Insomnia JWT Encoder Plugin

Generate JWT tokens with both symmetric (HMAC) and asymmetric (RSA/ECDSA) algorithms directly in Insomnia.

Informations

It's a simple code that uses jwt.sign() to encode information. Nothing will be saved on the web; everything will run locally on your computer. You can see the code in my github: https://github.com/lorenzomlazzarin/insomnia-plugin-jwt-encoder

Algorithms

• 🔐 Asymmetric JWT: Generate JWTs using RSA and ECDSA algorithms

  • RS256, RS384, RS512 (RSA with SHA)
  • ES256, ES384, ES512 (ECDSA)
  • PS256, PS384, PS512 (RSA-PSS)

• 🔑 Symmetric JWT: Generate JWTs using HMAC algorithms

  • HS256, HS384, HS512

Installation

1. Open Insomnia
2. Go to Application > Preferences > Plugins
3. Search for insomnia-plugin-jwt-encoder
4. Click Install

Usage

Getting Started

1. In any Insomnia request field (URL, headers, body, etc.)
2. Press Ctrl + Space to open the template tag selector
3. Search for "JWT" to find the JWT template tags
4. Choose between:
   • 🔐 JWT Asymmetric - for RS/ES/PS
   • 🔑 JWT Symmetric - for HS

not showing the options

To add information

when you select any option, a tag (blue box) will appear and the text "JWT" ​​will disappear:

After that, you need to click on the tag, and a box will appear. The information you need to enter depends on the chosen algorithm. The tag indicates the selected algorithm type. Note the letters and numbers written in the tag encode JWT => xxxxx, where xxxxx is one of the algorithms described in the Features section.

Asymmetric JWT

1. check the algorithm selected. i can't find algorithm
2. Add any additional fields you want in the header, in addition to alg and typ. If you don't add anything, it will only be the two fields.
3. Set expiration time (e.g., "1h", "30m", "7d")
4. Add your payload (JSON format), without the exp attribute
5. Specify path to your private key file (.pem)

Exemple:

without custom headers

with custom headers

Symmetric JWT

1. check the algorithm selected. i can't find algorithm
2. Add any additional fields you want in the header, in addition to alg and typ. If you don't add anything, it will only be the two fields.
3. Set expiration time (e.g., "1h", "30m", "7d")
4. Add your payload (JSON format), without the "exp" attribute
5. Enter your secret key (string or Base64) (Auto-detect Base64 encoded secrets)

Important

1. Only the header section is optional.
2. You can put this tag in any tab of insomnia.
3. You can only see the algorithm options for the type you are using. If you are using asymmetric algorithms and want to switch to symmetric algorithms, change the function to perform option.
4. If any important information is missing, the "Live Preview" section will display messages for you.

Possible problems

don't appear options:

Look in the Application > Preferences > Plugins if insomnia-plugin-jwt-encoder appears in the section Plugins with green check.

can't find the algorithm:

Please, look the 3° tópic of Important.