View text, preview recognized images and download the decoded file without uploading the input.

How to decode? Paste Base64 or a data URL, or select a TXT/B64 file containing the code. Decode to view text, preview a recognized image or download the fi

UUID Generator

Generate a standard UUID v4 identifier. Every button press creates a new unique value. It uses the browser cryptographic number generator and sends no request to a server.

How to generate? Press the button and copy the value; use it for database keys, file names and request traces. Collision odds are negligible, yet verify prim

Unix Timestamp Converter

Convert a timestamp into a readable date and a date back into a timestamp. Second and millisecond values are supported. Everything runs in this browser, dates are never stored.

How to convert? Paste a value, pick a direction; the result shows in your local timezone and ISO format. Watch midnight boundaries in daily logs.

Regular expression tester

Regular expression tester. Test JavaScript regular expressions locally.

How to use Test JavaScript regular expressions locally. Maximum 100,000 input characters and 1,000 matches; long matches and capture groups are truncat

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