FormatForge Collections
Free API developer tools for JSON formatting, JWT decoding, JSON Schema generation, JSONPath testing, API response debugging and data conversion workflows.
Format, validate, beautify and inspect JSON for API debugging.
Decode JWT header, payload, expiry and token claims online.
Generate JSON Schema from sample JSON for API validation.
Test JSONPath queries and extract values from nested JSON.
Convert API JSON responses into Excel spreadsheets.
Convert JSON arrays and API responses into CSV format.
Use JSON Studio to format and validate API responses, JWT Decoder to inspect authentication tokens, JSON Schema Generator to create schema validation rules and JSONPath Explorer to extract values from nested response payloads.
API developer tools help developers format JSON, decode tokens, generate schemas, test JSON paths and debug API responses.
Yes. FormatForge API tools are free to use online.
Most FormatForge developer tools process data locally in the browser and do not upload pasted data to a server.
Use JSON Studio to format and validate API responses, JSONPath Explorer to query nested fields, and JSON Schema Generator to create validation schemas.
Choose with confidence
Start with the outcome you need, use the smallest suitable tool, and verify the downloaded or copied result before relying on it. The guidance below helps turn individual utilities into a reliable workflow.
Start here
Decode a JWT to read claims without treating it as signature verification.
Open recommended tool →Encode URLs or Base64 values only when the target protocol requires it.
Open recommended tool →Before you finish
Recommended workflows
Continue your workflow
